<?xml version="1.0" encoding="UTF-8"?>
<!-- Prepared by IBM Cognos Disclosure Management XBRL Version: 10.2.4 Using Fujitsu -->
<!-- Validation status: Passed -->
<linkbase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/instance http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xbrldt="http://xbrl.org/2005/xbrldt">
    <roleRef roleURI="http://www.comcast.com/role/AccountingPolicies" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_AccountingPolicies" />
    <roleRef roleURI="http://www.comcast.com/role/CommitmentsAndContingenciesInsuranceObligationsDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_CommitmentsAndContingenciesInsuranceObligationsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/CommitmentsAndContingenciesMinimumAnnualCommitmentsUnderTheProgrammingLicenseAgreementsAndOperatingLeasesDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_CommitmentsAndContingenciesMinimumAnnualCommitmentsUnderTheProgrammingLicenseAgreementsAndOperatingLeasesDetails" />
    <roleRef roleURI="http://www.comcast.com/role/CondensedConsolidatedBalanceSheet" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_CondensedConsolidatedBalanceSheet" />
    <roleRef roleURI="http://www.comcast.com/role/CondensedConsolidatedBalanceSheetParenthetical" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_CondensedConsolidatedBalanceSheetParenthetical" />
    <roleRef roleURI="http://www.comcast.com/role/CondensedConsolidatedFinancialStatements" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_CondensedConsolidatedFinancialStatements" />
    <roleRef roleURI="http://www.comcast.com/role/CondensedConsolidatedStatementOfCashFlows" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_CondensedConsolidatedStatementOfCashFlows" />
    <roleRef roleURI="http://www.comcast.com/role/CondensedConsolidatedStatementOfChangesInEquity" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_CondensedConsolidatedStatementOfChangesInEquity" />
    <roleRef roleURI="http://www.comcast.com/role/CondensedConsolidatedStatementOfComprehensiveIncome" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_CondensedConsolidatedStatementOfComprehensiveIncome" />
    <roleRef roleURI="http://www.comcast.com/role/CondensedConsolidatedStatementOfComprehensiveIncomeParenthetical" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_CondensedConsolidatedStatementOfComprehensiveIncomeParenthetical" />
    <roleRef roleURI="http://www.comcast.com/role/CondensedConsolidatedStatementOfIncome" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_CondensedConsolidatedStatementOfIncome" />
    <roleRef roleURI="http://www.comcast.com/role/CondensedConsolidatedStatementOfIncomeNBCUniversal" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_CondensedConsolidatedStatementOfIncomeNBCUniversal" />
    <roleRef roleURI="http://www.comcast.com/role/CondensedConsolidatingFinancialInformationNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_CondensedConsolidatingFinancialInformationNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureAccountingPoliciesNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_AccountingPoliciesNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureAccountingPoliciesPolicy" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_AccountingPoliciesPolicy" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureBusinessAndBasisOfPresentationDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_BusinessAndBasisOfPresentationDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureCommitmentsAndContingencies" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureCommitmentsAndContingencies" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureCommitmentsAndContingenciesNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_CommitmentsAndContingenciesNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureCommitmentsAndContingenciesRentalExpenseDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureCommitmentsAndContingenciesRentalExpenseDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureCommitmentsAndContingenciesTables" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_CommitmentsAndContingenciesTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureCondensedConsolidatingFinancialInformationCondensedConsolidatingBalanceSheetDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_CondensedConsolidatingFinancialInformationCondensedConsolidatingBalanceSheetDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureCondensedConsolidatingFinancialInformationCondensedConsolidatingStatementOfCashFlowsDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_CondensedConsolidatingFinancialInformationCondensedConsolidatingStatementOfCashFlowsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureCondensedConsolidatingFinancialInformationCondensedConsolidatingStatementOfIncomeDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_CondensedConsolidatingFinancialInformationCondensedConsolidatingStatementOfIncomeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureEquity" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureEquity" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureEquityChangesInCommonStockDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_EquityChangesInCommonStockDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureEquityComponentsOfAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_EquityComponentsOfAccumulatedOtherComprehensiveIncomeLossDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureEquityNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_EquityNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureEquityTables" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_EquityTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureFairValueMeasurements" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureFairValueMeasurements" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureFairValueMeasurementsDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureFairValueMeasurementsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureFairValueMeasurementsTables" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureFairValueMeasurementsTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureFilmAndTelevisionCosts" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureFilmAndTelevisionCosts" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureFilmAndTelevisionCostsFilmAndTelevisionCostsDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_FilmAndTelevisionCostsFilmAndTelevisionCostsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureFilmAndTelevisionCostsNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_FilmAndTelevisionCostsNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureFilmAndTelevisionCostsTables" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureFilmAndTelevisionCostsTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureFinancialDataByBusinessSegment" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureFinancialDataByBusinessSegment" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureFinancialDataByBusinessSegmentDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_FinancialDataByBusinessSegmentDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureFinancialDataByBusinessSegmentTables" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_FinancialDataByBusinessSegmentTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureGoodwillAndIntangibleAssetsIntangibleAssetsDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_GoodwillAndIntangibleAssetsIntangibleAssetsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureGoodwillAndOtherIntangibleAssetsAmortizationOfIntangibleAssetsDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_GoodwillAndOtherIntangibleAssetsAmortizationOfIntangibleAssetsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureGoodwillRollforwardDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_GoodwillRollforwardDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureIncomeTaxes" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureIncomeTaxes" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureIncomeTaxesComponentsOfIncomeTaxExpenseDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_IncomeTaxesComponentsOfIncomeTaxExpenseDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureIncomeTaxesComponentsOfNetDeferredTaxLiabilityDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_IncomeTaxesComponentsOfNetDeferredTaxLiabilityDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureIncomeTaxesFederalStatutoryDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_IncomeTaxesFederalStatutoryDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureIncomeTaxesNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_IncomeTaxesNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureIncomeTaxesTables" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureIncomeTaxesTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureInvestments" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_Investments" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureInvestmentsCostMethodInvestmentsDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureInvestmentsCostMethodInvestmentsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureInvestmentsDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_InvestmentsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureInvestmentsEquityMethodInvestmentsDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_InvestmentsEquityMethodInvestmentsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureInvestmentsEquityMethodInvestmentsSummarizedFinancialInformationDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_InvestmentsEquityMethodInvestmentsSummarizedFinancialInformationDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureInvestmentsFairValueMethodInvestmentsDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_InvestmentsFairValueMethodInvestmentsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureInvestmentsInvestmentIncomeLossNetDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_InvestmentsInvestmentIncomeLossNetDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureInvestmentsTables" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_InvestmentsTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureLongTermDebt" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_LongTermDebt" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureLongTermDebtDebtMaturitiesDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureLongTermDebtDebtMaturitiesDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureLongTermDebtDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_LongTermDebtDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureLongTermDebtTables" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_LongTermDebtTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureNoncontrollingInterests" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureNoncontrollingInterests" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureNoncontrollingInterestsDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_NoncontrollingInterestsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureNoncontrollingInterestsTables" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_NoncontrollingInterestsTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefits" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosurePensionPlansAndPostretirementBenefits" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefitsComponentsOfBenefitsExpenseDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosurePensionPlansAndPostretirementBenefitsComponentsOfBenefitsExpenseDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefitsDeferredCompensationPlansDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosurePensionPlansAndPostretirementBenefitsDeferredCompensationPlansDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefitsExpectedFutureBenefitPaymentsDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosurePensionPlansAndPostretirementBenefitsExpectedFutureBenefitPaymentsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefitsInformationOnOurPensionBenefitPlansDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_PensionPlansAndPostretirementBenefitsInformationOnOurPensionBenefitPlansDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefitsNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_PensionPlansAndPostretirementBenefitsNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosurePostretirementPensionAndOtherEmployeeBenefitPlansTables" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosurePostretirementPensionAndOtherEmployeeBenefitPlansTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosurePropertyAndEquipment" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosurePropertyAndEquipment" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosurePropertyAndEquipmentDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_PropertyAndEquipmentDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosurePropertyAndEquipmentTables" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosurePropertyAndEquipmentTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureQuarterlyFinancialInformation" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureQuarterlyFinancialInformation" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureReceivablesMonetization" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureReceivablesMonetization" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureRelatedPartyTransactions" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_RelatedPartyTransactions" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureRelatedPartyTransactionsNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_RelatedPartyTransactionsNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureRelatedPartyTransactionsTables" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureRelatedPartyTransactionsTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureScheduleIIValuationAndQualifyingAccounts" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureScheduleIIValuationAndQualifyingAccounts" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureScheduleIIValuationAndQualifyingAccountsDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_ScheduleIIValuationAndQualifyingAccountsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureScheduleIIValuationAndQualifyingAccountsTables" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureScheduleIIValuationAndQualifyingAccountsTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureShareBasedCompensation" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureShareBasedCompensation" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureShareBasedCompensationNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_ShareBasedCompensationNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureShareBasedCompensationRecognizedShareBasedCompensationExpenseDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_ShareBasedCompensationRecognizedShareBasedCompensationExpenseDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureShareBasedCompensationRestrictedShareUnitsAndStockOptionFairValueDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureShareBasedCompensationRestrictedShareUnitsAndStockOptionFairValueDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureShareBasedCompensationStockOptionsAndRestrictedShareUnitsDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_ShareBasedCompensationStockOptionsAndRestrictedShareUnitsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureShareBasedCompensationTables" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureShareBasedCompensationTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureSignificantTransactions" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_SignificantTransactions" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureSignificantTransactionsNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_SignificantTransactionsNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureSignificantTransactionsTables" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_SignificantTransactionsTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureSubsequentEvents" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureSubsequentEvents" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureSupplementalFinancialInformation" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureSupplementalFinancialInformation" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureSupplementalFinancialInformationCashPaymentsForInterestAndIncomeTaxesDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureSupplementalFinancialInformationCashPaymentsForInterestAndIncomeTaxesDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureSupplementalFinancialInformationNetCashProvidedByOperatingActivitiesDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_SupplementalFinancialInformationNetCashProvidedByOperatingActivitiesDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureSupplementalFinancialInformationNoncashInvestingAndFinancingActivitiesDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_SupplementalFinancialInformationNoncashInvestingAndFinancingActivitiesDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureSupplementalFinancialInformationReceivablesDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureSupplementalFinancialInformationReceivablesDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureSupplementalFinancialInformationTables" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureSupplementalFinancialInformationTables" />
    <roleRef roleURI="http://www.comcast.com/role/DocumentAndEntityInformation" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DocumentAndEntityInformation" />
    <roleRef roleURI="http://www.comcast.com/role/FairValueDisclosureNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_FairValueDisclosureNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/Goodwill" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_Goodwill" />
    <roleRef roleURI="http://www.comcast.com/role/GoodwillTables" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_GoodwillTables" />
    <roleRef roleURI="http://www.comcast.com/role/LongTermDebtDebtBorrowingsDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_LongTermDebtDebtBorrowingsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/LongtermDebtDebtRepaymentsDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_LongtermDebtDebtRepaymentsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/LongTermDebtNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_LongTermDebtNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/RecentAccountingPronouncements" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_RecentAccountingPronouncements" />
    <roleRef roleURI="http://www.comcast.com/role/RecentAccountingPronouncementsNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_RecentAccountingPronouncementsNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/RelatedPartyTransactionsCondensedConsolidatedBalanceSheetDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureRelatedPartyTransactionsCondensedConsolidatedBalanceSheetDetails" />
    <roleRef roleURI="http://www.comcast.com/role/RelatedPartyTransactionsCondensedConsolidatedStatementOfIncomeDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureRelatedPartyTransactionsCondensedConsolidatedStatementOfIncomeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/SignificantTransactionsPreliminaryAllocationOfPurchasePriceDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_SignificantTransactionsPreliminaryAllocationOfPurchasePriceDetails" />
    <roleRef roleURI="http://www.comcast.com/role/SignificantTransactionsProFormaInformationDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_SignificantTransactionsProFormaInformationDetails" />
    <roleRef roleURI="http://www.comcast.com/role/SupplementalFinancialInformationComponentsOfAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="simple" xlink:href="cmcsa-20160630.xsd#ELRID_DisclosureSupplementalFinancialInformationComponentsOfAccumulatedOtherComprehensiveIncomeLossDetails" />
    <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" />
    <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" />
    <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" />
    <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" />
    <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" />
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/CondensedConsolidatedBalanceSheetParenthetical">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_23" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="Locator_us-gaap_StatementClassOfStockAxis_24" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_23" xlink:to="Locator_us-gaap_StatementClassOfStockAxis_24" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="Locator_us-gaap_StatementClassOfStockAxis_27" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_28" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_StatementClassOfStockAxis_27" xlink:to="Locator_us-gaap_ClassOfStockDomain_28" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="Locator_us-gaap_StatementClassOfStockAxis_57" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_58" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_StatementClassOfStockAxis_57" xlink:to="Locator_us-gaap_ClassOfStockDomain_58" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_29" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="Locator_us-gaap_CommonClassAMember_30" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_29" xlink:to="Locator_us-gaap_CommonClassAMember_30" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_31" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ClassaSpecialCommonStockMember" xlink:label="Locator_cmcsa_ClassaSpecialCommonStockMember_32" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_31" xlink:to="Locator_cmcsa_ClassaSpecialCommonStockMember_32" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_33" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="Locator_us-gaap_CommonClassBMember_34" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_33" xlink:to="Locator_us-gaap_CommonClassBMember_34" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_25" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_26" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_25" xlink:to="Locator_dei_LegalEntityAxis_26" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_35" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_36" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_35" xlink:to="Locator_dei_EntityDomain_36" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_37" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_38" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_37" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_38" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_39" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="Locator_us-gaap_PreferredStockSharesAuthorized_40" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_39" xlink:to="Locator_us-gaap_PreferredStockSharesAuthorized_40" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_41" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="Locator_us-gaap_PreferredStockSharesIssued_42" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_41" xlink:to="Locator_us-gaap_PreferredStockSharesIssued_42" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_43" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="Locator_us-gaap_CommonStockParOrStatedValuePerShare_44" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_43" xlink:to="Locator_us-gaap_CommonStockParOrStatedValuePerShare_44" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_45" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="Locator_us-gaap_CommonStockSharesAuthorized_46" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_45" xlink:to="Locator_us-gaap_CommonStockSharesAuthorized_46" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_47" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="Locator_us-gaap_CommonStockSharesIssued_48" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_47" xlink:to="Locator_us-gaap_CommonStockSharesIssued_48" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_49" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="Locator_us-gaap_CommonStockSharesOutstanding_50" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_49" xlink:to="Locator_us-gaap_CommonStockSharesOutstanding_50" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_51" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TreasuryStockShares" xlink:label="Locator_us-gaap_TreasuryStockShares_52" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_51" xlink:to="Locator_us-gaap_TreasuryStockShares_52" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_53" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="Locator_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_54" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_53" xlink:to="Locator_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_54" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_55" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="Locator_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_56" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_55" xlink:to="Locator_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_56" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_19" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_20" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_19" xlink:to="Locator_us-gaap_StatementTable_20" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/CondensedConsolidatedStatementOfIncome">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_161" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_162" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_161" xlink:to="Locator_dei_LegalEntityAxis_162" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_163" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_164" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_163" xlink:to="Locator_dei_EntityDomain_164" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_165" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_166" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_165" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_166" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_207" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="Locator_us-gaap_EarningsPerShareBasic_208" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_207" xlink:to="Locator_us-gaap_EarningsPerShareBasic_208" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_209" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="Locator_us-gaap_EarningsPerShareDiluted_210" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_209" xlink:to="Locator_us-gaap_EarningsPerShareDiluted_210" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_211" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockDividendsPerShareDeclared" xlink:label="Locator_us-gaap_CommonStockDividendsPerShareDeclared_212" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_211" xlink:to="Locator_us-gaap_CommonStockDividendsPerShareDeclared_212" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_203" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock" xlink:label="Locator_cmcsa_NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock_204" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_203" xlink:to="Locator_cmcsa_NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock_204" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_167" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Revenues" xlink:label="Locator_us-gaap_Revenues_168" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_167" xlink:to="Locator_us-gaap_Revenues_168" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_169" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_170" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_169" xlink:to="Locator_us-gaap_CostsAndExpensesAbstract_170" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_171" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ProgrammingAndProductionCosts" xlink:label="Locator_cmcsa_ProgrammingAndProductionCosts_172" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_171" xlink:to="Locator_cmcsa_ProgrammingAndProductionCosts_172" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_173" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_OtherOperatingAndAdministrative" xlink:label="Locator_cmcsa_OtherOperatingAndAdministrative_174" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_173" xlink:to="Locator_cmcsa_OtherOperatingAndAdministrative_174" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_175" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MarketingAndAdvertisingExpense" xlink:label="Locator_us-gaap_MarketingAndAdvertisingExpense_176" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_175" xlink:to="Locator_us-gaap_MarketingAndAdvertisingExpense_176" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_177" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Depreciation" xlink:label="Locator_us-gaap_Depreciation_178" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_177" xlink:to="Locator_us-gaap_Depreciation_178" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_179" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="Locator_us-gaap_AmortizationOfIntangibleAssets_180" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_179" xlink:to="Locator_us-gaap_AmortizationOfIntangibleAssets_180" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_181" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="Locator_us-gaap_CostsAndExpenses_182" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_181" xlink:to="Locator_us-gaap_CostsAndExpenses_182" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_183" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="Locator_us-gaap_OperatingIncomeLoss_184" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_183" xlink:to="Locator_us-gaap_OperatingIncomeLoss_184" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_185" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_186" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_185" xlink:to="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_186" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_187" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InterestExpense" xlink:label="Locator_us-gaap_InterestExpense_188" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_187" xlink:to="Locator_us-gaap_InterestExpense_188" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_189" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentIncomeNonoperating" xlink:label="Locator_us-gaap_InvestmentIncomeNonoperating_190" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_189" xlink:to="Locator_us-gaap_InvestmentIncomeNonoperating_190" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_191" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="Locator_us-gaap_IncomeLossFromEquityMethodInvestments_192" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_191" xlink:to="Locator_us-gaap_IncomeLossFromEquityMethodInvestments_192" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_193" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="Locator_us-gaap_OtherNonoperatingIncomeExpense_194" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_193" xlink:to="Locator_us-gaap_OtherNonoperatingIncomeExpense_194" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_195" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="Locator_us-gaap_NonoperatingIncomeExpense_196" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_195" xlink:to="Locator_us-gaap_NonoperatingIncomeExpense_196" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_197" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="Locator_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_198" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_197" xlink:to="Locator_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_198" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_199" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="Locator_us-gaap_IncomeTaxExpenseBenefit_200" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_199" xlink:to="Locator_us-gaap_IncomeTaxExpenseBenefit_200" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_201" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProfitLoss" xlink:label="Locator_us-gaap_ProfitLoss_202" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_201" xlink:to="Locator_us-gaap_ProfitLoss_202" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_205" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="Locator_us-gaap_NetIncomeLoss_206" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_205" xlink:to="Locator_us-gaap_NetIncomeLoss_206" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_123" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_124" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_123" xlink:to="Locator_us-gaap_StatementTable_124" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/CondensedConsolidatedStatementOfCashFlows">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_371" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_372" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_371" xlink:to="Locator_dei_LegalEntityAxis_372" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_373" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_374" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_373" xlink:to="Locator_dei_EntityDomain_374" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_375" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_376" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_375" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_376" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_449" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents" xlink:label="Locator_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_450" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_449" xlink:to="Locator_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_450" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_377" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_378" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_377" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_378" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_379" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivities_380" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_379" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivities_380" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_381" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_382" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_381" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_382" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_389" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_PaymentsForConstructionAndDevelopmentOfThemePark" xlink:label="Locator_cmcsa_PaymentsForConstructionAndDevelopmentOfThemePark_390" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_389" xlink:to="Locator_cmcsa_PaymentsForConstructionAndDevelopmentOfThemePark_390" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_391" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireBuildings" xlink:label="Locator_us-gaap_PaymentsToAcquireBuildings_392" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_391" xlink:to="Locator_us-gaap_PaymentsToAcquireBuildings_392" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_395" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NoteReceivableIssuedFromParent" xlink:label="Locator_cmcsa_NoteReceivableIssuedFromParent_396" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_395" xlink:to="Locator_cmcsa_NoteReceivableIssuedFromParent_396" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_383" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="Locator_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_384" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_383" xlink:to="Locator_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_384" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_385" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireIntangibleAssets" xlink:label="Locator_us-gaap_PaymentsToAcquireIntangibleAssets_386" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_385" xlink:to="Locator_us-gaap_PaymentsToAcquireIntangibleAssets_386" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_387" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_PaymentsForAcquisitionsAndConstructionOfRealEstateProperties" xlink:label="Locator_cmcsa_PaymentsForAcquisitionsAndConstructionOfRealEstateProperties_388" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_387" xlink:to="Locator_cmcsa_PaymentsForAcquisitionsAndConstructionOfRealEstateProperties_388" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_393" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="Locator_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_394" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_393" xlink:to="Locator_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_394" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_397" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ProceedsFromSalesOfBusinessesAndInvestments" xlink:label="Locator_cmcsa_ProceedsFromSalesOfBusinessesAndInvestments_398" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_397" xlink:to="Locator_cmcsa_ProceedsFromSalesOfBusinessesAndInvestments_398" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_399" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital" xlink:label="Locator_us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital_400" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_399" xlink:to="Locator_us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital_400" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_401" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireInvestments" xlink:label="Locator_us-gaap_PaymentsToAcquireInvestments_402" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_401" xlink:to="Locator_us-gaap_PaymentsToAcquireInvestments_402" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_403" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities" xlink:label="Locator_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_404" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_403" xlink:to="Locator_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_404" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_405" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivities_406" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_405" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivities_406" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_407" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_408" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_407" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_408" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_413" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ProceedsFromNoteReceivableIssuedToAndBorrowingsFromComcast" xlink:label="Locator_cmcsa_ProceedsFromNoteReceivableIssuedToAndBorrowingsFromComcast_414" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_413" xlink:to="Locator_cmcsa_ProceedsFromNoteReceivableIssuedToAndBorrowingsFromComcast_414" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_417" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_RepaymentsOfBorrowingsFromComcast" xlink:label="Locator_cmcsa_RepaymentsOfBorrowingsFromComcast_418" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_417" xlink:to="Locator_cmcsa_RepaymentsOfBorrowingsFromComcast_418" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_421" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DecreaseInShortTermLoansToGENet" xlink:label="Locator_cmcsa_DecreaseInShortTermLoansToGENet_422" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_421" xlink:to="Locator_cmcsa_DecreaseInShortTermLoansToGENet_422" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_423" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock" xlink:label="Locator_us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock_424" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_423" xlink:to="Locator_us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock_424" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_427" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_RedemptionTransactionDistribution" xlink:label="Locator_cmcsa_RedemptionTransactionDistribution_428" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_427" xlink:to="Locator_cmcsa_RedemptionTransactionDistribution_428" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_433" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DistributionsToNBCUniversalNoncontrollingInterestHolders" xlink:label="Locator_cmcsa_DistributionsToNBCUniversalNoncontrollingInterestHolders_434" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_433" xlink:to="Locator_cmcsa_DistributionsToNBCUniversalNoncontrollingInterestHolders_434" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_435" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Distributionstononcontrollinginterestholders" xlink:label="Locator_cmcsa_Distributionstononcontrollinginterestholders_436" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_435" xlink:to="Locator_cmcsa_Distributionstononcontrollinginterestholders_436" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_437" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsOfCapitalDistribution" xlink:label="Locator_us-gaap_PaymentsOfCapitalDistribution_438" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_437" xlink:to="Locator_us-gaap_PaymentsOfCapitalDistribution_438" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_441" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DistributionsToOtherNoncontrollingInterests" xlink:label="Locator_cmcsa_DistributionsToOtherNoncontrollingInterests_442" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_441" xlink:to="Locator_cmcsa_DistributionsToOtherNoncontrollingInterests_442" order="17.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_409" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromRepaymentsOfShortTermDebt" xlink:label="Locator_us-gaap_ProceedsFromRepaymentsOfShortTermDebt_410" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_409" xlink:to="Locator_us-gaap_ProceedsFromRepaymentsOfShortTermDebt_410" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_411" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt" xlink:label="Locator_us-gaap_ProceedsFromIssuanceOfLongTermDebt_412" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_411" xlink:to="Locator_us-gaap_ProceedsFromIssuanceOfLongTermDebt_412" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_415" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RepaymentsOfOtherDebt" xlink:label="Locator_us-gaap_RepaymentsOfOtherDebt_416" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_415" xlink:to="Locator_us-gaap_RepaymentsOfOtherDebt_416" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_419" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="Locator_us-gaap_PaymentsForRepurchaseOfCommonStock_420" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_419" xlink:to="Locator_us-gaap_PaymentsForRepurchaseOfCommonStock_420" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_425" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsOfDividends" xlink:label="Locator_us-gaap_PaymentsOfDividends_426" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_425" xlink:to="Locator_us-gaap_PaymentsOfDividends_426" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_429" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="Locator_us-gaap_ProceedsFromIssuanceOfCommonStock_430" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_429" xlink:to="Locator_us-gaap_ProceedsFromIssuanceOfCommonStock_430" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_431" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries" xlink:label="Locator_us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries_432" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_431" xlink:to="Locator_us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries_432" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_439" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DistributionsToNoncontrollingInterestsAndDividendsForRedeemableSubsidiaryPreferredStock" xlink:label="Locator_cmcsa_DistributionsToNoncontrollingInterestsAndDividendsForRedeemableSubsidiaryPreferredStock_440" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_439" xlink:to="Locator_cmcsa_DistributionsToNoncontrollingInterestsAndDividendsForRedeemableSubsidiaryPreferredStock_440" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_443" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SettlementOfStationVentureLiability" xlink:label="Locator_cmcsa_SettlementOfStationVentureLiability_444" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_443" xlink:to="Locator_cmcsa_SettlementOfStationVentureLiability_444" order="18.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_445" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities" xlink:label="Locator_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_446" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_445" xlink:to="Locator_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_446" order="19.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_447" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivities_448" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_447" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivities_448" order="20.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_451" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="Locator_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_452" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_451" xlink:to="Locator_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_452" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_453" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="Locator_us-gaap_CashAndCashEquivalentsAtCarryingValue_454" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_453" xlink:to="Locator_us-gaap_CashAndCashEquivalentsAtCarryingValue_454" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_235" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_236" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_235" xlink:to="Locator_us-gaap_StatementTable_236" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/CondensedConsolidatedStatementOfChangesInEquity">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_517" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="Locator_us-gaap_StatementEquityComponentsAxis_518" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_517" xlink:to="Locator_us-gaap_StatementEquityComponentsAxis_518" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="Locator_us-gaap_StatementEquityComponentsAxis_521" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_522" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_StatementEquityComponentsAxis_521" xlink:to="Locator_us-gaap_EquityComponentDomain_522" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="Locator_us-gaap_StatementEquityComponentsAxis_597" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_598" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_StatementEquityComponentsAxis_597" xlink:to="Locator_us-gaap_EquityComponentDomain_598" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_523" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStockMember" xlink:label="Locator_cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStockMember_524" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_523" xlink:to="Locator_cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStockMember_524" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_525" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="Locator_us-gaap_CommonClassAMember_526" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_525" xlink:to="Locator_us-gaap_CommonClassAMember_526" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_527" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ClassaSpecialCommonStockMember" xlink:label="Locator_cmcsa_ClassaSpecialCommonStockMember_528" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_527" xlink:to="Locator_cmcsa_ClassaSpecialCommonStockMember_528" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_529" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="Locator_us-gaap_CommonClassBMember_530" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_529" xlink:to="Locator_us-gaap_CommonClassBMember_530" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_531" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="Locator_us-gaap_AdditionalPaidInCapitalMember_532" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_531" xlink:to="Locator_us-gaap_AdditionalPaidInCapitalMember_532" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_533" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="Locator_us-gaap_RetainedEarningsMember_534" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_533" xlink:to="Locator_us-gaap_RetainedEarningsMember_534" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_535" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TreasuryStockMember" xlink:label="Locator_us-gaap_TreasuryStockMember_536" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_535" xlink:to="Locator_us-gaap_TreasuryStockMember_536" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_537" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeMember_538" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_537" xlink:to="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeMember_538" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_539" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NoncontrollingInterestMember" xlink:label="Locator_us-gaap_NoncontrollingInterestMember_540" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_539" xlink:to="Locator_us-gaap_NoncontrollingInterestMember_540" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_541" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_RedeemableNoncontrollingInterestMember" xlink:label="Locator_cmcsa_RedeemableNoncontrollingInterestMember_542" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_541" xlink:to="Locator_cmcsa_RedeemableNoncontrollingInterestMember_542" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_543" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockMember" xlink:label="Locator_us-gaap_CommonStockMember_544" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_543" xlink:to="Locator_us-gaap_CommonStockMember_544" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_545" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_MembersCapitalMember" xlink:label="Locator_cmcsa_MembersCapitalMember_546" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_545" xlink:to="Locator_cmcsa_MembersCapitalMember_546" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_519" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_520" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_519" xlink:to="Locator_dei_LegalEntityAxis_520" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_547" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_548" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_547" xlink:to="Locator_dei_EntityDomain_548" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_549" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_550" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_549" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_550" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_553" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="Locator_us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest_554" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_553" xlink:to="Locator_us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest_554" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_555" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_MembersEquityRemeasured" xlink:label="Locator_cmcsa_MembersEquityRemeasured_556" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_555" xlink:to="Locator_cmcsa_MembersEquityRemeasured_556" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_557" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ContributionOfComcastContentBusiness" xlink:label="Locator_cmcsa_ContributionOfComcastContentBusiness_558" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_557" xlink:to="Locator_cmcsa_ContributionOfComcastContentBusiness_558" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_559" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:label="Locator_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_560" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_559" xlink:to="Locator_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_560" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_561" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodValue" xlink:label="Locator_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_562" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_561" xlink:to="Locator_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_562" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_563" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan" xlink:label="Locator_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_564" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_563" xlink:to="Locator_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_564" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_565" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="Locator_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_566" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_565" xlink:to="Locator_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_566" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_567" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_RedemptionTransactionDistribution" xlink:label="Locator_cmcsa_RedemptionTransactionDistribution_568" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_567" xlink:to="Locator_cmcsa_RedemptionTransactionDistribution_568" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_569" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DividendsCommonStockCash" xlink:label="Locator_us-gaap_DividendsCommonStockCash_570" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_569" xlink:to="Locator_us-gaap_DividendsCommonStockCash_570" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_571" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions" xlink:label="Locator_us-gaap_StockIssuedDuringPeriodValueAcquisitions_572" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_571" xlink:to="Locator_us-gaap_StockIssuedDuringPeriodValueAcquisitions_572" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_575" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeLossNetOfTax_576" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_575" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeLossNetOfTax_576" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_577" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MinorityInterestDecreaseFromRedemptions" xlink:label="Locator_us-gaap_MinorityInterestDecreaseFromRedemptions_578" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_577" xlink:to="Locator_us-gaap_MinorityInterestDecreaseFromRedemptions_578" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_579" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_PurchaseOfNoncontrollingCommonEquityInterest" xlink:label="Locator_cmcsa_PurchaseOfNoncontrollingCommonEquityInterest_580" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_579" xlink:to="Locator_cmcsa_PurchaseOfNoncontrollingCommonEquityInterest_580" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_581" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterests" xlink:label="Locator_cmcsa_NoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterests_582" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_581" xlink:to="Locator_cmcsa_NoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterests_582" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_583" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NoncontrollingInterestIncreaseFromEquityIssuanceOrSaleOfParentEquityInterest" xlink:label="Locator_cmcsa_NoncontrollingInterestIncreaseFromEquityIssuanceOrSaleOfParentEquityInterest_584" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_583" xlink:to="Locator_cmcsa_NoncontrollingInterestIncreaseFromEquityIssuanceOrSaleOfParentEquityInterest_584" order="17.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_585" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SubsidiaryPreferredStock" xlink:label="Locator_cmcsa_SubsidiaryPreferredStock_586" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_585" xlink:to="Locator_cmcsa_SubsidiaryPreferredStock_586" order="18.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_587" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests" xlink:label="Locator_cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests_588" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_587" xlink:to="Locator_cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests_588" order="19.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_589" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ReclassificationOfClassASpecialCommonStock" xlink:label="Locator_cmcsa_ReclassificationOfClassASpecialCommonStock_590" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_589" xlink:to="Locator_cmcsa_ReclassificationOfClassASpecialCommonStock_590" order="20.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_591" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Equityimpactrelatedtoacquisition" xlink:label="Locator_cmcsa_Equityimpactrelatedtoacquisition_592" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_591" xlink:to="Locator_cmcsa_Equityimpactrelatedtoacquisition_592" order="21.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_593" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityOther" xlink:label="Locator_us-gaap_StockholdersEquityOther_594" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_593" xlink:to="Locator_us-gaap_StockholdersEquityOther_594" order="22.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_595" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_EquityProfitLoss" xlink:label="Locator_cmcsa_EquityProfitLoss_596" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_595" xlink:to="Locator_cmcsa_EquityProfitLoss_596" order="23.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_573" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Contributionfrommember" xlink:label="Locator_cmcsa_Contributionfrommember_574" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_573" xlink:to="Locator_cmcsa_Contributionfrommember_574" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_551" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_552" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_551" xlink:to="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_552" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_513" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_514" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_513" xlink:to="Locator_us-gaap_StatementTable_514" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/CondensedConsolidatedStatementOfComprehensiveIncome">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_691" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_692" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_691" xlink:to="Locator_dei_LegalEntityAxis_692" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_693" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_694" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_693" xlink:to="Locator_dei_EntityDomain_694" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_695" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_696" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_695" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_696" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_699" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_700" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_699" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_700" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_701" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_702" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_701" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_702" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_703" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_AmountsReclassifiedToNetIncomeAbstract" xlink:label="Locator_cmcsa_AmountsReclassifiedToNetIncomeAbstract_704" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_703" xlink:to="Locator_cmcsa_AmountsReclassifiedToNetIncomeAbstract_704" order="4.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_AmountsReclassifiedToNetIncomeAbstract" xlink:label="Locator_cmcsa_AmountsReclassifiedToNetIncomeAbstract_705" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_706" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_AmountsReclassifiedToNetIncomeAbstract_705" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_706" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_AmountsReclassifiedToNetIncomeAbstract" xlink:label="Locator_cmcsa_AmountsReclassifiedToNetIncomeAbstract_707" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_708" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_AmountsReclassifiedToNetIncomeAbstract_707" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_708" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_709" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_710" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_709" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_710" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_711" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_712" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_711" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_712" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_713" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_OtherOCI" xlink:label="Locator_cmcsa_OtherOCI_714" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_713" xlink:to="Locator_cmcsa_OtherOCI_714" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_715" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:label="Locator_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_716" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_715" xlink:to="Locator_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_716" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_721" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest_722" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_721" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest_722" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_719" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock" xlink:label="Locator_cmcsa_NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock_720" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_719" xlink:to="Locator_cmcsa_NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock_720" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_723" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="Locator_us-gaap_ComprehensiveIncomeNetOfTax_724" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_723" xlink:to="Locator_us-gaap_ComprehensiveIncomeNetOfTax_724" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_697" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProfitLoss" xlink:label="Locator_us-gaap_ProfitLoss_698" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_697" xlink:to="Locator_us-gaap_ProfitLoss_698" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_717" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="Locator_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_718" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_717" xlink:to="Locator_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_718" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_663" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_664" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_663" xlink:to="Locator_us-gaap_StatementTable_664" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/CondensedConsolidatedStatementOfComprehensiveIncomeParenthetical">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_749" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_750" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_749" xlink:to="Locator_dei_LegalEntityAxis_750" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_751" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_752" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_751" xlink:to="Locator_dei_EntityDomain_752" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_753" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ParentCompanyMember" xlink:label="Locator_us-gaap_ParentCompanyMember_754" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_753" xlink:to="Locator_us-gaap_ParentCompanyMember_754" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_755" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_756" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_755" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_756" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_757" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax_758" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_757" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax_758" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_759" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax_760" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_759" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax_760" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_761" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax_762" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_761" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax_762" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_763" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax_764" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_763" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax_764" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_765" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_766" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_765" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_766" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_767" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax_768" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_767" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax_768" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_745" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_746" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_745" xlink:to="Locator_us-gaap_StatementTable_746" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/RecentAccountingPronouncements">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_787" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_788" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_787" xlink:to="Locator_dei_LegalEntityAxis_788" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_789" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_790" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_789" xlink:to="Locator_dei_EntityDomain_790" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_791" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_792" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_791" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_792" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_793" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock" xlink:label="Locator_us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_794" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_793" xlink:to="Locator_us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_794" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_795" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock" xlink:label="Locator_us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_796" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_795" xlink:to="Locator_us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_796" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_783" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_784" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_783" xlink:to="Locator_us-gaap_StatementTable_784" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureSignificantTransactions">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_813" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_814" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_813" xlink:to="Locator_dei_LegalEntityAxis_814" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_815" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_816" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_815" xlink:to="Locator_dei_EntityDomain_816" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_817" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_818" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_817" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_818" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_819" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsTextBlock" xlink:label="Locator_cmcsa_SignificantTransactionsTextBlock_820" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_819" xlink:to="Locator_cmcsa_SignificantTransactionsTextBlock_820" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_809" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_810" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_809" xlink:to="Locator_us-gaap_StatementTable_810" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureInvestments">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_835" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_836" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_835" xlink:to="Locator_dei_LegalEntityAxis_836" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_837" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_838" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_837" xlink:to="Locator_dei_EntityDomain_838" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_843" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_844" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_dei_LegalEntityAxis_843" xlink:to="Locator_dei_EntityDomain_844" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_839" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_840" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_839" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_840" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_841" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_InvestmentsTextBlock" xlink:label="Locator_cmcsa_InvestmentsTextBlock_842" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_841" xlink:to="Locator_cmcsa_InvestmentsTextBlock_842" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_831" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_832" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_831" xlink:to="Locator_us-gaap_StatementTable_832" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/Goodwill">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_861" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_862" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_861" xlink:to="Locator_dei_LegalEntityAxis_862" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_863" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_864" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_863" xlink:to="Locator_dei_EntityDomain_864" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_865" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_866" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_865" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_866" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_867" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GoodwillDisclosureTextBlock" xlink:label="Locator_us-gaap_GoodwillDisclosureTextBlock_868" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_867" xlink:to="Locator_us-gaap_GoodwillDisclosureTextBlock_868" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_869" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock" xlink:label="Locator_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_870" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_869" xlink:to="Locator_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_870" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_857" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_858" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_857" xlink:to="Locator_us-gaap_StatementTable_858" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureLongTermDebt">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_885" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_886" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_885" xlink:to="Locator_dei_LegalEntityAxis_886" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_887" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_888" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_887" xlink:to="Locator_dei_EntityDomain_888" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_889" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_890" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_889" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_890" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_891" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtDisclosureTextBlock" xlink:label="Locator_us-gaap_DebtDisclosureTextBlock_892" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_891" xlink:to="Locator_us-gaap_DebtDisclosureTextBlock_892" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_881" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_882" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_881" xlink:to="Locator_us-gaap_StatementTable_882" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureFairValueMeasurements">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_903" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_904" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_903" xlink:to="Locator_dei_LegalEntityAxis_904" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_905" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_906" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_905" xlink:to="Locator_dei_EntityDomain_906" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_907" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_908" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_907" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_908" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_909" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueDisclosuresTextBlock" xlink:label="Locator_us-gaap_FairValueDisclosuresTextBlock_910" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_909" xlink:to="Locator_us-gaap_FairValueDisclosuresTextBlock_910" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_911" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_912" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_911" xlink:to="Locator_us-gaap_StatementTable_912" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureNoncontrollingInterests">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_925" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_926" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_925" xlink:to="Locator_dei_LegalEntityAxis_926" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_927" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_928" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_927" xlink:to="Locator_dei_EntityDomain_928" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_929" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_930" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_929" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_930" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_931" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MinorityInterestDisclosureTextBlock" xlink:label="Locator_us-gaap_MinorityInterestDisclosureTextBlock_932" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_931" xlink:to="Locator_us-gaap_MinorityInterestDisclosureTextBlock_932" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_933" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_934" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_933" xlink:to="Locator_us-gaap_StatementTable_934" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureEquity">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_947" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_948" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_947" xlink:to="Locator_dei_LegalEntityAxis_948" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_949" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_950" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_949" xlink:to="Locator_dei_EntityDomain_950" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_951" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_952" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_951" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_952" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_953" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:label="Locator_us-gaap_StockholdersEquityNoteDisclosureTextBlock_954" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_953" xlink:to="Locator_us-gaap_StockholdersEquityNoteDisclosureTextBlock_954" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_955" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_956" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_955" xlink:to="Locator_us-gaap_StatementTable_956" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureSupplementalFinancialInformation">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_969" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_970" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_969" xlink:to="Locator_dei_LegalEntityAxis_970" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_971" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_972" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_971" xlink:to="Locator_dei_EntityDomain_972" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_973" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_974" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_973" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_974" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_975" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdditionalFinancialInformationDisclosureTextBlock" xlink:label="Locator_us-gaap_AdditionalFinancialInformationDisclosureTextBlock_976" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_975" xlink:to="Locator_us-gaap_AdditionalFinancialInformationDisclosureTextBlock_976" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_977" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_978" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_977" xlink:to="Locator_us-gaap_StatementTable_978" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureCommitmentsAndContingencies">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_991" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_992" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_991" xlink:to="Locator_dei_LegalEntityAxis_992" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_993" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_994" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_993" xlink:to="Locator_dei_EntityDomain_994" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_995" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_996" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_995" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_996" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_997" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:label="Locator_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_998" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_997" xlink:to="Locator_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_998" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_999" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1000" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_999" xlink:to="Locator_us-gaap_StatementTable_1000" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureFinancialDataByBusinessSegment">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1013" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1014" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1013" xlink:to="Locator_dei_LegalEntityAxis_1014" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1015" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1016" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1015" xlink:to="Locator_dei_EntityDomain_1016" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1017" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1018" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1017" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1018" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1019" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentReportingDisclosureTextBlock" xlink:label="Locator_us-gaap_SegmentReportingDisclosureTextBlock_1020" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1019" xlink:to="Locator_us-gaap_SegmentReportingDisclosureTextBlock_1020" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1021" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1022" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1021" xlink:to="Locator_us-gaap_StatementTable_1022" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureInvestmentsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1079" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="Locator_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1080" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1079" xlink:to="Locator_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1080" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="Locator_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1085" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1086" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1085" xlink:to="Locator_us-gaap_EquityMethodInvesteeNameDomain_1086" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="Locator_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1125" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1126" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1125" xlink:to="Locator_us-gaap_EquityMethodInvesteeNameDomain_1126" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1087" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_AtairosMember" xlink:label="Locator_cmcsa_AtairosMember_1088" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityMethodInvesteeNameDomain_1087" xlink:to="Locator_cmcsa_AtairosMember_1088" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1089" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_HuluMember" xlink:label="Locator_cmcsa_HuluMember_1090" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityMethodInvesteeNameDomain_1089" xlink:to="Locator_cmcsa_HuluMember_1090" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1091" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_OtherInvestmentMember" xlink:label="Locator_cmcsa_OtherInvestmentMember_1092" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityMethodInvesteeNameDomain_1091" xlink:to="Locator_cmcsa_OtherInvestmentMember_1092" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1093" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_AirTouchMember" xlink:label="Locator_cmcsa_AirTouchMember_1094" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityMethodInvesteeNameDomain_1093" xlink:to="Locator_cmcsa_AirTouchMember_1094" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1095" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_OtherEquityMethodInvestmentsMember" xlink:label="Locator_cmcsa_OtherEquityMethodInvestmentsMember_1096" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityMethodInvesteeNameDomain_1095" xlink:to="Locator_cmcsa_OtherEquityMethodInvestmentsMember_1096" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1097" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquitySecuritiesMember" xlink:label="Locator_us-gaap_EquitySecuritiesMember_1098" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityMethodInvesteeNameDomain_1097" xlink:to="Locator_us-gaap_EquitySecuritiesMember_1098" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1101" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_WeatherChannelMember" xlink:label="Locator_cmcsa_WeatherChannelMember_1102" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityMethodInvesteeNameDomain_1101" xlink:to="Locator_cmcsa_WeatherChannelMember_1102" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1099" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FairValueMethodMember" xlink:label="Locator_cmcsa_FairValueMethodMember_1100" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityMethodInvesteeNameDomain_1099" xlink:to="Locator_cmcsa_FairValueMethodMember_1100" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1083" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_1084" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1083" xlink:to="Locator_cmcsa_LegalEntity1Axis_1084" order="3.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_1103" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_1104" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_LegalEntity1Axis_1103" xlink:to="Locator_cmcsa_Entity1Domain_1104" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_1127" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_1128" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_cmcsa_LegalEntity1Axis_1127" xlink:to="Locator_cmcsa_Entity1Domain_1128" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_1105" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1106" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_Entity1Domain_1105" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1106" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1081" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1082" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1081" xlink:to="Locator_dei_LegalEntityAxis_1082" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1107" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1108" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1107" xlink:to="Locator_dei_EntityDomain_1108" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1109" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_AirTouchMember" xlink:label="Locator_cmcsa_AirTouchMember_1110" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1109" xlink:to="Locator_cmcsa_AirTouchMember_1110" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1111" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MarketableSecurities" xlink:label="Locator_us-gaap_MarketableSecurities_1112" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1111" xlink:to="Locator_us-gaap_MarketableSecurities_1112" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1113" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesNoncurrent" xlink:label="Locator_us-gaap_AvailableForSaleSecuritiesNoncurrent_1114" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1113" xlink:to="Locator_us-gaap_AvailableForSaleSecuritiesNoncurrent_1114" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1115" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvestments" xlink:label="Locator_us-gaap_EquityMethodInvestments_1116" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1115" xlink:to="Locator_us-gaap_EquityMethodInvestments_1116" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1117" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostMethodInvestments" xlink:label="Locator_us-gaap_CostMethodInvestments_1118" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1117" xlink:to="Locator_us-gaap_CostMethodInvestments_1118" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1119" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Investments" xlink:label="Locator_us-gaap_Investments_1120" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1119" xlink:to="Locator_us-gaap_Investments_1120" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1121" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShortTermInvestments" xlink:label="Locator_us-gaap_ShortTermInvestments_1122" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1121" xlink:to="Locator_us-gaap_ShortTermInvestments_1122" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1123" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermInvestments" xlink:label="Locator_us-gaap_LongTermInvestments_1124" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1123" xlink:to="Locator_us-gaap_LongTermInvestments_1124" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1067" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1068" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1067" xlink:to="Locator_us-gaap_StatementTable_1068" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureInvestmentsFairValueMethodInvestmentsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1217" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="Locator_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1218" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1217" xlink:to="Locator_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1218" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="Locator_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1225" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1226" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1225" xlink:to="Locator_us-gaap_EquityMethodInvesteeNameDomain_1226" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1227" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FairValueMethodMember" xlink:label="Locator_cmcsa_FairValueMethodMember_1228" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityMethodInvesteeNameDomain_1227" xlink:to="Locator_cmcsa_FairValueMethodMember_1228" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1221" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_1222" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1221" xlink:to="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_1222" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_1229" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_1230" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_1229" xlink:to="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_1230" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_1305" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_1306" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_1305" xlink:to="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_1306" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_1231" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_PrepaidForwardSaleObligationsMember" xlink:label="Locator_cmcsa_PrepaidForwardSaleObligationsMember_1232" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_1231" xlink:to="Locator_cmcsa_PrepaidForwardSaleObligationsMember_1232" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1223" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_1224" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1223" xlink:to="Locator_cmcsa_LegalEntity1Axis_1224" order="4.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_1233" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_1234" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_LegalEntity1Axis_1233" xlink:to="Locator_cmcsa_Entity1Domain_1234" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_1235" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1236" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_Entity1Domain_1235" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1236" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1219" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1220" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1219" xlink:to="Locator_dei_LegalEntityAxis_1220" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1237" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1238" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1237" xlink:to="Locator_dei_EntityDomain_1238" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1239" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SpectrumCoLlcMember" xlink:label="Locator_cmcsa_SpectrumCoLlcMember_1240" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1239" xlink:to="Locator_cmcsa_SpectrumCoLlcMember_1240" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1241" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_MsnbccomMember" xlink:label="Locator_cmcsa_MsnbccomMember_1242" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1241" xlink:to="Locator_cmcsa_MsnbccomMember_1242" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1245" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ClearwireLlcMember" xlink:label="Locator_cmcsa_ClearwireLlcMember_1246" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1245" xlink:to="Locator_cmcsa_ClearwireLlcMember_1246" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1247" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_AeTelevisionNetworksLlcMember" xlink:label="Locator_cmcsa_AeTelevisionNetworksLlcMember_1248" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1247" xlink:to="Locator_cmcsa_AeTelevisionNetworksLlcMember_1248" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1249" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ClearwireCorpMember" xlink:label="Locator_cmcsa_ClearwireCorpMember_1250" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1249" xlink:to="Locator_cmcsa_ClearwireCorpMember_1250" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1251" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SubsidiaryOfLibertyMediaMember" xlink:label="Locator_cmcsa_SubsidiaryOfLibertyMediaMember_1252" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1251" xlink:to="Locator_cmcsa_SubsidiaryOfLibertyMediaMember_1252" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1253" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CurrentYearPurchasesMember" xlink:label="Locator_cmcsa_CurrentYearPurchasesMember_1254" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1253" xlink:to="Locator_cmcsa_CurrentYearPurchasesMember_1254" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1255" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FairValueOfSpecificContractObligationMember" xlink:label="Locator_cmcsa_FairValueOfSpecificContractObligationMember_1256" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1255" xlink:to="Locator_cmcsa_FairValueOfSpecificContractObligationMember_1256" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1257" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_LibertyMediaRedemptionTransactionMember" xlink:label="Locator_cmcsa_LibertyMediaRedemptionTransactionMember_1258" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1257" xlink:to="Locator_cmcsa_LibertyMediaRedemptionTransactionMember_1258" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1243" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_WeatherChannelMember" xlink:label="Locator_cmcsa_WeatherChannelMember_1244" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1243" xlink:to="Locator_cmcsa_WeatherChannelMember_1244" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1259" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_EquitySecuritiesHeldAsCollateral" xlink:label="Locator_cmcsa_EquitySecuritiesHeldAsCollateral_1260" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1259" xlink:to="Locator_cmcsa_EquitySecuritiesHeldAsCollateral_1260" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1261" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_PercentageOfFairValueDebtAndEquitySecuritiesHeldAsCollateral" xlink:label="Locator_cmcsa_PercentageOfFairValueDebtAndEquitySecuritiesHeldAsCollateral_1262" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1261" xlink:to="Locator_cmcsa_PercentageOfFairValueDebtAndEquitySecuritiesHeldAsCollateral_1262" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1263" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ObligationsUnderPrepaidForwardSaleAgreements" xlink:label="Locator_cmcsa_ObligationsUnderPrepaidForwardSaleAgreements_1264" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1263" xlink:to="Locator_cmcsa_ObligationsUnderPrepaidForwardSaleAgreements_1264" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1265" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DerivativeFairValueOfEmbeddedDerivativeLiabilityComponentOfPrepaidForwardSaleAgreements" xlink:label="Locator_cmcsa_DerivativeFairValueOfEmbeddedDerivativeLiabilityComponentOfPrepaidForwardSaleAgreements_1266" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1265" xlink:to="Locator_cmcsa_DerivativeFairValueOfEmbeddedDerivativeLiabilityComponentOfPrepaidForwardSaleAgreements_1266" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1267" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_LiabilitiesRelatedToPrepaidForwardSaleAgreements" xlink:label="Locator_cmcsa_LiabilitiesRelatedToPrepaidForwardSaleAgreements_1268" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1267" xlink:to="Locator_cmcsa_LiabilitiesRelatedToPrepaidForwardSaleAgreements_1268" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1269" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_PrepaidForwardSaleObligationsFairValue" xlink:label="Locator_cmcsa_PrepaidForwardSaleObligationsFairValue_1270" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1269" xlink:to="Locator_cmcsa_PrepaidForwardSaleObligationsFairValue_1270" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1271" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains" xlink:label="Locator_us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains_1272" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1271" xlink:to="Locator_us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains_1272" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1273" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss" xlink:label="Locator_us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss_1274" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1273" xlink:to="Locator_us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss_1274" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1275" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CumulativeUnrealizedGainsLossesInEarningsRelatedToFairValueHedges" xlink:label="Locator_cmcsa_CumulativeUnrealizedGainsLossesInEarningsRelatedToFairValueHedges_1276" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1275" xlink:to="Locator_cmcsa_CumulativeUnrealizedGainsLossesInEarningsRelatedToFairValueHedges_1276" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1277" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities" xlink:label="Locator_us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities_1278" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1277" xlink:to="Locator_us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities_1278" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1279" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesGrossRealizedGains" xlink:label="Locator_us-gaap_AvailableForSaleSecuritiesGrossRealizedGains_1280" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1279" xlink:to="Locator_us-gaap_AvailableForSaleSecuritiesGrossRealizedGains_1280" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1281" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConversionOfStockSharesIssued1" xlink:label="Locator_us-gaap_ConversionOfStockSharesIssued1_1282" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1281" xlink:to="Locator_us-gaap_ConversionOfStockSharesIssued1_1282" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1283" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent" xlink:label="Locator_us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent_1284" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1283" xlink:to="Locator_us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent_1284" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1285" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_EquityMethodInvestmentSharesIssued" xlink:label="Locator_cmcsa_EquityMethodInvestmentSharesIssued_1286" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1285" xlink:to="Locator_cmcsa_EquityMethodInvestmentSharesIssued_1286" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1287" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentOwnedBalanceShares" xlink:label="Locator_us-gaap_InvestmentOwnedBalanceShares_1288" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1287" xlink:to="Locator_us-gaap_InvestmentOwnedBalanceShares_1288" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1289" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_PrepaidForwardObligationsSettlement" xlink:label="Locator_cmcsa_PrepaidForwardObligationsSettlement_1290" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1289" xlink:to="Locator_cmcsa_PrepaidForwardObligationsSettlement_1290" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1291" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_EquitySecuritiesPurchasedInPeriod" xlink:label="Locator_cmcsa_EquitySecuritiesPurchasedInPeriod_1292" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1291" xlink:to="Locator_cmcsa_EquitySecuritiesPurchasedInPeriod_1292" order="17.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1293" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SharesRedeemed" xlink:label="Locator_cmcsa_SharesRedeemed_1294" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1293" xlink:to="Locator_cmcsa_SharesRedeemed_1294" order="18.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1295" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SharesHeldInAcquiredEntity" xlink:label="Locator_cmcsa_SharesHeldInAcquiredEntity_1296" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1295" xlink:to="Locator_cmcsa_SharesHeldInAcquiredEntity_1296" order="19.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1297" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue" xlink:label="Locator_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_1298" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1297" xlink:to="Locator_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_1298" order="20.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1299" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FairValueOfSharesDeliveredInTransaction" xlink:label="Locator_cmcsa_FairValueOfSharesDeliveredInTransaction_1300" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1299" xlink:to="Locator_cmcsa_FairValueOfSharesDeliveredInTransaction_1300" order="21.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1301" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FairValueInvestmentSharesSold" xlink:label="Locator_cmcsa_FairValueInvestmentSharesSold_1302" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1301" xlink:to="Locator_cmcsa_FairValueInvestmentSharesSold_1302" order="22.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1303" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax_1304" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1303" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax_1304" order="23.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1209" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1210" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1209" xlink:to="Locator_us-gaap_StatementTable_1210" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureInvestmentsEquityMethodInvestmentsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1419" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_1420" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1419" xlink:to="Locator_cmcsa_LegalEntity1Axis_1420" order="2.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_1421" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_1422" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_LegalEntity1Axis_1421" xlink:to="Locator_cmcsa_Entity1Domain_1422" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_1425" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_AtairosMember" xlink:label="Locator_cmcsa_AtairosMember_1426" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_Entity1Domain_1425" xlink:to="Locator_cmcsa_AtairosMember_1426" order="2.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_1423" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1424" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_Entity1Domain_1423" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1424" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1417" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1418" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1417" xlink:to="Locator_dei_LegalEntityAxis_1418" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1427" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1428" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1427" xlink:to="Locator_dei_EntityDomain_1428" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1429" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ComcastCorporationCapitalContributionMember" xlink:label="Locator_cmcsa_ComcastCorporationCapitalContributionMember_1430" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1429" xlink:to="Locator_cmcsa_ComcastCorporationCapitalContributionMember_1430" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1431" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ManagementCompanyInvestorsCapitalContributionMember" xlink:label="Locator_cmcsa_ManagementCompanyInvestorsCapitalContributionMember_1432" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1431" xlink:to="Locator_cmcsa_ManagementCompanyInvestorsCapitalContributionMember_1432" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1433" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FormerCfoCapitalContributionMember" xlink:label="Locator_cmcsa_FormerCfoCapitalContributionMember_1434" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1433" xlink:to="Locator_cmcsa_FormerCfoCapitalContributionMember_1434" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1435" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TermOfAgreementMember" xlink:label="Locator_cmcsa_TermOfAgreementMember_1436" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1435" xlink:to="Locator_cmcsa_TermOfAgreementMember_1436" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1437" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_WeatherChannelMember" xlink:label="Locator_cmcsa_WeatherChannelMember_1438" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1437" xlink:to="Locator_cmcsa_WeatherChannelMember_1438" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1439" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_HuluMember" xlink:label="Locator_cmcsa_HuluMember_1440" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1439" xlink:to="Locator_cmcsa_HuluMember_1440" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1441" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="Locator_us-gaap_EquityMethodInvestmentOwnershipPercentage_1442" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1441" xlink:to="Locator_us-gaap_EquityMethodInvestmentOwnershipPercentage_1442" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1443" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax" xlink:label="Locator_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_1444" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1443" xlink:to="Locator_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_1444" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1445" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredIncludingEquityInterestInAcquireeHeldPriorToCombination1" xlink:label="Locator_us-gaap_BusinessCombinationConsiderationTransferredIncludingEquityInterestInAcquireeHeldPriorToCombination1_1446" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1445" xlink:to="Locator_us-gaap_BusinessCombinationConsiderationTransferredIncludingEquityInterestInAcquireeHeldPriorToCombination1_1446" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1447" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity" xlink:label="Locator_us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity_1448" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1447" xlink:to="Locator_us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity_1448" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1449" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NumberOfWireLessSpectrumLicenses" xlink:label="Locator_cmcsa_NumberOfWireLessSpectrumLicenses_1450" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1449" xlink:to="Locator_cmcsa_NumberOfWireLessSpectrumLicenses_1450" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1451" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CashPaidByEquityMethodInvestmentForIntangibleAssets" xlink:label="Locator_cmcsa_CashPaidByEquityMethodInvestmentForIntangibleAssets_1452" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1451" xlink:to="Locator_cmcsa_CashPaidByEquityMethodInvestmentForIntangibleAssets_1452" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1453" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireEquityMethodInvestments" xlink:label="Locator_us-gaap_PaymentsToAcquireEquityMethodInvestments_1454" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1453" xlink:to="Locator_us-gaap_PaymentsToAcquireEquityMethodInvestments_1454" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1455" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ExpectedProceedsReceivedByEquityMethodInvestmentForSaleOfIntangibleAssets" xlink:label="Locator_cmcsa_ExpectedProceedsReceivedByEquityMethodInvestmentForSaleOfIntangibleAssets_1456" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1455" xlink:to="Locator_cmcsa_ExpectedProceedsReceivedByEquityMethodInvestmentForSaleOfIntangibleAssets_1456" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1457" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ExpectedProceedsFromSaleOfEquityMethodInvestment" xlink:label="Locator_cmcsa_ExpectedProceedsFromSaleOfEquityMethodInvestment_1458" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1457" xlink:to="Locator_cmcsa_ExpectedProceedsFromSaleOfEquityMethodInvestment_1458" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1459" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_InitialInvestmentByInvestorGroup" xlink:label="Locator_cmcsa_InitialInvestmentByInvestorGroup_1460" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1459" xlink:to="Locator_cmcsa_InitialInvestmentByInvestorGroup_1460" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1461" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_InitialInvestmentInEquityMethodInvestment" xlink:label="Locator_cmcsa_InitialInvestmentInEquityMethodInvestment_1462" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1461" xlink:to="Locator_cmcsa_InitialInvestmentInEquityMethodInvestment_1462" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1463" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromSaleOfIntangibleAssets" xlink:label="Locator_us-gaap_ProceedsFromSaleOfIntangibleAssets_1464" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1463" xlink:to="Locator_us-gaap_ProceedsFromSaleOfIntangibleAssets_1464" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1465" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_PercentageOfCashReceivedFromInvestees" xlink:label="Locator_cmcsa_PercentageOfCashReceivedFromInvestees_1466" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1465" xlink:to="Locator_cmcsa_PercentageOfCashReceivedFromInvestees_1466" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1467" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_EquityMethodInvestmentProceedsFromSaleOfAsset" xlink:label="Locator_cmcsa_EquityMethodInvestmentProceedsFromSaleOfAsset_1468" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1467" xlink:to="Locator_cmcsa_EquityMethodInvestmentProceedsFromSaleOfAsset_1468" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1469" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_IncomeLossFromEquityMethodInvestmentsRelatedToGainLossOnSaleOfAsset" xlink:label="Locator_cmcsa_IncomeLossFromEquityMethodInvestmentsRelatedToGainLossOnSaleOfAsset_1470" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1469" xlink:to="Locator_cmcsa_IncomeLossFromEquityMethodInvestmentsRelatedToGainLossOnSaleOfAsset_1470" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1471" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvestmentNetSalesProceeds" xlink:label="Locator_us-gaap_EquityMethodInvestmentNetSalesProceeds_1472" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1471" xlink:to="Locator_us-gaap_EquityMethodInvestmentNetSalesProceeds_1472" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1473" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxExpenseOnSaleOfEquityMethodInvestment" xlink:label="Locator_cmcsa_TaxExpenseOnSaleOfEquityMethodInvestment_1474" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1473" xlink:to="Locator_cmcsa_TaxExpenseOnSaleOfEquityMethodInvestment_1474" order="17.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1475" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TotalDistributionFromInvestee" xlink:label="Locator_cmcsa_TotalDistributionFromInvestee_1476" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1475" xlink:to="Locator_cmcsa_TotalDistributionFromInvestee_1476" order="18.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1477" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment" xlink:label="Locator_us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment_1478" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1477" xlink:to="Locator_us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment_1478" order="19.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1479" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital" xlink:label="Locator_us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital_1480" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1479" xlink:to="Locator_us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital_1480" order="20.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1481" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Goodwillimpairmentlossfromequitymethodinvestments" xlink:label="Locator_cmcsa_Goodwillimpairmentlossfromequitymethodinvestments_1482" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1481" xlink:to="Locator_cmcsa_Goodwillimpairmentlossfromequitymethodinvestments_1482" order="21.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1483" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ComcastCorporationCapitalContributionCommitmentToEquityMethodInvestment" xlink:label="Locator_cmcsa_ComcastCorporationCapitalContributionCommitmentToEquityMethodInvestment_1484" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1483" xlink:to="Locator_cmcsa_ComcastCorporationCapitalContributionCommitmentToEquityMethodInvestment_1484" order="22.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1485" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ManagementCompanyCapitalContributionCommitmentToEquityMethodInvestment" xlink:label="Locator_cmcsa_ManagementCompanyCapitalContributionCommitmentToEquityMethodInvestment_1486" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1485" xlink:to="Locator_cmcsa_ManagementCompanyCapitalContributionCommitmentToEquityMethodInvestment_1486" order="23.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1487" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ThePercentageOfAnyLossesInAtairos" xlink:label="Locator_cmcsa_ThePercentageOfAnyLossesInAtairos_1488" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1487" xlink:to="Locator_cmcsa_ThePercentageOfAnyLossesInAtairos_1488" order="24.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1489" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ThePercentageOfAnyResidualReturnsInAtairos" xlink:label="Locator_cmcsa_ThePercentageOfAnyResidualReturnsInAtairos_1490" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1489" xlink:to="Locator_cmcsa_ThePercentageOfAnyResidualReturnsInAtairos_1490" order="25.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1493" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CapitalContributiontoVIE" xlink:label="Locator_cmcsa_CapitalContributiontoVIE_1494" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1493" xlink:to="Locator_cmcsa_CapitalContributiontoVIE_1494" order="27.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1495" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_PretaxGainOnSaleOfBusinessByInvestee" xlink:label="Locator_cmcsa_PretaxGainOnSaleOfBusinessByInvestee_1496" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1495" xlink:to="Locator_cmcsa_PretaxGainOnSaleOfBusinessByInvestee_1496" order="28.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1497" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ManagementFee" xlink:label="Locator_cmcsa_ManagementFee_1498" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1497" xlink:to="Locator_cmcsa_ManagementFee_1498" order="29.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1499" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_OtherCapitalContribution" xlink:label="Locator_cmcsa_OtherCapitalContribution_1500" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1499" xlink:to="Locator_cmcsa_OtherCapitalContribution_1500" order="30.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1501" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TermOfAgreement" xlink:label="Locator_cmcsa_TermOfAgreement_1502" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1501" xlink:to="Locator_cmcsa_TermOfAgreement_1502" order="31.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1491" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="Locator_us-gaap_IncomeLossFromEquityMethodInvestments_1492" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1491" xlink:to="Locator_us-gaap_IncomeLossFromEquityMethodInvestments_1492" order="26.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1413" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1414" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1413" xlink:to="Locator_us-gaap_StatementTable_1414" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureInvestmentsCostMethodInvestmentsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1541" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_1542" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1541" xlink:to="Locator_cmcsa_LegalEntity1Axis_1542" order="2.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_1543" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_1544" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_LegalEntity1Axis_1543" xlink:to="Locator_cmcsa_Entity1Domain_1544" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_1545" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1546" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_Entity1Domain_1545" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1546" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1547" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1548" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1547" xlink:to="Locator_dei_LegalEntityAxis_1548" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1549" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1550" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1549" xlink:to="Locator_dei_EntityDomain_1550" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1551" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_VoxMediaMember" xlink:label="Locator_cmcsa_VoxMediaMember_1552" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1551" xlink:to="Locator_cmcsa_VoxMediaMember_1552" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1553" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_BuzzFeedMember" xlink:label="Locator_cmcsa_BuzzFeedMember_1554" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1553" xlink:to="Locator_cmcsa_BuzzFeedMember_1554" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1555" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_AirTouchMember" xlink:label="Locator_cmcsa_AirTouchMember_1556" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1555" xlink:to="Locator_cmcsa_AirTouchMember_1556" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1557" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_PreferredSharesRedeemableInApril2020Member" xlink:label="Locator_cmcsa_PreferredSharesRedeemableInApril2020Member_1558" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1557" xlink:to="Locator_cmcsa_PreferredSharesRedeemableInApril2020Member_1558" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1559" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostMethodInvestmentsOriginalCost" xlink:label="Locator_us-gaap_CostMethodInvestmentsOriginalCost_1560" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1559" xlink:to="Locator_us-gaap_CostMethodInvestmentsOriginalCost_1560" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1561" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FairValueOfCostMethodInvestmentRedeemablePreferredShares" xlink:label="Locator_cmcsa_FairValueOfCostMethodInvestmentRedeemablePreferredShares_1562" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1561" xlink:to="Locator_cmcsa_FairValueOfCostMethodInvestmentRedeemablePreferredShares_1562" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1563" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_PreferredStockAggregateRedemptionValue" xlink:label="Locator_cmcsa_PreferredStockAggregateRedemptionValue_1564" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1563" xlink:to="Locator_cmcsa_PreferredStockAggregateRedemptionValue_1564" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1565" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CarryingAmountOfRedeemablePreferredStock" xlink:label="Locator_cmcsa_CarryingAmountOfRedeemablePreferredStock_1566" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1565" xlink:to="Locator_cmcsa_CarryingAmountOfRedeemablePreferredStock_1566" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1567" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NonredeemablePreferredStock" xlink:label="Locator_cmcsa_NonredeemablePreferredStock_1568" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1567" xlink:to="Locator_cmcsa_NonredeemablePreferredStock_1568" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1569" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FairValueAmountOfRedeemablePreferredShares" xlink:label="Locator_cmcsa_FairValueAmountOfRedeemablePreferredShares_1570" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1569" xlink:to="Locator_cmcsa_FairValueAmountOfRedeemablePreferredShares_1570" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1571" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1572" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1571" xlink:to="Locator_us-gaap_StatementTable_1572" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosurePropertyAndEquipmentDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1619" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1620" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1619" xlink:to="Locator_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1620" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1623" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1624" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1623" xlink:to="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1624" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1663" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1664" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1663" xlink:to="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1664" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1625" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CableDistributionSystemMember" xlink:label="Locator_cmcsa_CableDistributionSystemMember_1626" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1625" xlink:to="Locator_cmcsa_CableDistributionSystemMember_1626" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1627" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CustomerPremiseEquipmentMember" xlink:label="Locator_cmcsa_CustomerPremiseEquipmentMember_1628" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1627" xlink:to="Locator_cmcsa_CustomerPremiseEquipmentMember_1628" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1629" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember" xlink:label="Locator_us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember_1630" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1629" xlink:to="Locator_us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember_1630" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1631" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BuildingAndBuildingImprovementsMember" xlink:label="Locator_us-gaap_BuildingAndBuildingImprovementsMember_1632" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1631" xlink:to="Locator_us-gaap_BuildingAndBuildingImprovementsMember_1632" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1633" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FurnitureAndFixturesMember" xlink:label="Locator_us-gaap_FurnitureAndFixturesMember_1634" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1633" xlink:to="Locator_us-gaap_FurnitureAndFixturesMember_1634" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1635" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ComcastCenterMember" xlink:label="Locator_cmcsa_ComcastCenterMember_1636" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1635" xlink:to="Locator_cmcsa_ComcastCenterMember_1636" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1637" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_AcquisitionOfRealEstatePropertiesMember" xlink:label="Locator_cmcsa_AcquisitionOfRealEstatePropertiesMember_1638" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1637" xlink:to="Locator_cmcsa_AcquisitionOfRealEstatePropertiesMember_1638" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1621" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1622" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1621" xlink:to="Locator_dei_LegalEntityAxis_1622" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1639" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1640" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1639" xlink:to="Locator_dei_EntityDomain_1640" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1641" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1642" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1641" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1642" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1643" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentUsefulLife_1644" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1643" xlink:to="Locator_us-gaap_PropertyPlantAndEquipmentUsefulLife_1644" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1645" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CableDistributionSystems" xlink:label="Locator_cmcsa_CableDistributionSystems_1646" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1645" xlink:to="Locator_cmcsa_CableDistributionSystems_1646" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1647" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CustomerPremiseEquipment" xlink:label="Locator_cmcsa_CustomerPremiseEquipment_1648" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1647" xlink:to="Locator_cmcsa_CustomerPremiseEquipment_1648" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1649" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentOther" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentOther_1650" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1649" xlink:to="Locator_us-gaap_PropertyPlantAndEquipmentOther_1650" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1651" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BuildingsAndImprovementsGross" xlink:label="Locator_us-gaap_BuildingsAndImprovementsGross_1652" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1651" xlink:to="Locator_us-gaap_BuildingsAndImprovementsGross_1652" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1653" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Land" xlink:label="Locator_us-gaap_Land_1654" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1653" xlink:to="Locator_us-gaap_Land_1654" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1655" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MachineryAndEquipmentGross" xlink:label="Locator_us-gaap_MachineryAndEquipmentGross_1656" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1655" xlink:to="Locator_us-gaap_MachineryAndEquipmentGross_1656" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1657" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConstructionInProgressGross" xlink:label="Locator_us-gaap_ConstructionInProgressGross_1658" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1657" xlink:to="Locator_us-gaap_ConstructionInProgressGross_1658" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1659" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentGross_1660" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1659" xlink:to="Locator_us-gaap_PropertyPlantAndEquipmentGross_1660" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1661" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAdditions" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentAdditions_1662" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1661" xlink:to="Locator_us-gaap_PropertyPlantAndEquipmentAdditions_1662" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1615" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1616" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1615" xlink:to="Locator_us-gaap_StatementTable_1616" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureGoodwillRollforwardDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1709" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="Locator_us-gaap_StatementBusinessSegmentsAxis_1710" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1709" xlink:to="Locator_us-gaap_StatementBusinessSegmentsAxis_1710" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="Locator_us-gaap_StatementBusinessSegmentsAxis_1715" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_1716" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_StatementBusinessSegmentsAxis_1715" xlink:to="Locator_us-gaap_SegmentDomain_1716" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_1717" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CableCommunicationsMember" xlink:label="Locator_cmcsa_CableCommunicationsMember_1718" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_1717" xlink:to="Locator_cmcsa_CableCommunicationsMember_1718" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_1719" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CableNetworksMember" xlink:label="Locator_cmcsa_CableNetworksMember_1720" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_1719" xlink:to="Locator_cmcsa_CableNetworksMember_1720" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_1721" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_BroadcastTelevisionMember" xlink:label="Locator_cmcsa_BroadcastTelevisionMember_1722" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_1721" xlink:to="Locator_cmcsa_BroadcastTelevisionMember_1722" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_1723" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FilmedEntertainmentMember" xlink:label="Locator_cmcsa_FilmedEntertainmentMember_1724" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_1723" xlink:to="Locator_cmcsa_FilmedEntertainmentMember_1724" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_1725" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ThemeParksMember" xlink:label="Locator_cmcsa_ThemeParksMember_1726" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_1725" xlink:to="Locator_cmcsa_ThemeParksMember_1726" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_1727" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CorporateAndOtherMember" xlink:label="Locator_us-gaap_CorporateAndOtherMember_1728" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_1727" xlink:to="Locator_us-gaap_CorporateAndOtherMember_1728" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1711" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="Locator_us-gaap_BusinessAcquisitionAxis_1712" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1711" xlink:to="Locator_us-gaap_BusinessAcquisitionAxis_1712" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="Locator_us-gaap_BusinessAcquisitionAxis_1729" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_1730" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_BusinessAcquisitionAxis_1729" xlink:to="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_1730" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_1731" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_OtherAcquisitionsMember" xlink:label="Locator_cmcsa_OtherAcquisitionsMember_1732" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_1731" xlink:to="Locator_cmcsa_OtherAcquisitionsMember_1732" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1713" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1714" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1713" xlink:to="Locator_dei_LegalEntityAxis_1714" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1733" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1734" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1733" xlink:to="Locator_dei_EntityDomain_1734" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1735" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1736" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1735" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1736" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1739" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GoodwillAcquiredDuringPeriod" xlink:label="Locator_us-gaap_GoodwillAcquiredDuringPeriod_1740" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1739" xlink:to="Locator_us-gaap_GoodwillAcquiredDuringPeriod_1740" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1741" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit" xlink:label="Locator_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_1742" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1741" xlink:to="Locator_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_1742" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1743" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GoodwillOtherChanges" xlink:label="Locator_us-gaap_GoodwillOtherChanges_1744" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1743" xlink:to="Locator_us-gaap_GoodwillOtherChanges_1744" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1745" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GoodwillTranslationAdjustments" xlink:label="Locator_us-gaap_GoodwillTranslationAdjustments_1746" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1745" xlink:to="Locator_us-gaap_GoodwillTranslationAdjustments_1746" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1747" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GoodwillImpairmentLoss" xlink:label="Locator_us-gaap_GoodwillImpairmentLoss_1748" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1747" xlink:to="Locator_us-gaap_GoodwillImpairmentLoss_1748" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1737" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Goodwill" xlink:label="Locator_us-gaap_Goodwill_1738" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1737" xlink:to="Locator_us-gaap_Goodwill_1738" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1705" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1706" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1705" xlink:to="Locator_us-gaap_StatementTable_1706" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureLongTermDebtDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1799" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_1800" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1799" xlink:to="Locator_cmcsa_LegalEntity1Axis_1800" order="2.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_1801" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_1802" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_LegalEntity1Axis_1801" xlink:to="Locator_cmcsa_Entity1Domain_1802" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_1803" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1804" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_Entity1Domain_1803" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1804" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1797" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_1798" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1797" xlink:to="Locator_us-gaap_DebtInstrumentAxis_1798" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_1805" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_1806" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_DebtInstrumentAxis_1805" xlink:to="Locator_us-gaap_DebtInstrumentNameDomain_1806" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_1847" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_1848" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_DebtInstrumentAxis_1847" xlink:to="Locator_us-gaap_DebtInstrumentNameDomain_1848" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_1809" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_RevolvingBankCreditFacilityMember" xlink:label="Locator_cmcsa_RevolvingBankCreditFacilityMember_1810" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_1809" xlink:to="Locator_cmcsa_RevolvingBankCreditFacilityMember_1810" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_1813" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SeniorNotesWithMaturitiesOf5YearsOrLessatFaceValueMember" xlink:label="Locator_cmcsa_SeniorNotesWithMaturitiesOf5YearsOrLessatFaceValueMember_1814" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_1813" xlink:to="Locator_cmcsa_SeniorNotesWithMaturitiesOf5YearsOrLessatFaceValueMember_1814" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_1815" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SeniorNotesWithMaturitiesBetween5And10YearsatfacevalueMember" xlink:label="Locator_cmcsa_SeniorNotesWithMaturitiesBetween5And10YearsatfacevalueMember_1816" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_1815" xlink:to="Locator_cmcsa_SeniorNotesWithMaturitiesBetween5And10YearsatfacevalueMember_1816" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_1817" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SeniorNotesWithMaturitiesGreaterThan10YearsatfacevalueMember" xlink:label="Locator_cmcsa_SeniorNotesWithMaturitiesGreaterThan10YearsatfacevalueMember_1818" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_1817" xlink:to="Locator_cmcsa_SeniorNotesWithMaturitiesGreaterThan10YearsatfacevalueMember_1818" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_1819" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_OtherIncludingCapitalLeaseObligationsMember" xlink:label="Locator_cmcsa_OtherIncludingCapitalLeaseObligationsMember_1820" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_1819" xlink:to="Locator_cmcsa_OtherIncludingCapitalLeaseObligationsMember_1820" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_1821" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Notes550Due2029Member" xlink:label="Locator_cmcsa_Notes550Due2029Member_1822" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_1821" xlink:to="Locator_cmcsa_Notes550Due2029Member_1822" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_1823" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Senior8875NotesDue2015Member" xlink:label="Locator_cmcsa_Senior8875NotesDue2015Member_1824" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_1823" xlink:to="Locator_cmcsa_Senior8875NotesDue2015Member_1824" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_1825" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SeniorSubordinated10875NotesDue2016Member" xlink:label="Locator_cmcsa_SeniorSubordinated10875NotesDue2016Member_1826" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_1825" xlink:to="Locator_cmcsa_SeniorSubordinated10875NotesDue2016Member_1826" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_1811" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NbcuniversalEnterpriseCreditFacilityMember" xlink:label="Locator_cmcsa_NbcuniversalEnterpriseCreditFacilityMember_1812" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_1811" xlink:to="Locator_cmcsa_NbcuniversalEnterpriseCreditFacilityMember_1812" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_1807" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommercialPaperMember" xlink:label="Locator_us-gaap_CommercialPaperMember_1808" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_1807" xlink:to="Locator_us-gaap_CommercialPaperMember_1808" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_1831" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_UniversalStudiosJapanTermLoansMember" xlink:label="Locator_cmcsa_UniversalStudiosJapanTermLoansMember_1832" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_1831" xlink:to="Locator_cmcsa_UniversalStudiosJapanTermLoansMember_1832" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_1829" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Senior365NotesDue2015Member" xlink:label="Locator_cmcsa_Senior365NotesDue2015Member_1830" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_1829" xlink:to="Locator_cmcsa_Senior365NotesDue2015Member_1830" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_1827" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Senior650NotesDue2015Member" xlink:label="Locator_cmcsa_Senior650NotesDue2015Member_1828" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_1827" xlink:to="Locator_cmcsa_Senior650NotesDue2015Member_1828" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1837" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherLongTermDebt" xlink:label="Locator_us-gaap_OtherLongTermDebt_1838" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1837" xlink:to="Locator_us-gaap_OtherLongTermDebt_1838" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1839" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SeniorNotes" xlink:label="Locator_us-gaap_SeniorNotes_1840" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1839" xlink:to="Locator_us-gaap_SeniorNotes_1840" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1841" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherBorrowings" xlink:label="Locator_us-gaap_OtherBorrowings_1842" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1841" xlink:to="Locator_us-gaap_OtherBorrowings_1842" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1843" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Debtissuancecostspremiumsdiscountsadjustments" xlink:label="Locator_cmcsa_Debtissuancecostspremiumsdiscountsadjustments_1844" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1843" xlink:to="Locator_cmcsa_Debtissuancecostspremiumsdiscountsadjustments_1844" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1845" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtWeightedAverageInterestRate" xlink:label="Locator_us-gaap_DebtWeightedAverageInterestRate_1846" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1845" xlink:to="Locator_us-gaap_DebtWeightedAverageInterestRate_1846" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1833" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommercialPaper" xlink:label="Locator_us-gaap_CommercialPaper_1834" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1833" xlink:to="Locator_us-gaap_CommercialPaper_1834" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1835" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LineOfCredit" xlink:label="Locator_us-gaap_LineOfCredit_1836" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1835" xlink:to="Locator_us-gaap_LineOfCredit_1836" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1793" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1794" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1793" xlink:to="Locator_us-gaap_StatementTable_1794" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureLongTermDebtDebtMaturitiesDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1917" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1918" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1917" xlink:to="Locator_dei_LegalEntityAxis_1918" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1919" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1920" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1919" xlink:to="Locator_dei_EntityDomain_1920" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1921" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1922" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1921" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1922" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1901" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_1902" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1901" xlink:to="Locator_us-gaap_DebtInstrumentAxis_1902" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_1903" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_1904" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_DebtInstrumentAxis_1903" xlink:to="Locator_us-gaap_DebtInstrumentNameDomain_1904" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_1905" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DueInOneYearMember" xlink:label="Locator_cmcsa_DueInOneYearMember_1906" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_1905" xlink:to="Locator_cmcsa_DueInOneYearMember_1906" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_1907" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DueInTwoYearsMember" xlink:label="Locator_cmcsa_DueInTwoYearsMember_1908" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_1907" xlink:to="Locator_cmcsa_DueInTwoYearsMember_1908" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_1909" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DueInThreeYearsMember" xlink:label="Locator_cmcsa_DueInThreeYearsMember_1910" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_1909" xlink:to="Locator_cmcsa_DueInThreeYearsMember_1910" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_1911" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DueInFourYearsMember" xlink:label="Locator_cmcsa_DueInFourYearsMember_1912" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_1911" xlink:to="Locator_cmcsa_DueInFourYearsMember_1912" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_1913" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DueInFiveYearsMember" xlink:label="Locator_cmcsa_DueInFiveYearsMember_1914" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_1913" xlink:to="Locator_cmcsa_DueInFiveYearsMember_1914" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_1915" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ThereafterMember" xlink:label="Locator_cmcsa_ThereafterMember_1916" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_1915" xlink:to="Locator_cmcsa_ThereafterMember_1916" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1923" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths" xlink:label="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_1924" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1923" xlink:to="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_1924" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1925" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo" xlink:label="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_1926" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1925" xlink:to="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_1926" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1927" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree" xlink:label="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_1928" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1927" xlink:to="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_1928" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1929" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour" xlink:label="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_1930" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1929" xlink:to="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_1930" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1931" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive" xlink:label="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_1932" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1931" xlink:to="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_1932" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1933" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive" xlink:label="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_1934" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1933" xlink:to="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_1934" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1935" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtWeightedAverageInterestRate" xlink:label="Locator_us-gaap_DebtWeightedAverageInterestRate_1936" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1935" xlink:to="Locator_us-gaap_DebtWeightedAverageInterestRate_1936" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1937" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1938" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1937" xlink:to="Locator_us-gaap_StatementTable_1938" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/LongTermDebtNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2019" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_2020" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2019" xlink:to="Locator_cmcsa_LegalEntity1Axis_2020" order="3.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_2021" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_2022" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_LegalEntity1Axis_2021" xlink:to="Locator_cmcsa_Entity1Domain_2022" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_2023" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_2024" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_Entity1Domain_2023" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_2024" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2017" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2018" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2017" xlink:to="Locator_dei_LegalEntityAxis_2018" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2051" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2052" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_2051" xlink:to="Locator_dei_EntityDomain_2052" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2053" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NbcuniversalEnterpriseMember" xlink:label="Locator_cmcsa_NbcuniversalEnterpriseMember_2054" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2053" xlink:to="Locator_cmcsa_NbcuniversalEnterpriseMember_2054" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2015" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_2016" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2015" xlink:to="Locator_us-gaap_DebtInstrumentAxis_2016" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_2025" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2026" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_DebtInstrumentAxis_2025" xlink:to="Locator_us-gaap_DebtInstrumentNameDomain_2026" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2027" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ComcastrevolvingcreditfacilityMember" xlink:label="Locator_cmcsa_ComcastrevolvingcreditfacilityMember_2028" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2027" xlink:to="Locator_cmcsa_ComcastrevolvingcreditfacilityMember_2028" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2029" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NbcuniversalEnterpriseCreditFacilityMember" xlink:label="Locator_cmcsa_NbcuniversalEnterpriseCreditFacilityMember_2030" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2029" xlink:to="Locator_cmcsa_NbcuniversalEnterpriseCreditFacilityMember_2030" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2031" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FormercomcastandcomcastcablecommunicationsllcrevolvingcreditfacilitymemberMember" xlink:label="Locator_cmcsa_FormercomcastandcomcastcablecommunicationsllcrevolvingcreditfacilitymemberMember_2032" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2031" xlink:to="Locator_cmcsa_FormercomcastandcomcastcablecommunicationsllcrevolvingcreditfacilitymemberMember_2032" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2033" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FormernbcuniversalenterprisecreditfacilitymemberMember" xlink:label="Locator_cmcsa_FormernbcuniversalenterprisecreditfacilitymemberMember_2034" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2033" xlink:to="Locator_cmcsa_FormernbcuniversalenterprisecreditfacilitymemberMember_2034" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2037" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommercialPaperMember" xlink:label="Locator_us-gaap_CommercialPaperMember_2038" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2037" xlink:to="Locator_us-gaap_CommercialPaperMember_2038" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2039" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ComcastAndComcastCableDebtSecuritiesMember" xlink:label="Locator_cmcsa_ComcastAndComcastCableDebtSecuritiesMember_2040" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2039" xlink:to="Locator_cmcsa_ComcastAndComcastCableDebtSecuritiesMember_2040" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2041" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Senior5NotesDue2061Member" xlink:label="Locator_cmcsa_Senior5NotesDue2061Member_2042" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2041" xlink:to="Locator_cmcsa_Senior5NotesDue2061Member_2042" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2043" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GuaranteeOfIndebtednessOfOthersMember" xlink:label="Locator_us-gaap_GuaranteeOfIndebtednessOfOthersMember_2044" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2043" xlink:to="Locator_us-gaap_GuaranteeOfIndebtednessOfOthersMember_2044" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2045" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_UnusedLinesOfCreditMember" xlink:label="Locator_us-gaap_UnusedLinesOfCreditMember_2046" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2045" xlink:to="Locator_us-gaap_UnusedLinesOfCreditMember_2046" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2047" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NbcuniversalEnterpriseCommercialPaperMember" xlink:label="Locator_cmcsa_NbcuniversalEnterpriseCommercialPaperMember_2048" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2047" xlink:to="Locator_cmcsa_NbcuniversalEnterpriseCommercialPaperMember_2048" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2049" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_UniversalStudiosJapanTermLoansMember" xlink:label="Locator_cmcsa_UniversalStudiosJapanTermLoansMember_2050" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2049" xlink:to="Locator_cmcsa_UniversalStudiosJapanTermLoansMember_2050" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2035" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_OtherLongTermDebtMember" xlink:label="Locator_cmcsa_OtherLongTermDebtMember_2036" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2035" xlink:to="Locator_cmcsa_OtherLongTermDebtMember_2036" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2055" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtAndCapitalLeaseObligations" xlink:label="Locator_us-gaap_DebtAndCapitalLeaseObligations_2056" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2055" xlink:to="Locator_us-gaap_DebtAndCapitalLeaseObligations_2056" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2057" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebtFairValue" xlink:label="Locator_us-gaap_LongTermDebtFairValue_2058" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2057" xlink:to="Locator_us-gaap_LongTermDebtFairValue_2058" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2059" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="Locator_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2060" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2059" xlink:to="Locator_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2060" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2063" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_LineOfCreditFacilityPotentialIncreasedToMaximumBorrowingCapacity" xlink:label="Locator_cmcsa_LineOfCreditFacilityPotentialIncreasedToMaximumBorrowingCapacity_2064" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2063" xlink:to="Locator_cmcsa_LineOfCreditFacilityPotentialIncreasedToMaximumBorrowingCapacity_2064" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2065" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Creditfacilitydebtinstrumentmaturitydatedescription" xlink:label="Locator_cmcsa_Creditfacilitydebtinstrumentmaturitydatedescription_2066" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2065" xlink:to="Locator_cmcsa_Creditfacilitydebtinstrumentmaturitydatedescription_2066" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2069" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="Locator_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_2070" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2069" xlink:to="Locator_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_2070" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2071" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommercialPaper" xlink:label="Locator_us-gaap_CommercialPaper_2072" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2071" xlink:to="Locator_us-gaap_CommercialPaper_2072" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2073" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="Locator_us-gaap_LettersOfCreditOutstandingAmount_2074" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2073" xlink:to="Locator_us-gaap_LettersOfCreditOutstandingAmount_2074" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2075" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ComcastOwnershipInCableHoldingCompanySubsidiaries" xlink:label="Locator_cmcsa_ComcastOwnershipInCableHoldingCompanySubsidiaries_2076" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2075" xlink:to="Locator_cmcsa_ComcastOwnershipInCableHoldingCompanySubsidiaries_2076" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2077" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LineOfCredit" xlink:label="Locator_us-gaap_LineOfCredit_2078" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2077" xlink:to="Locator_us-gaap_LineOfCredit_2078" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2085" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromRepaymentsOfCommercialPaper" xlink:label="Locator_us-gaap_ProceedsFromRepaymentsOfCommercialPaper_2086" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2085" xlink:to="Locator_us-gaap_ProceedsFromRepaymentsOfCommercialPaper_2086" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2089" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_GuaranteeObligationsRevolvingCreditFacility" xlink:label="Locator_cmcsa_GuaranteeObligationsRevolvingCreditFacility_2090" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2089" xlink:to="Locator_cmcsa_GuaranteeObligationsRevolvingCreditFacility_2090" order="18.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2091" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_RelatedPartyAggregatePrincipalAmountSeniorNotesNotSubjectToGuarantee" xlink:label="Locator_cmcsa_RelatedPartyAggregatePrincipalAmountSeniorNotesNotSubjectToGuarantee_2092" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2091" xlink:to="Locator_cmcsa_RelatedPartyAggregatePrincipalAmountSeniorNotesNotSubjectToGuarantee_2092" order="19.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2093" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_RelatedPartyCreditFacilityNotSubjectToGuarantee" xlink:label="Locator_cmcsa_RelatedPartyCreditFacilityNotSubjectToGuarantee_2094" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2093" xlink:to="Locator_cmcsa_RelatedPartyCreditFacilityNotSubjectToGuarantee_2094" order="20.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2095" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_RelatedPartyLiquidationPreferencePreferredStockNotSubjectToGuarantee" xlink:label="Locator_cmcsa_RelatedPartyLiquidationPreferencePreferredStockNotSubjectToGuarantee_2096" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2095" xlink:to="Locator_cmcsa_RelatedPartyLiquidationPreferencePreferredStockNotSubjectToGuarantee_2096" order="21.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2099" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Commercialpapercapacity" xlink:label="Locator_cmcsa_Commercialpapercapacity_2100" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2099" xlink:to="Locator_cmcsa_Commercialpapercapacity_2100" order="23.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2081" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PreferredStockLiquidationPreferenceValue" xlink:label="Locator_us-gaap_PreferredStockLiquidationPreferenceValue_2082" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2081" xlink:to="Locator_us-gaap_PreferredStockLiquidationPreferenceValue_2082" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2067" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="Locator_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_2068" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2067" xlink:to="Locator_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_2068" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2079" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="Locator_us-gaap_DebtInstrumentFaceAmount_2080" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2079" xlink:to="Locator_us-gaap_DebtInstrumentFaceAmount_2080" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2097" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt" xlink:label="Locator_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_2098" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2097" xlink:to="Locator_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_2098" order="22.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2061" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentMaturityDateDescription" xlink:label="Locator_us-gaap_DebtInstrumentMaturityDateDescription_2062" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2061" xlink:to="Locator_us-gaap_DebtInstrumentMaturityDateDescription_2062" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2087" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_GuaranteeObligationsCurrentPrincipalBalance" xlink:label="Locator_cmcsa_GuaranteeObligationsCurrentPrincipalBalance_2088" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2087" xlink:to="Locator_cmcsa_GuaranteeObligationsCurrentPrincipalBalance_2088" order="17.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2083" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="Locator_us-gaap_DebtInstrumentInterestRateStatedPercentage_2084" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2083" xlink:to="Locator_us-gaap_DebtInstrumentInterestRateStatedPercentage_2084" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2011" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2012" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2011" xlink:to="Locator_us-gaap_StatementTable_2012" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureFairValueMeasurementsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2199" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="Locator_us-gaap_FairValueByFairValueHierarchyLevelAxis_2200" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2199" xlink:to="Locator_us-gaap_FairValueByFairValueHierarchyLevelAxis_2200" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="Locator_us-gaap_FairValueByFairValueHierarchyLevelAxis_2201" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="Locator_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2202" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_FairValueByFairValueHierarchyLevelAxis_2201" xlink:to="Locator_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2202" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="Locator_us-gaap_FairValueByFairValueHierarchyLevelAxis_2203" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="Locator_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2204" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_FairValueByFairValueHierarchyLevelAxis_2203" xlink:to="Locator_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2204" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="Locator_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2205" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="Locator_us-gaap_FairValueInputsLevel1Member_2206" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2205" xlink:to="Locator_us-gaap_FairValueInputsLevel1Member_2206" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="Locator_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2207" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="Locator_us-gaap_FairValueInputsLevel2Member_2208" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2207" xlink:to="Locator_us-gaap_FairValueInputsLevel2Member_2208" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="Locator_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2209" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="Locator_us-gaap_FairValueInputsLevel3Member_2210" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2209" xlink:to="Locator_us-gaap_FairValueInputsLevel3Member_2210" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2211" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TradingSecurities" xlink:label="Locator_us-gaap_TradingSecurities_2212" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2211" xlink:to="Locator_us-gaap_TradingSecurities_2212" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2213" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecurities" xlink:label="Locator_us-gaap_AvailableForSaleSecurities_2214" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2213" xlink:to="Locator_us-gaap_AvailableForSaleSecurities_2214" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2215" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_EquityWarrantsFairValueDisclosure" xlink:label="Locator_cmcsa_EquityWarrantsFairValueDisclosure_2216" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2215" xlink:to="Locator_cmcsa_EquityWarrantsFairValueDisclosure_2216" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2217" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InterestRateDerivativeAssetsAtFairValue" xlink:label="Locator_us-gaap_InterestRateDerivativeAssetsAtFairValue_2218" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2217" xlink:to="Locator_us-gaap_InterestRateDerivativeAssetsAtFairValue_2218" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2219" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ForeignCurrencyContractAssetFairValueDisclosure" xlink:label="Locator_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_2220" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2219" xlink:to="Locator_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_2220" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2221" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherAssetsFairValueDisclosure" xlink:label="Locator_us-gaap_OtherAssetsFairValueDisclosure_2222" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2221" xlink:to="Locator_us-gaap_OtherAssetsFairValueDisclosure_2222" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2223" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset" xlink:label="Locator_us-gaap_DerivativeFairValueOfDerivativeAsset_2224" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2223" xlink:to="Locator_us-gaap_DerivativeFairValueOfDerivativeAsset_2224" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2225" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsFairValueDisclosure" xlink:label="Locator_us-gaap_AssetsFairValueDisclosure_2226" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2225" xlink:to="Locator_us-gaap_AssetsFairValueDisclosure_2226" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2227" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DerivativeFairValueOfEmbeddedDerivativeLiabilityComponentOfPrepaidForwardSaleAgreementsAndIndexedDebtInstruments" xlink:label="Locator_cmcsa_DerivativeFairValueOfEmbeddedDerivativeLiabilityComponentOfPrepaidForwardSaleAgreementsAndIndexedDebtInstruments_2228" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2227" xlink:to="Locator_cmcsa_DerivativeFairValueOfEmbeddedDerivativeLiabilityComponentOfPrepaidForwardSaleAgreementsAndIndexedDebtInstruments_2228" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2229" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations" xlink:label="Locator_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations_2230" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2229" xlink:to="Locator_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations_2230" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2231" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability" xlink:label="Locator_us-gaap_BusinessCombinationContingentConsiderationLiability_2232" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2231" xlink:to="Locator_us-gaap_BusinessCombinationContingentConsiderationLiability_2232" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2233" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability" xlink:label="Locator_us-gaap_DerivativeFairValueOfDerivativeLiability_2234" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2233" xlink:to="Locator_us-gaap_DerivativeFairValueOfDerivativeLiability_2234" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2235" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure" xlink:label="Locator_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_2236" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2235" xlink:to="Locator_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_2236" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2237" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherLiabilitiesFairValueDisclosure" xlink:label="Locator_us-gaap_OtherLiabilitiesFairValueDisclosure_2238" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2237" xlink:to="Locator_us-gaap_OtherLiabilitiesFairValueDisclosure_2238" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2239" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosure" xlink:label="Locator_us-gaap_LiabilitiesFairValueDisclosure_2240" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2239" xlink:to="Locator_us-gaap_LiabilitiesFairValueDisclosure_2240" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2241" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2242" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2241" xlink:to="Locator_us-gaap_StatementTable_2242" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureNoncontrollingInterestsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2261" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2262" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2261" xlink:to="Locator_dei_LegalEntityAxis_2262" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2263" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2264" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_2263" xlink:to="Locator_dei_EntityDomain_2264" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2265" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_RedemptionTransactionMember" xlink:label="Locator_cmcsa_RedemptionTransactionMember_2266" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2265" xlink:to="Locator_cmcsa_RedemptionTransactionMember_2266" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2267" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_OtherPurchaseMember" xlink:label="Locator_cmcsa_OtherPurchaseMember_2268" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2267" xlink:to="Locator_cmcsa_OtherPurchaseMember_2268" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2257" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2258" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2257" xlink:to="Locator_us-gaap_StatementTable_2258" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefitsNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2301" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2302" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2301" xlink:to="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2302" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2305" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2306" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2305" xlink:to="Locator_us-gaap_DefinedBenefitPlansDomain_2306" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2341" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2342" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2341" xlink:to="Locator_us-gaap_DefinedBenefitPlansDomain_2342" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2313" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_RetirementInvestmentPlansMember" xlink:label="Locator_cmcsa_RetirementInvestmentPlansMember_2314" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlansDomain_2313" xlink:to="Locator_cmcsa_RetirementInvestmentPlansMember_2314" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2315" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NbcuniversalQualifiedPensionPlanMember" xlink:label="Locator_cmcsa_NbcuniversalQualifiedPensionPlanMember_2316" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlansDomain_2315" xlink:to="Locator_cmcsa_NbcuniversalQualifiedPensionPlanMember_2316" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2317" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_PostretirementAndOtherBenefitsMember" xlink:label="Locator_cmcsa_PostretirementAndOtherBenefitsMember_2318" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlansDomain_2317" xlink:to="Locator_cmcsa_PostretirementAndOtherBenefitsMember_2318" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2311" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DeferredCompensationPlansMember" xlink:label="Locator_cmcsa_DeferredCompensationPlansMember_2312" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlansDomain_2311" xlink:to="Locator_cmcsa_DeferredCompensationPlansMember_2312" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2307" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="Locator_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_2308" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlansDomain_2307" xlink:to="Locator_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_2308" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2309" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="Locator_us-gaap_PensionPlansDefinedBenefitMember_2310" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlansDomain_2309" xlink:to="Locator_us-gaap_PensionPlansDefinedBenefitMember_2310" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2303" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2304" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2303" xlink:to="Locator_dei_LegalEntityAxis_2304" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2319" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2320" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_2319" xlink:to="Locator_dei_EntityDomain_2320" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2321" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_2322" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2321" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_2322" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2323" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_MaximumContributionRequiredToFullyFundAndSettlePensionPlan" xlink:label="Locator_cmcsa_MaximumContributionRequiredToFullyFundAndSettlePensionPlan_2324" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2323" xlink:to="Locator_cmcsa_MaximumContributionRequiredToFullyFundAndSettlePensionPlan_2324" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2325" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MultiemployerPlanPeriodContributions" xlink:label="Locator_us-gaap_MultiemployerPlanPeriodContributions_2326" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2325" xlink:to="Locator_us-gaap_MultiemployerPlanPeriodContributions_2326" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2327" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashSurrenderValueOfLifeInsurance" xlink:label="Locator_us-gaap_CashSurrenderValueOfLifeInsurance_2328" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2327" xlink:to="Locator_us-gaap_CashSurrenderValueOfLifeInsurance_2328" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2329" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedContributionPlanCostRecognized" xlink:label="Locator_us-gaap_DefinedContributionPlanCostRecognized_2330" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2329" xlink:to="Locator_us-gaap_DefinedContributionPlanCostRecognized_2330" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2331" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SeveranceCosts1" xlink:label="Locator_us-gaap_SeveranceCosts1_2332" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2331" xlink:to="Locator_us-gaap_SeveranceCosts1_2332" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2333" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MultiemployerPlansFundedStatus" xlink:label="Locator_us-gaap_MultiemployerPlansFundedStatus_2334" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2333" xlink:to="Locator_us-gaap_MultiemployerPlansFundedStatus_2334" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2335" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets" xlink:label="Locator_us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets_2336" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2335" xlink:to="Locator_us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets_2336" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2337" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanSettlementsPlanAssets" xlink:label="Locator_us-gaap_DefinedBenefitPlanSettlementsPlanAssets_2338" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2337" xlink:to="Locator_us-gaap_DefinedBenefitPlanSettlementsPlanAssets_2338" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2339" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax_2340" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2339" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax_2340" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2297" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2298" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2297" xlink:to="Locator_us-gaap_StatementTable_2298" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefitsInformationOnOurPensionBenefitPlansDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2387" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeAxis" xlink:label="Locator_us-gaap_RangeAxis_2388" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2387" xlink:to="Locator_us-gaap_RangeAxis_2388" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeAxis" xlink:label="Locator_us-gaap_RangeAxis_2391" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_RangeDomain" xlink:label="Locator_cmcsa_RangeDomain_2392" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_RangeAxis_2391" xlink:to="Locator_cmcsa_RangeDomain_2392" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeAxis" xlink:label="Locator_us-gaap_RangeAxis_2421" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_RangeDomain" xlink:label="Locator_cmcsa_RangeDomain_2422" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_RangeAxis_2421" xlink:to="Locator_cmcsa_RangeDomain_2422" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_RangeDomain" xlink:label="Locator_cmcsa_RangeDomain_2393" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MinimumMember" xlink:label="Locator_us-gaap_MinimumMember_2394" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_RangeDomain_2393" xlink:to="Locator_us-gaap_MinimumMember_2394" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_RangeDomain" xlink:label="Locator_cmcsa_RangeDomain_2395" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MaximumMember" xlink:label="Locator_us-gaap_MaximumMember_2396" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_RangeDomain_2395" xlink:to="Locator_us-gaap_MaximumMember_2396" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2385" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2386" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2385" xlink:to="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2386" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2397" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2398" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2397" xlink:to="Locator_us-gaap_DefinedBenefitPlansDomain_2398" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2401" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="Locator_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_2402" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlansDomain_2401" xlink:to="Locator_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_2402" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2399" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="Locator_us-gaap_PensionPlansDefinedBenefitMember_2400" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlansDomain_2399" xlink:to="Locator_us-gaap_PensionPlansDefinedBenefitMember_2400" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2389" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2390" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2389" xlink:to="Locator_dei_LegalEntityAxis_2390" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2403" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2404" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_2403" xlink:to="Locator_dei_EntityDomain_2404" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2405" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_2406" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2405" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_2406" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2407" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligation" xlink:label="Locator_us-gaap_DefinedBenefitPlanBenefitObligation_2408" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2407" xlink:to="Locator_us-gaap_DefinedBenefitPlanBenefitObligation_2408" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2409" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets" xlink:label="Locator_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_2410" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2409" xlink:to="Locator_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_2410" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2411" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan" xlink:label="Locator_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_2412" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2411" xlink:to="Locator_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_2412" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2413" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax" xlink:label="Locator_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_2414" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2413" xlink:to="Locator_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_2414" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2415" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PensionAndOtherPostretirementBenefitExpense" xlink:label="Locator_us-gaap_PensionAndOtherPostretirementBenefitExpense_2416" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2415" xlink:to="Locator_us-gaap_PensionAndOtherPostretirementBenefitExpense_2416" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2417" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate" xlink:label="Locator_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_2418" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2417" xlink:to="Locator_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_2418" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2419" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets" xlink:label="Locator_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_2420" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2419" xlink:to="Locator_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_2420" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2381" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2382" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2381" xlink:to="Locator_us-gaap_StatementTable_2382" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefitsDeferredCompensationPlansDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2451" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2452" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2451" xlink:to="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2452" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2453" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2454" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2453" xlink:to="Locator_us-gaap_DefinedBenefitPlansDomain_2454" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2455" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DeferredCompensationPlansMember" xlink:label="Locator_cmcsa_DeferredCompensationPlansMember_2456" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlansDomain_2455" xlink:to="Locator_cmcsa_DeferredCompensationPlansMember_2456" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2457" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2458" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2457" xlink:to="Locator_dei_LegalEntityAxis_2458" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2459" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2460" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_2459" xlink:to="Locator_dei_EntityDomain_2460" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2461" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_2462" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2461" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_2462" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2463" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DeferredCompensationPlansBenefitObligation" xlink:label="Locator_cmcsa_DeferredCompensationPlansBenefitObligation_2464" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2463" xlink:to="Locator_cmcsa_DeferredCompensationPlansBenefitObligation_2464" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2465" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DeferredCompensationPlansInterestCost" xlink:label="Locator_cmcsa_DeferredCompensationPlansInterestCost_2466" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2465" xlink:to="Locator_cmcsa_DeferredCompensationPlansInterestCost_2466" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2467" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2468" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2467" xlink:to="Locator_us-gaap_StatementTable_2468" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureEquityNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2507" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareRepurchaseProgramAxis" xlink:label="Locator_us-gaap_ShareRepurchaseProgramAxis_2508" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2507" xlink:to="Locator_us-gaap_ShareRepurchaseProgramAxis_2508" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareRepurchaseProgramAxis" xlink:label="Locator_us-gaap_ShareRepurchaseProgramAxis_2509" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain" xlink:label="Locator_us-gaap_ShareRepurchaseProgramDomain_2510" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_ShareRepurchaseProgramAxis_2509" xlink:to="Locator_us-gaap_ShareRepurchaseProgramDomain_2510" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareRepurchaseProgramAxis" xlink:label="Locator_us-gaap_ShareRepurchaseProgramAxis_2533" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain" xlink:label="Locator_us-gaap_ShareRepurchaseProgramDomain_2534" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_ShareRepurchaseProgramAxis_2533" xlink:to="Locator_us-gaap_ShareRepurchaseProgramDomain_2534" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain" xlink:label="Locator_us-gaap_ShareRepurchaseProgramDomain_2511" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ExistingAuthorizationMember" xlink:label="Locator_cmcsa_ExistingAuthorizationMember_2512" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ShareRepurchaseProgramDomain_2511" xlink:to="Locator_cmcsa_ExistingAuthorizationMember_2512" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain" xlink:label="Locator_us-gaap_ShareRepurchaseProgramDomain_2513" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NewAuthorizationMember" xlink:label="Locator_cmcsa_NewAuthorizationMember_2514" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ShareRepurchaseProgramDomain_2513" xlink:to="Locator_cmcsa_NewAuthorizationMember_2514" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2503" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="Locator_us-gaap_StatementClassOfStockAxis_2504" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2503" xlink:to="Locator_us-gaap_StatementClassOfStockAxis_2504" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="Locator_us-gaap_StatementClassOfStockAxis_2515" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_2516" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_StatementClassOfStockAxis_2515" xlink:to="Locator_us-gaap_ClassOfStockDomain_2516" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_2517" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="Locator_us-gaap_CommonClassAMember_2518" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_2517" xlink:to="Locator_us-gaap_CommonClassAMember_2518" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_2519" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="Locator_us-gaap_CommonClassBMember_2520" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_2519" xlink:to="Locator_us-gaap_CommonClassBMember_2520" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2505" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2506" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2505" xlink:to="Locator_dei_LegalEntityAxis_2506" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2521" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2522" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_2521" xlink:to="Locator_dei_EntityDomain_2522" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2523" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_2524" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2523" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_2524" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2525" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CommonStockVotingPower" xlink:label="Locator_cmcsa_CommonStockVotingPower_2526" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2525" xlink:to="Locator_cmcsa_CommonStockVotingPower_2526" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2527" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NumberOfVotesEntitledOfEachClassBCommonStock" xlink:label="Locator_cmcsa_NumberOfVotesEntitledOfEachClassBCommonStock_2528" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2527" xlink:to="Locator_cmcsa_NumberOfVotesEntitledOfEachClassBCommonStock_2528" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2529" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount1" xlink:label="Locator_us-gaap_StockRepurchaseProgramAuthorizedAmount1_2530" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2529" xlink:to="Locator_us-gaap_StockRepurchaseProgramAuthorizedAmount1_2530" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2531" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1" xlink:label="Locator_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_2532" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2531" xlink:to="Locator_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_2532" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2493" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2494" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2493" xlink:to="Locator_us-gaap_StatementTable_2494" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureEquityChangesInCommonStockDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2575" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="Locator_us-gaap_StatementClassOfStockAxis_2576" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2575" xlink:to="Locator_us-gaap_StatementClassOfStockAxis_2576" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="Locator_us-gaap_StatementClassOfStockAxis_2577" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_2578" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_StatementClassOfStockAxis_2577" xlink:to="Locator_us-gaap_ClassOfStockDomain_2578" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_2579" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="Locator_us-gaap_CommonClassAMember_2580" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_2579" xlink:to="Locator_us-gaap_CommonClassAMember_2580" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_2581" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ClassaSpecialCommonStockMember" xlink:label="Locator_cmcsa_ClassaSpecialCommonStockMember_2582" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_2581" xlink:to="Locator_cmcsa_ClassaSpecialCommonStockMember_2582" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_2583" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="Locator_us-gaap_CommonClassBMember_2584" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_2583" xlink:to="Locator_us-gaap_CommonClassBMember_2584" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2585" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" xlink:label="Locator_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_2586" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2585" xlink:to="Locator_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_2586" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2587" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares" xlink:label="Locator_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_2588" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2587" xlink:to="Locator_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_2588" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2589" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans" xlink:label="Locator_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_2590" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2589" xlink:to="Locator_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_2590" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2591" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ShareReclassificationOfClassASpecialCommonStock" xlink:label="Locator_cmcsa_ShareReclassificationOfClassASpecialCommonStock_2592" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2591" xlink:to="Locator_cmcsa_ShareReclassificationOfClassASpecialCommonStock_2592" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2593" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesOther" xlink:label="Locator_us-gaap_StockIssuedDuringPeriodSharesOther_2594" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2593" xlink:to="Locator_us-gaap_StockIssuedDuringPeriodSharesOther_2594" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2595" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ShareExchangeIssuedReceived" xlink:label="Locator_cmcsa_ShareExchangeIssuedReceived_2596" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2595" xlink:to="Locator_cmcsa_ShareExchangeIssuedReceived_2596" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2571" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2572" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2571" xlink:to="Locator_us-gaap_StatementTable_2572" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureEquityComponentsOfAccumulatedOtherComprehensiveIncomeLossDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2613" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2614" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2613" xlink:to="Locator_dei_LegalEntityAxis_2614" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2615" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2616" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_2615" xlink:to="Locator_dei_EntityDomain_2616" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2609" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2610" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2609" xlink:to="Locator_us-gaap_StatementTable_2610" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureShareBasedCompensationRecognizedShareBasedCompensationExpenseDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2631" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="Locator_us-gaap_AwardTypeAxis_2632" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2631" xlink:to="Locator_us-gaap_AwardTypeAxis_2632" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="Locator_us-gaap_AwardTypeAxis_2635" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2636" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_AwardTypeAxis_2635" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2636" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2641" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EmployeeStockMember" xlink:label="Locator_us-gaap_EmployeeStockMember_2642" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2641" xlink:to="Locator_us-gaap_EmployeeStockMember_2642" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2637" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="Locator_us-gaap_RestrictedStockUnitsRSUMember_2638" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2637" xlink:to="Locator_us-gaap_RestrictedStockUnitsRSUMember_2638" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2639" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="Locator_us-gaap_EmployeeStockOptionMember_2640" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2639" xlink:to="Locator_us-gaap_EmployeeStockOptionMember_2640" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2633" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2634" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2633" xlink:to="Locator_dei_LegalEntityAxis_2634" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2643" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2644" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_2643" xlink:to="Locator_dei_EntityDomain_2644" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2645" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_2646" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2645" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_2646" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2647" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="Locator_us-gaap_AllocatedShareBasedCompensationExpense_2648" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2647" xlink:to="Locator_us-gaap_AllocatedShareBasedCompensationExpense_2648" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2649" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense" xlink:label="Locator_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_2650" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2649" xlink:to="Locator_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_2650" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2627" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2628" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2627" xlink:to="Locator_us-gaap_StatementTable_2628" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureShareBasedCompensationRestrictedShareUnitsAndStockOptionFairValueDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2681" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2682" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2681" xlink:to="Locator_dei_LegalEntityAxis_2682" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2683" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2684" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_2683" xlink:to="Locator_dei_EntityDomain_2684" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2685" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_2686" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2685" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_2686" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2687" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_2688" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2687" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_2688" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2689" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_2690" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2689" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_2690" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2691" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_2692" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2691" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_2692" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2693" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_2694" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2693" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_2694" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2695" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="Locator_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_2696" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2695" xlink:to="Locator_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_2696" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2697" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_2698" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2697" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_2698" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2699" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2700" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2699" xlink:to="Locator_us-gaap_StatementTable_2700" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureShareBasedCompensationStockOptionsAndRestrictedShareUnitsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2729" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="Locator_us-gaap_AwardTypeAxis_2730" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2729" xlink:to="Locator_us-gaap_AwardTypeAxis_2730" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="Locator_us-gaap_AwardTypeAxis_2731" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2732" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_AwardTypeAxis_2731" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2732" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="Locator_us-gaap_AwardTypeAxis_2749" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2750" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_AwardTypeAxis_2749" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2750" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2733" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NetSettledOptionsMember" xlink:label="Locator_cmcsa_NetSettledOptionsMember_2734" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2733" xlink:to="Locator_cmcsa_NetSettledOptionsMember_2734" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2735" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_2736" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2735" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_2736" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2737" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_2738" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2737" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_2738" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2739" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_2740" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2739" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_2740" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2741" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_2742" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2741" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_2742" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2743" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_2744" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2743" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_2744" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2745" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_2746" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2745" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_2746" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2747" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_2748" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2747" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_2748" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2725" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2726" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2725" xlink:to="Locator_us-gaap_StatementTable_2726" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureIncomeTaxesComponentsOfIncomeTaxExpenseDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2787" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2788" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2787" xlink:to="Locator_dei_LegalEntityAxis_2788" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2789" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2790" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_2789" xlink:to="Locator_dei_EntityDomain_2790" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2791" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_2792" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2791" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_2792" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2793" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CurrentFederalTaxExpenseBenefit" xlink:label="Locator_us-gaap_CurrentFederalTaxExpenseBenefit_2794" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2793" xlink:to="Locator_us-gaap_CurrentFederalTaxExpenseBenefit_2794" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2795" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CurrentStateAndLocalTaxExpenseBenefit" xlink:label="Locator_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_2796" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2795" xlink:to="Locator_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_2796" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2797" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CurrentForeignTaxExpenseBenefit" xlink:label="Locator_us-gaap_CurrentForeignTaxExpenseBenefit_2798" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2797" xlink:to="Locator_us-gaap_CurrentForeignTaxExpenseBenefit_2798" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2799" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit" xlink:label="Locator_us-gaap_CurrentIncomeTaxExpenseBenefit_2800" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2799" xlink:to="Locator_us-gaap_CurrentIncomeTaxExpenseBenefit_2800" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2801" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredFederalIncomeTaxExpenseBenefit" xlink:label="Locator_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_2802" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2801" xlink:to="Locator_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_2802" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2803" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit" xlink:label="Locator_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_2804" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2803" xlink:to="Locator_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_2804" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2805" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredForeignIncomeTaxExpenseBenefit" xlink:label="Locator_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_2806" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2805" xlink:to="Locator_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_2806" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2807" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_WithholdingTaxExpense" xlink:label="Locator_cmcsa_WithholdingTaxExpense_2808" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2807" xlink:to="Locator_cmcsa_WithholdingTaxExpense_2808" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2809" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_StateAndLocalTaxExpenseBenefit" xlink:label="Locator_cmcsa_StateAndLocalTaxExpenseBenefit_2810" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2809" xlink:to="Locator_cmcsa_StateAndLocalTaxExpenseBenefit_2810" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2777" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2778" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2777" xlink:to="Locator_us-gaap_StatementTable_2778" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureIncomeTaxesFederalStatutoryDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2835" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsAxis" xlink:label="Locator_cmcsa_TaxAdjustmentsAxis_2836" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2835" xlink:to="Locator_cmcsa_TaxAdjustmentsAxis_2836" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsAxis" xlink:label="Locator_cmcsa_TaxAdjustmentsAxis_2837" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_2838" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_TaxAdjustmentsAxis_2837" xlink:to="Locator_cmcsa_TaxAdjustmentsDomain_2838" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_2839" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_UncertainAndEffectivelySettledTaxPositionsNetMember" xlink:label="Locator_cmcsa_UncertainAndEffectivelySettledTaxPositionsNetMember_2840" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_2839" xlink:to="Locator_cmcsa_UncertainAndEffectivelySettledTaxPositionsNetMember_2840" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_2841" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_AccruedInterestOnUncertainAndEffectivelySettledTaxPositionsNetMember" xlink:label="Locator_cmcsa_AccruedInterestOnUncertainAndEffectivelySettledTaxPositionsNetMember_2842" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_2841" xlink:to="Locator_cmcsa_AccruedInterestOnUncertainAndEffectivelySettledTaxPositionsNetMember_2842" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2843" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate" xlink:label="Locator_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_2844" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2843" xlink:to="Locator_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_2844" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2845" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes" xlink:label="Locator_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_2846" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2845" xlink:to="Locator_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_2846" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2847" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential" xlink:label="Locator_us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential_2848" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2847" xlink:to="Locator_us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential_2848" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2849" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxReconciliationMinorityInterestIncomeExpense" xlink:label="Locator_us-gaap_IncomeTaxReconciliationMinorityInterestIncomeExpense_2850" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2849" xlink:to="Locator_us-gaap_IncomeTaxReconciliationMinorityInterestIncomeExpense_2850" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2851" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_IncomeTaxReconciliationBenefitRelatedToCertainSubsidiaryReorganizations" xlink:label="Locator_cmcsa_IncomeTaxReconciliationBenefitRelatedToCertainSubsidiaryReorganizations_2852" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2851" xlink:to="Locator_cmcsa_IncomeTaxReconciliationBenefitRelatedToCertainSubsidiaryReorganizations_2852" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2853" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxReconciliationOtherAdjustments" xlink:label="Locator_us-gaap_IncomeTaxReconciliationOtherAdjustments_2854" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2853" xlink:to="Locator_us-gaap_IncomeTaxReconciliationOtherAdjustments_2854" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2831" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2832" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2831" xlink:to="Locator_us-gaap_StatementTable_2832" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureIncomeTaxesComponentsOfNetDeferredTaxLiabilityDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2889" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsAxis" xlink:label="Locator_cmcsa_TaxAdjustmentsAxis_2890" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2889" xlink:to="Locator_cmcsa_TaxAdjustmentsAxis_2890" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsAxis" xlink:label="Locator_cmcsa_TaxAdjustmentsAxis_2893" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_2894" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_TaxAdjustmentsAxis_2893" xlink:to="Locator_cmcsa_TaxAdjustmentsDomain_2894" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_2895" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_PropertyAndEquipmentAndIntangibleAssetsMember" xlink:label="Locator_cmcsa_PropertyAndEquipmentAndIntangibleAssetsMember_2896" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_2895" xlink:to="Locator_cmcsa_PropertyAndEquipmentAndIntangibleAssetsMember_2896" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_2897" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentsMember" xlink:label="Locator_us-gaap_InvestmentsMember_2898" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_2897" xlink:to="Locator_us-gaap_InvestmentsMember_2898" order="2.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_2899" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_IndexedDebtSecuritiesMember" xlink:label="Locator_cmcsa_IndexedDebtSecuritiesMember_2900" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_2899" xlink:to="Locator_cmcsa_IndexedDebtSecuritiesMember_2900" order="3.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_2901" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ForeignSubsidiariesAndUndistributedForeignEarningsMember" xlink:label="Locator_cmcsa_ForeignSubsidiariesAndUndistributedForeignEarningsMember_2902" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_2901" xlink:to="Locator_cmcsa_ForeignSubsidiariesAndUndistributedForeignEarningsMember_2902" order="4.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_2903" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DifferencesBetweenBookAndTaxOutsideBasisOfNbcuniversalMember" xlink:label="Locator_cmcsa_DifferencesBetweenBookAndTaxOutsideBasisOfNbcuniversalMember_2904" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_2903" xlink:to="Locator_cmcsa_DifferencesBetweenBookAndTaxOutsideBasisOfNbcuniversalMember_2904" order="5.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_2905" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DifferencesBetweenBookAndTaxBasisOfLongTermDebtMember" xlink:label="Locator_cmcsa_DifferencesBetweenBookAndTaxBasisOfLongTermDebtMember_2906" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_2905" xlink:to="Locator_cmcsa_DifferencesBetweenBookAndTaxBasisOfLongTermDebtMember_2906" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2891" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2892" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2891" xlink:to="Locator_dei_LegalEntityAxis_2892" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2907" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2908" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_2907" xlink:to="Locator_dei_EntityDomain_2908" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2909" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NbcuniversalMember" xlink:label="Locator_cmcsa_NbcuniversalMember_2910" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2909" xlink:to="Locator_cmcsa_NbcuniversalMember_2910" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2911" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwards" xlink:label="Locator_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_2912" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2911" xlink:to="Locator_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_2912" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2913" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsOther" xlink:label="Locator_us-gaap_DeferredTaxAssetsOther_2914" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2913" xlink:to="Locator_us-gaap_DeferredTaxAssetsOther_2914" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2915" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther" xlink:label="Locator_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther_2916" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2915" xlink:to="Locator_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther_2916" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2917" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance" xlink:label="Locator_us-gaap_DeferredTaxAssetsValuationAllowance_2918" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2917" xlink:to="Locator_us-gaap_DeferredTaxAssetsValuationAllowance_2918" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2919" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsNet" xlink:label="Locator_us-gaap_DeferredTaxAssetsNet_2920" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2919" xlink:to="Locator_us-gaap_DeferredTaxAssetsNet_2920" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2921" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxLiabilitiesOther" xlink:label="Locator_us-gaap_DeferredTaxLiabilitiesOther_2922" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2921" xlink:to="Locator_us-gaap_DeferredTaxLiabilitiesOther_2922" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2923" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilities" xlink:label="Locator_us-gaap_DeferredIncomeTaxLiabilities_2924" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2923" xlink:to="Locator_us-gaap_DeferredIncomeTaxLiabilities_2924" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2925" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxLiabilities" xlink:label="Locator_us-gaap_DeferredTaxLiabilities_2926" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2925" xlink:to="Locator_us-gaap_DeferredTaxLiabilities_2926" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2881" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2882" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2881" xlink:to="Locator_us-gaap_StatementTable_2882" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureSupplementalFinancialInformationNoncashInvestingAndFinancingActivitiesDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2999" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_3000" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2999" xlink:to="Locator_cmcsa_LegalEntity1Axis_3000" order="2.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_3001" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_3002" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_LegalEntity1Axis_3001" xlink:to="Locator_cmcsa_Entity1Domain_3002" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_3003" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_3004" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_Entity1Domain_3003" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_3004" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2997" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2998" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2997" xlink:to="Locator_dei_LegalEntityAxis_2998" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3005" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3006" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_3005" xlink:to="Locator_dei_EntityDomain_3006" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3007" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="Locator_us-gaap_RevolvingCreditFacilityMember_3008" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3007" xlink:to="Locator_us-gaap_RevolvingCreditFacilityMember_3008" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3009" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="Locator_us-gaap_SeniorNotesMember_3010" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3009" xlink:to="Locator_us-gaap_SeniorNotesMember_3010" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3011" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PreferredStockMember" xlink:label="Locator_us-gaap_PreferredStockMember_3012" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3011" xlink:to="Locator_us-gaap_PreferredStockMember_3012" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3013" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NbcuniversalRedemptionTransactionMember" xlink:label="Locator_cmcsa_NbcuniversalRedemptionTransactionMember_3014" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3013" xlink:to="Locator_cmcsa_NbcuniversalRedemptionTransactionMember_3014" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3015" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NoncontrollingInterestAcquired" xlink:label="Locator_cmcsa_NoncontrollingInterestAcquired_3016" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3015" xlink:to="Locator_cmcsa_NoncontrollingInterestAcquired_3016" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3017" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ConsiderationTransferredToAcquireAdditionalInterestInSubsidiaries" xlink:label="Locator_cmcsa_ConsiderationTransferredToAcquireAdditionalInterestInSubsidiaries_3018" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3017" xlink:to="Locator_cmcsa_ConsiderationTransferredToAcquireAdditionalInterestInSubsidiaries_3018" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3019" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ConsiderationTransferredRelatedToRedemptionTransactionByFundingSource" xlink:label="Locator_cmcsa_ConsiderationTransferredRelatedToRedemptionTransactionByFundingSource_3020" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3019" xlink:to="Locator_cmcsa_ConsiderationTransferredRelatedToRedemptionTransactionByFundingSource_3020" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3021" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TotalNonCashConsiderationTransferredInRedemptionTransaction" xlink:label="Locator_cmcsa_TotalNonCashConsiderationTransferredInRedemptionTransaction_3022" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3021" xlink:to="Locator_cmcsa_TotalNonCashConsiderationTransferredInRedemptionTransaction_3022" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3025" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DividendsPayableCurrentAndNoncurrent" xlink:label="Locator_us-gaap_DividendsPayableCurrentAndNoncurrent_3026" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3025" xlink:to="Locator_us-gaap_DividendsPayableCurrentAndNoncurrent_3026" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3027" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DividendsPayableAmountPerShare" xlink:label="Locator_us-gaap_DividendsPayableAmountPerShare_3028" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3027" xlink:to="Locator_us-gaap_DividendsPayableAmountPerShare_3028" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3029" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CapitalExpendituresIncurredButNotYetPaid" xlink:label="Locator_us-gaap_CapitalExpendituresIncurredButNotYetPaid_3030" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3029" xlink:to="Locator_us-gaap_CapitalExpendituresIncurredButNotYetPaid_3030" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3031" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1" xlink:label="Locator_us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1_3032" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3031" xlink:to="Locator_us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1_3032" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3033" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FairValueEquitySecuritiesSettlement" xlink:label="Locator_cmcsa_FairValueEquitySecuritiesSettlement_3034" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3033" xlink:to="Locator_cmcsa_FairValueEquitySecuritiesSettlement_3034" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3035" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NoncashConsiderationTransferredInPurchaseOfBuilding" xlink:label="Locator_cmcsa_NoncashConsiderationTransferredInPurchaseOfBuilding_3036" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3035" xlink:to="Locator_cmcsa_NoncashConsiderationTransferredInPurchaseOfBuilding_3036" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3037" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CapitalContributionAccruedButNotYetPaid" xlink:label="Locator_cmcsa_CapitalContributionAccruedButNotYetPaid_3038" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3037" xlink:to="Locator_cmcsa_CapitalContributionAccruedButNotYetPaid_3038" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3039" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Contributionfrommember" xlink:label="Locator_cmcsa_Contributionfrommember_3040" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3039" xlink:to="Locator_cmcsa_Contributionfrommember_3040" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3023" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PreferredStockLiquidationPreferenceValue" xlink:label="Locator_us-gaap_PreferredStockLiquidationPreferenceValue_3024" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3023" xlink:to="Locator_us-gaap_PreferredStockLiquidationPreferenceValue_3024" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2993" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2994" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2993" xlink:to="Locator_us-gaap_StatementTable_2994" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureCommitmentsAndContingenciesNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3087" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_3088" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3087" xlink:to="Locator_cmcsa_LegalEntity1Axis_3088" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_3089" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_3090" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_LegalEntity1Axis_3089" xlink:to="Locator_cmcsa_Entity1Domain_3090" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_3091" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_3092" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_Entity1Domain_3091" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_3092" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3093" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NumberOfCollectiveBargainingAgreementsExpiredOrScheduleToExpireByEndOfYear" xlink:label="Locator_cmcsa_NumberOfCollectiveBargainingAgreementsExpiredOrScheduleToExpireByEndOfYear_3094" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3093" xlink:to="Locator_cmcsa_NumberOfCollectiveBargainingAgreementsExpiredOrScheduleToExpireByEndOfYear_3094" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3095" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NumberOfEmployeesCoveredUnderCollectiveBargainingAgreements" xlink:label="Locator_cmcsa_NumberOfEmployeesCoveredUnderCollectiveBargainingAgreements_3096" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3095" xlink:to="Locator_cmcsa_NumberOfEmployeesCoveredUnderCollectiveBargainingAgreements_3096" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3097" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NumberOfEmployeesCoveredUnderCollectiveBargainingAgreementsExpiredOrScheduleToExpireByEndOfYear" xlink:label="Locator_cmcsa_NumberOfEmployeesCoveredUnderCollectiveBargainingAgreementsExpiredOrScheduleToExpireByEndOfYear_3098" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3097" xlink:to="Locator_cmcsa_NumberOfEmployeesCoveredUnderCollectiveBargainingAgreementsExpiredOrScheduleToExpireByEndOfYear_3098" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3099" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_PercentageOfEmployeesCoveredUnderCollectiveBargainingAgreementsExpiredOrScheduledToExpireDuringNextYear" xlink:label="Locator_cmcsa_PercentageOfEmployeesCoveredUnderCollectiveBargainingAgreementsExpiredOrScheduledToExpireDuringNextYear_3100" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3099" xlink:to="Locator_cmcsa_PercentageOfEmployeesCoveredUnderCollectiveBargainingAgreementsExpiredOrScheduledToExpireDuringNextYear_3100" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3101" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SubsequentFairValueAdjustments" xlink:label="Locator_cmcsa_SubsequentFairValueAdjustments_3102" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3101" xlink:to="Locator_cmcsa_SubsequentFairValueAdjustments_3102" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3103" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_EquityInterestPercentage" xlink:label="Locator_cmcsa_EquityInterestPercentage_3104" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3103" xlink:to="Locator_cmcsa_EquityInterestPercentage_3104" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3105" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_VotingInterestPercentage" xlink:label="Locator_cmcsa_VotingInterestPercentage_3106" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3105" xlink:to="Locator_cmcsa_VotingInterestPercentage_3106" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3107" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DebtOfUnconsolidatedVie" xlink:label="Locator_cmcsa_DebtOfUnconsolidatedVie_3108" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3107" xlink:to="Locator_cmcsa_DebtOfUnconsolidatedVie_3108" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3109" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DebtInstrumentMaturityPeriod" xlink:label="Locator_cmcsa_DebtInstrumentMaturityPeriod_3110" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3109" xlink:to="Locator_cmcsa_DebtInstrumentMaturityPeriod_3110" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3113" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CashPaidForSettlementOfCollateralLiability" xlink:label="Locator_cmcsa_CashPaidForSettlementOfCollateralLiability_3114" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3113" xlink:to="Locator_cmcsa_CashPaidForSettlementOfCollateralLiability_3114" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3111" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CollateralLiabilityForUnconsolidatedSubsidiaryDebt" xlink:label="Locator_cmcsa_CollateralLiabilityForUnconsolidatedSubsidiaryDebt_3112" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3111" xlink:to="Locator_cmcsa_CollateralLiabilityForUnconsolidatedSubsidiaryDebt_3112" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3083" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3084" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3083" xlink:to="Locator_us-gaap_StatementTable_3084" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/CommitmentsAndContingenciesMinimumAnnualCommitmentsUnderTheProgrammingLicenseAgreementsAndOperatingLeasesDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3153" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_3154" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3153" xlink:to="Locator_cmcsa_LegalEntity1Axis_3154" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_3157" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_3158" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_LegalEntity1Axis_3157" xlink:to="Locator_cmcsa_Entity1Domain_3158" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_3159" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_3160" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_Entity1Domain_3159" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_3160" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3155" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3156" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3155" xlink:to="Locator_dei_LegalEntityAxis_3156" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3161" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3162" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_3161" xlink:to="Locator_dei_EntityDomain_3162" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3163" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ProgrammingandTalentCommitmentsMember" xlink:label="Locator_cmcsa_ProgrammingandTalentCommitmentsMember_3164" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3163" xlink:to="Locator_cmcsa_ProgrammingandTalentCommitmentsMember_3164" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3165" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ContractualObligationDueInNextTwelveMonths" xlink:label="Locator_us-gaap_ContractualObligationDueInNextTwelveMonths_3166" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3165" xlink:to="Locator_us-gaap_ContractualObligationDueInNextTwelveMonths_3166" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3167" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ContractualObligationDueInSecondYear" xlink:label="Locator_us-gaap_ContractualObligationDueInSecondYear_3168" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3167" xlink:to="Locator_us-gaap_ContractualObligationDueInSecondYear_3168" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3169" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ContractualObligationDueInThirdYear" xlink:label="Locator_us-gaap_ContractualObligationDueInThirdYear_3170" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3169" xlink:to="Locator_us-gaap_ContractualObligationDueInThirdYear_3170" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3171" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ContractualObligationDueInFourthYear" xlink:label="Locator_us-gaap_ContractualObligationDueInFourthYear_3172" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3171" xlink:to="Locator_us-gaap_ContractualObligationDueInFourthYear_3172" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3173" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ContractualObligationDueInFifthYear" xlink:label="Locator_us-gaap_ContractualObligationDueInFifthYear_3174" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3173" xlink:to="Locator_us-gaap_ContractualObligationDueInFifthYear_3174" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3175" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ContractualObligationDueAfterFifthYear" xlink:label="Locator_us-gaap_ContractualObligationDueAfterFifthYear_3176" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3175" xlink:to="Locator_us-gaap_ContractualObligationDueAfterFifthYear_3176" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3177" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent" xlink:label="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_3178" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3177" xlink:to="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_3178" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3179" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_3180" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3179" xlink:to="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_3180" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3181" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_3182" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3181" xlink:to="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_3182" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3183" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_3184" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3183" xlink:to="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_3184" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3185" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears" xlink:label="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_3186" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3185" xlink:to="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_3186" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3187" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter" xlink:label="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_3188" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3187" xlink:to="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_3188" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3189" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:label="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_3190" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3189" xlink:to="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_3190" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3149" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3150" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3149" xlink:to="Locator_us-gaap_StatementTable_3150" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureCommitmentsAndContingenciesRentalExpenseDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3207" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3208" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3207" xlink:to="Locator_dei_LegalEntityAxis_3208" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3209" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3210" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_3209" xlink:to="Locator_dei_EntityDomain_3210" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3211" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_3212" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3211" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_3212" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3213" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LeaseAndRentalExpense" xlink:label="Locator_us-gaap_LeaseAndRentalExpense_3214" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3213" xlink:to="Locator_us-gaap_LeaseAndRentalExpense_3214" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3215" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3216" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3215" xlink:to="Locator_us-gaap_StatementTable_3216" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureFinancialDataByBusinessSegmentDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3249" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="Locator_us-gaap_StatementGeographicalAxis_3250" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3249" xlink:to="Locator_us-gaap_StatementGeographicalAxis_3250" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="Locator_us-gaap_StatementGeographicalAxis_3255" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="Locator_us-gaap_SegmentGeographicalDomain_3256" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_StatementGeographicalAxis_3255" xlink:to="Locator_us-gaap_SegmentGeographicalDomain_3256" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="Locator_us-gaap_StatementGeographicalAxis_3325" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="Locator_us-gaap_SegmentGeographicalDomain_3326" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_StatementGeographicalAxis_3325" xlink:to="Locator_us-gaap_SegmentGeographicalDomain_3326" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="Locator_us-gaap_SegmentGeographicalDomain_3257" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NonUSCustomersMember" xlink:label="Locator_cmcsa_NonUSCustomersMember_3258" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentGeographicalDomain_3257" xlink:to="Locator_cmcsa_NonUSCustomersMember_3258" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="Locator_us-gaap_SegmentGeographicalDomain_3259" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_UnitedStatesMember" xlink:label="Locator_cmcsa_UnitedStatesMember_3260" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentGeographicalDomain_3259" xlink:to="Locator_cmcsa_UnitedStatesMember_3260" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3253" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="Locator_us-gaap_ConsolidationItemsAxis_3254" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3253" xlink:to="Locator_us-gaap_ConsolidationItemsAxis_3254" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="Locator_us-gaap_ConsolidationItemsAxis_3261" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="Locator_us-gaap_ConsolidationItemsDomain_3262" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_ConsolidationItemsAxis_3261" xlink:to="Locator_us-gaap_ConsolidationItemsDomain_3262" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="Locator_us-gaap_ConsolidationItemsAxis_3327" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="Locator_us-gaap_ConsolidationItemsDomain_3328" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_ConsolidationItemsAxis_3327" xlink:to="Locator_us-gaap_ConsolidationItemsDomain_3328" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="Locator_us-gaap_ConsolidationItemsDomain_3263" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingSegmentsMember" xlink:label="Locator_us-gaap_OperatingSegmentsMember_3264" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ConsolidationItemsDomain_3263" xlink:to="Locator_us-gaap_OperatingSegmentsMember_3264" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="Locator_us-gaap_ConsolidationItemsDomain_3265" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CorporateMember" xlink:label="Locator_us-gaap_CorporateMember_3266" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ConsolidationItemsDomain_3265" xlink:to="Locator_us-gaap_CorporateMember_3266" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="Locator_us-gaap_ConsolidationItemsDomain_3267" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IntersegmentEliminationMember" xlink:label="Locator_us-gaap_IntersegmentEliminationMember_3268" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ConsolidationItemsDomain_3267" xlink:to="Locator_us-gaap_IntersegmentEliminationMember_3268" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3247" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="Locator_us-gaap_StatementBusinessSegmentsAxis_3248" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3247" xlink:to="Locator_us-gaap_StatementBusinessSegmentsAxis_3248" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="Locator_us-gaap_StatementBusinessSegmentsAxis_3269" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3270" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_StatementBusinessSegmentsAxis_3269" xlink:to="Locator_us-gaap_SegmentDomain_3270" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="Locator_us-gaap_StatementBusinessSegmentsAxis_3329" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3330" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_StatementBusinessSegmentsAxis_3329" xlink:to="Locator_us-gaap_SegmentDomain_3330" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3271" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CableCommunicationsMember" xlink:label="Locator_cmcsa_CableCommunicationsMember_3272" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3271" xlink:to="Locator_cmcsa_CableCommunicationsMember_3272" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3273" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CableNetworksMember" xlink:label="Locator_cmcsa_CableNetworksMember_3274" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3273" xlink:to="Locator_cmcsa_CableNetworksMember_3274" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3275" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_BroadcastTelevisionMember" xlink:label="Locator_cmcsa_BroadcastTelevisionMember_3276" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3275" xlink:to="Locator_cmcsa_BroadcastTelevisionMember_3276" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3277" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FilmedEntertainmentMember" xlink:label="Locator_cmcsa_FilmedEntertainmentMember_3278" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3277" xlink:to="Locator_cmcsa_FilmedEntertainmentMember_3278" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3279" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ThemeParksMember" xlink:label="Locator_cmcsa_ThemeParksMember_3280" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3279" xlink:to="Locator_cmcsa_ThemeParksMember_3280" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3281" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_HeadquartersAndOtherMember" xlink:label="Locator_cmcsa_HeadquartersAndOtherMember_3282" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3281" xlink:to="Locator_cmcsa_HeadquartersAndOtherMember_3282" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3283" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NbcuniversalEliminationsMember" xlink:label="Locator_cmcsa_NbcuniversalEliminationsMember_3284" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3283" xlink:to="Locator_cmcsa_NbcuniversalEliminationsMember_3284" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3285" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NbcuniversalMember" xlink:label="Locator_cmcsa_NbcuniversalMember_3286" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3285" xlink:to="Locator_cmcsa_NbcuniversalMember_3286" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3287" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CorporateAndOtherMember" xlink:label="Locator_us-gaap_CorporateAndOtherMember_3288" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3287" xlink:to="Locator_us-gaap_CorporateAndOtherMember_3288" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3289" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_EliminationsMember" xlink:label="Locator_cmcsa_EliminationsMember_3290" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3289" xlink:to="Locator_cmcsa_EliminationsMember_3290" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3291" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CableCommunicationsSegmentRevenuePercentageVideoMember" xlink:label="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageVideoMember_3292" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3291" xlink:to="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageVideoMember_3292" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3293" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CableCommunicationsSegmentRevenuePercentageHighSpeedInternetMember" xlink:label="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageHighSpeedInternetMember_3294" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3293" xlink:to="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageHighSpeedInternetMember_3294" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3295" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CableCommunicationsSegmentRevenuePercentageVoiceMember" xlink:label="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageVoiceMember_3296" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3295" xlink:to="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageVoiceMember_3296" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3297" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CableCommunicationsSegmentRevenuePercentageBusinessServicesMember" xlink:label="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageBusinessServicesMember_3298" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3297" xlink:to="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageBusinessServicesMember_3298" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3299" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CableCommunicationsSegmentRevenuePercentageAdvertisingMember" xlink:label="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageAdvertisingMember_3300" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3299" xlink:to="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageAdvertisingMember_3300" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3301" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CableCommunicationsSegmentRevenuePercentageOtherMember" xlink:label="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageOtherMember_3302" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3301" xlink:to="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageOtherMember_3302" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3303" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CableCommunicationsSegmentRevenuePercentageFranchiseFeesMember" xlink:label="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageFranchiseFeesMember_3304" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3303" xlink:to="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageFranchiseFeesMember_3304" order="17.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3251" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3252" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3251" xlink:to="Locator_dei_LegalEntityAxis_3252" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3305" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3306" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_3305" xlink:to="Locator_dei_EntityDomain_3306" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3307" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_3308" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3307" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_3308" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3311" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_OperatingIncomeExcludingDepreciationAndAmortization" xlink:label="Locator_cmcsa_OperatingIncomeExcludingDepreciationAndAmortization_3312" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3311" xlink:to="Locator_cmcsa_OperatingIncomeExcludingDepreciationAndAmortization_3312" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3313" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="Locator_us-gaap_DepreciationAndAmortization_3314" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3313" xlink:to="Locator_us-gaap_DepreciationAndAmortization_3314" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3317" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="Locator_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_3318" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3317" xlink:to="Locator_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_3318" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3319" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CableSegmentRevenueTypesAsPercentageOfTotalCableRevenue" xlink:label="Locator_cmcsa_CableSegmentRevenueTypesAsPercentageOfTotalCableRevenue_3320" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3319" xlink:to="Locator_cmcsa_CableSegmentRevenueTypesAsPercentageOfTotalCableRevenue_3320" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3321" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_BusinessAcquisitionPurchasePriceAllocationUnfavorableContractAccrual1" xlink:label="Locator_cmcsa_BusinessAcquisitionPurchasePriceAllocationUnfavorableContractAccrual1_3322" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3321" xlink:to="Locator_cmcsa_BusinessAcquisitionPurchasePriceAllocationUnfavorableContractAccrual1_3322" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3323" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Reclassificationofexpensesduetochangeincontractualobligation" xlink:label="Locator_cmcsa_Reclassificationofexpensesduetochangeincontractualobligation_3324" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3323" xlink:to="Locator_cmcsa_Reclassificationofexpensesduetochangeincontractualobligation_3324" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3309" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Revenues" xlink:label="Locator_us-gaap_Revenues_3310" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3309" xlink:to="Locator_us-gaap_Revenues_3310" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3315" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="Locator_us-gaap_OperatingIncomeLoss_3316" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3315" xlink:to="Locator_us-gaap_OperatingIncomeLoss_3316" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3243" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3244" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3243" xlink:to="Locator_us-gaap_StatementTable_3244" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureCondensedConsolidatingFinancialInformationCondensedConsolidatingBalanceSheetDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3465" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="Locator_us-gaap_ConsolidationItemsAxis_3466" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3465" xlink:to="Locator_us-gaap_ConsolidationItemsAxis_3466" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="Locator_us-gaap_ConsolidationItemsAxis_3469" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="Locator_us-gaap_ConsolidationItemsDomain_3470" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_ConsolidationItemsAxis_3469" xlink:to="Locator_us-gaap_ConsolidationItemsDomain_3470" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="Locator_us-gaap_ConsolidationItemsDomain_3471" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_EliminationAndConsolidationAdjustmentsMember" xlink:label="Locator_cmcsa_EliminationAndConsolidationAdjustmentsMember_3472" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ConsolidationItemsDomain_3471" xlink:to="Locator_cmcsa_EliminationAndConsolidationAdjustmentsMember_3472" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3467" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3468" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3467" xlink:to="Locator_dei_LegalEntityAxis_3468" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3473" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3474" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_3473" xlink:to="Locator_dei_EntityDomain_3474" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3477" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ComcastHoldingsMember" xlink:label="Locator_cmcsa_ComcastHoldingsMember_3478" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3477" xlink:to="Locator_cmcsa_ComcastHoldingsMember_3478" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3479" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CcclParentMember" xlink:label="Locator_cmcsa_CcclParentMember_3480" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3479" xlink:to="Locator_cmcsa_CcclParentMember_3480" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3481" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CombinedCchmoParentsMember" xlink:label="Locator_cmcsa_CombinedCchmoParentsMember_3482" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3481" xlink:to="Locator_cmcsa_CombinedCchmoParentsMember_3482" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3483" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NbcuniversalMediaParentMember" xlink:label="Locator_cmcsa_NbcuniversalMediaParentMember_3484" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3483" xlink:to="Locator_cmcsa_NbcuniversalMediaParentMember_3484" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3485" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ComcastNonGuarantorSubsidiariesMember" xlink:label="Locator_cmcsa_ComcastNonGuarantorSubsidiariesMember_3486" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3485" xlink:to="Locator_cmcsa_ComcastNonGuarantorSubsidiariesMember_3486" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3475" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ParentCompanyMember" xlink:label="Locator_us-gaap_ParentCompanyMember_3476" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3475" xlink:to="Locator_us-gaap_ParentCompanyMember_3476" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3493" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ProgrammingRightsCurrent" xlink:label="Locator_cmcsa_ProgrammingRightsCurrent_3494" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3493" xlink:to="Locator_cmcsa_ProgrammingRightsCurrent_3494" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3495" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="Locator_us-gaap_OtherAssetsCurrent_3496" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3495" xlink:to="Locator_us-gaap_OtherAssetsCurrent_3496" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3497" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="Locator_us-gaap_AssetsCurrent_3498" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3497" xlink:to="Locator_us-gaap_AssetsCurrent_3498" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3499" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FilmAndTelevisionCosts" xlink:label="Locator_cmcsa_FilmAndTelevisionCosts_3500" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3499" xlink:to="Locator_cmcsa_FilmAndTelevisionCosts_3500" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3501" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermInvestments" xlink:label="Locator_us-gaap_LongTermInvestments_3502" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3501" xlink:to="Locator_us-gaap_LongTermInvestments_3502" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3503" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_InvestmentsInAndAmountsDueFromSubsidiariesEliminatedUponConsolidation" xlink:label="Locator_cmcsa_InvestmentsInAndAmountsDueFromSubsidiariesEliminatedUponConsolidation_3504" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3503" xlink:to="Locator_cmcsa_InvestmentsInAndAmountsDueFromSubsidiariesEliminatedUponConsolidation_3504" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3505" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentNet_3506" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3505" xlink:to="Locator_us-gaap_PropertyPlantAndEquipmentNet_3506" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3507" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IndefiniteLivedFranchiseRights" xlink:label="Locator_us-gaap_IndefiniteLivedFranchiseRights_3508" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3507" xlink:to="Locator_us-gaap_IndefiniteLivedFranchiseRights_3508" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3511" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherIntangibleAssetsNet" xlink:label="Locator_us-gaap_OtherIntangibleAssetsNet_3512" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3511" xlink:to="Locator_us-gaap_OtherIntangibleAssetsNet_3512" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3513" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="Locator_us-gaap_OtherAssetsNoncurrent_3514" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3513" xlink:to="Locator_us-gaap_OtherAssetsNoncurrent_3514" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3515" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Assets" xlink:label="Locator_us-gaap_Assets_3516" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3515" xlink:to="Locator_us-gaap_Assets_3516" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3517" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_3518" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3517" xlink:to="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_3518" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3521" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_AccruedParticipationsAndResidualsCurrent" xlink:label="Locator_cmcsa_AccruedParticipationsAndResidualsCurrent_3522" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3521" xlink:to="Locator_cmcsa_AccruedParticipationsAndResidualsCurrent_3522" order="18.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3523" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_AccruedExpensesAndOtherCurrentLiabilitiesIncludingDeferredRevenue" xlink:label="Locator_cmcsa_AccruedExpensesAndOtherCurrentLiabilitiesIncludingDeferredRevenue_3524" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3523" xlink:to="Locator_cmcsa_AccruedExpensesAndOtherCurrentLiabilitiesIncludingDeferredRevenue_3524" order="19.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3525" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtCurrent" xlink:label="Locator_us-gaap_DebtCurrent_3526" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3525" xlink:to="Locator_us-gaap_DebtCurrent_3526" order="20.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3527" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="Locator_us-gaap_LiabilitiesCurrent_3528" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3527" xlink:to="Locator_us-gaap_LiabilitiesCurrent_3528" order="21.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3529" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations" xlink:label="Locator_us-gaap_LongTermDebtAndCapitalLeaseObligations_3530" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3529" xlink:to="Locator_us-gaap_LongTermDebtAndCapitalLeaseObligations_3530" order="22.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3531" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxLiabilitiesNoncurrent" xlink:label="Locator_us-gaap_DeferredTaxLiabilitiesNoncurrent_3532" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3531" xlink:to="Locator_us-gaap_DeferredTaxLiabilitiesNoncurrent_3532" order="23.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3535" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock" xlink:label="Locator_cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock_3536" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3535" xlink:to="Locator_cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock_3536" order="25.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3537" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount" xlink:label="Locator_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_3538" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3537" xlink:to="Locator_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_3538" order="26.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3539" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_3540" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3539" xlink:to="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_3540" order="27.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3541" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockValue" xlink:label="Locator_us-gaap_CommonStockValue_3542" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3541" xlink:to="Locator_us-gaap_CommonStockValue_3542" order="28.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3543" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_OtherStockholdersEquity" xlink:label="Locator_cmcsa_OtherStockholdersEquity_3544" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3543" xlink:to="Locator_cmcsa_OtherStockholdersEquity_3544" order="29.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3545" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="Locator_us-gaap_StockholdersEquity_3546" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3545" xlink:to="Locator_us-gaap_StockholdersEquity_3546" order="30.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3547" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MinorityInterest" xlink:label="Locator_us-gaap_MinorityInterest_3548" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3547" xlink:to="Locator_us-gaap_MinorityInterest_3548" order="31.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3549" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_3550" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3549" xlink:to="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_3550" order="32.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3551" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquity_3552" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3551" xlink:to="Locator_us-gaap_LiabilitiesAndStockholdersEquity_3552" order="33.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3489" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="Locator_us-gaap_CashAndCashEquivalentsAtCarryingValue_3490" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3489" xlink:to="Locator_us-gaap_CashAndCashEquivalentsAtCarryingValue_3490" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3491" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="Locator_us-gaap_AccountsReceivableNetCurrent_3492" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3491" xlink:to="Locator_us-gaap_AccountsReceivableNetCurrent_3492" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3519" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="Locator_us-gaap_AccountsPayableCurrent_3520" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3519" xlink:to="Locator_us-gaap_AccountsPayableCurrent_3520" order="17.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3533" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="Locator_us-gaap_OtherLiabilitiesNoncurrent_3534" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3533" xlink:to="Locator_us-gaap_OtherLiabilitiesNoncurrent_3534" order="24.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3509" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Goodwill" xlink:label="Locator_us-gaap_Goodwill_3510" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3509" xlink:to="Locator_us-gaap_Goodwill_3510" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3487" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="Locator_us-gaap_AssetsAbstract_3488" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3487" xlink:to="Locator_us-gaap_AssetsAbstract_3488" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3461" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3462" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3461" xlink:to="Locator_us-gaap_StatementTable_3462" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureCondensedConsolidatingFinancialInformationCondensedConsolidatingStatementOfIncomeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3629" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="Locator_us-gaap_ConsolidationItemsAxis_3630" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3629" xlink:to="Locator_us-gaap_ConsolidationItemsAxis_3630" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="Locator_us-gaap_ConsolidationItemsAxis_3631" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="Locator_us-gaap_ConsolidationItemsDomain_3632" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_ConsolidationItemsAxis_3631" xlink:to="Locator_us-gaap_ConsolidationItemsDomain_3632" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="Locator_us-gaap_ConsolidationItemsDomain_3633" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_EliminationAndConsolidationAdjustmentsMember" xlink:label="Locator_cmcsa_EliminationAndConsolidationAdjustmentsMember_3634" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ConsolidationItemsDomain_3633" xlink:to="Locator_cmcsa_EliminationAndConsolidationAdjustmentsMember_3634" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3627" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3628" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3627" xlink:to="Locator_dei_LegalEntityAxis_3628" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3635" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3636" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_3635" xlink:to="Locator_dei_EntityDomain_3636" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3639" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ComcastHoldingsMember" xlink:label="Locator_cmcsa_ComcastHoldingsMember_3640" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3639" xlink:to="Locator_cmcsa_ComcastHoldingsMember_3640" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3641" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CcclParentMember" xlink:label="Locator_cmcsa_CcclParentMember_3642" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3641" xlink:to="Locator_cmcsa_CcclParentMember_3642" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3643" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CombinedCchmoParentsMember" xlink:label="Locator_cmcsa_CombinedCchmoParentsMember_3644" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3643" xlink:to="Locator_cmcsa_CombinedCchmoParentsMember_3644" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3645" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NbcuniversalMediaParentMember" xlink:label="Locator_cmcsa_NbcuniversalMediaParentMember_3646" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3645" xlink:to="Locator_cmcsa_NbcuniversalMediaParentMember_3646" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3647" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ComcastNonGuarantorSubsidiariesMember" xlink:label="Locator_cmcsa_ComcastNonGuarantorSubsidiariesMember_3648" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3647" xlink:to="Locator_cmcsa_ComcastNonGuarantorSubsidiariesMember_3648" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3637" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ParentCompanyMember" xlink:label="Locator_us-gaap_ParentCompanyMember_3638" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3637" xlink:to="Locator_us-gaap_ParentCompanyMember_3638" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3649" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SalesRevenueServicesNet" xlink:label="Locator_us-gaap_SalesRevenueServicesNet_3650" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3649" xlink:to="Locator_us-gaap_SalesRevenueServicesNet_3650" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3651" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ManagementFeesRevenue" xlink:label="Locator_us-gaap_ManagementFeesRevenue_3652" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3651" xlink:to="Locator_us-gaap_ManagementFeesRevenue_3652" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3657" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ProgrammingAndProductionCosts" xlink:label="Locator_cmcsa_ProgrammingAndProductionCosts_3658" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3657" xlink:to="Locator_cmcsa_ProgrammingAndProductionCosts_3658" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3659" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_OtherOperatingAndAdministrative" xlink:label="Locator_cmcsa_OtherOperatingAndAdministrative_3660" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3659" xlink:to="Locator_cmcsa_OtherOperatingAndAdministrative_3660" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3661" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MarketingAndAdvertisingExpense" xlink:label="Locator_us-gaap_MarketingAndAdvertisingExpense_3662" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3661" xlink:to="Locator_us-gaap_MarketingAndAdvertisingExpense_3662" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3663" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Depreciation" xlink:label="Locator_us-gaap_Depreciation_3664" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3663" xlink:to="Locator_us-gaap_Depreciation_3664" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3665" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="Locator_us-gaap_AmortizationOfIntangibleAssets_3666" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3665" xlink:to="Locator_us-gaap_AmortizationOfIntangibleAssets_3666" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3667" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="Locator_us-gaap_CostsAndExpenses_3668" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3667" xlink:to="Locator_us-gaap_CostsAndExpenses_3668" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3673" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InterestExpense" xlink:label="Locator_us-gaap_InterestExpense_3674" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3673" xlink:to="Locator_us-gaap_InterestExpense_3674" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3677" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="Locator_us-gaap_IncomeLossFromEquityMethodInvestments_3678" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3677" xlink:to="Locator_us-gaap_IncomeLossFromEquityMethodInvestments_3678" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3679" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="Locator_us-gaap_OtherNonoperatingIncomeExpense_3680" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3679" xlink:to="Locator_us-gaap_OtherNonoperatingIncomeExpense_3680" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3681" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="Locator_us-gaap_NonoperatingIncomeExpense_3682" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3681" xlink:to="Locator_us-gaap_NonoperatingIncomeExpense_3682" order="17.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3689" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock" xlink:label="Locator_cmcsa_NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock_3690" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3689" xlink:to="Locator_cmcsa_NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock_3690" order="21.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3693" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="Locator_us-gaap_ComprehensiveIncomeNetOfTax_3694" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3693" xlink:to="Locator_us-gaap_ComprehensiveIncomeNetOfTax_3694" order="23.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3675" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentIncomeNonoperating" xlink:label="Locator_us-gaap_InvestmentIncomeNonoperating_3676" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3675" xlink:to="Locator_us-gaap_InvestmentIncomeNonoperating_3676" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3653" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Revenues" xlink:label="Locator_us-gaap_Revenues_3654" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3653" xlink:to="Locator_us-gaap_Revenues_3654" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3655" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_3656" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3655" xlink:to="Locator_us-gaap_CostsAndExpensesAbstract_3656" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3669" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="Locator_us-gaap_OperatingIncomeLoss_3670" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3669" xlink:to="Locator_us-gaap_OperatingIncomeLoss_3670" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3671" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_3672" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3671" xlink:to="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_3672" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3683" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="Locator_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_3684" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3683" xlink:to="Locator_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_3684" order="18.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3685" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="Locator_us-gaap_IncomeTaxExpenseBenefit_3686" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3685" xlink:to="Locator_us-gaap_IncomeTaxExpenseBenefit_3686" order="19.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3687" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProfitLoss" xlink:label="Locator_us-gaap_ProfitLoss_3688" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3687" xlink:to="Locator_us-gaap_ProfitLoss_3688" order="20.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3691" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="Locator_us-gaap_NetIncomeLoss_3692" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3691" xlink:to="Locator_us-gaap_NetIncomeLoss_3692" order="22.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3623" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3624" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3623" xlink:to="Locator_us-gaap_StatementTable_3624" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureCondensedConsolidatingFinancialInformationCondensedConsolidatingStatementOfCashFlowsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3783" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="Locator_us-gaap_ConsolidationItemsAxis_3784" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3783" xlink:to="Locator_us-gaap_ConsolidationItemsAxis_3784" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="Locator_us-gaap_ConsolidationItemsAxis_3785" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="Locator_us-gaap_ConsolidationItemsDomain_3786" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_ConsolidationItemsAxis_3785" xlink:to="Locator_us-gaap_ConsolidationItemsDomain_3786" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="Locator_us-gaap_ConsolidationItemsDomain_3787" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_EliminationAndConsolidationAdjustmentsMember" xlink:label="Locator_cmcsa_EliminationAndConsolidationAdjustmentsMember_3788" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ConsolidationItemsDomain_3787" xlink:to="Locator_cmcsa_EliminationAndConsolidationAdjustmentsMember_3788" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3781" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3782" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3781" xlink:to="Locator_dei_LegalEntityAxis_3782" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3789" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3790" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_3789" xlink:to="Locator_dei_EntityDomain_3790" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3793" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ComcastHoldingsMember" xlink:label="Locator_cmcsa_ComcastHoldingsMember_3794" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3793" xlink:to="Locator_cmcsa_ComcastHoldingsMember_3794" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3795" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CcclParentMember" xlink:label="Locator_cmcsa_CcclParentMember_3796" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3795" xlink:to="Locator_cmcsa_CcclParentMember_3796" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3797" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CombinedCchmoParentsMember" xlink:label="Locator_cmcsa_CombinedCchmoParentsMember_3798" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3797" xlink:to="Locator_cmcsa_CombinedCchmoParentsMember_3798" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3799" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NbcuniversalMediaParentMember" xlink:label="Locator_cmcsa_NbcuniversalMediaParentMember_3800" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3799" xlink:to="Locator_cmcsa_NbcuniversalMediaParentMember_3800" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3801" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ComcastNonGuarantorSubsidiariesMember" xlink:label="Locator_cmcsa_ComcastNonGuarantorSubsidiariesMember_3802" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3801" xlink:to="Locator_cmcsa_ComcastNonGuarantorSubsidiariesMember_3802" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3791" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ParentCompanyMember" xlink:label="Locator_us-gaap_ParentCompanyMember_3792" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3791" xlink:to="Locator_us-gaap_ParentCompanyMember_3792" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3803" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_3804" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3803" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_3804" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_3805" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivities_3806" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_3805" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivities_3806" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3807" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3808" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3807" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3808" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3809" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NetTransactionsWithAffiliates" xlink:label="Locator_cmcsa_NetTransactionsWithAffiliates_3810" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3809" xlink:to="Locator_cmcsa_NetTransactionsWithAffiliates_3810" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3811" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="Locator_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_3812" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3811" xlink:to="Locator_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_3812" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3813" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireIntangibleAssets" xlink:label="Locator_us-gaap_PaymentsToAcquireIntangibleAssets_3814" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3813" xlink:to="Locator_us-gaap_PaymentsToAcquireIntangibleAssets_3814" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3815" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_PaymentsForAcquisitionsAndConstructionOfRealEstateProperties" xlink:label="Locator_cmcsa_PaymentsForAcquisitionsAndConstructionOfRealEstateProperties_3816" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3815" xlink:to="Locator_cmcsa_PaymentsForAcquisitionsAndConstructionOfRealEstateProperties_3816" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3817" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="Locator_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_3818" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3817" xlink:to="Locator_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_3818" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3819" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ProceedsFromSalesOfBusinessesAndInvestments" xlink:label="Locator_cmcsa_ProceedsFromSalesOfBusinessesAndInvestments_3820" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3819" xlink:to="Locator_cmcsa_ProceedsFromSalesOfBusinessesAndInvestments_3820" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3821" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital" xlink:label="Locator_us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital_3822" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3821" xlink:to="Locator_us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital_3822" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3823" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireInvestments" xlink:label="Locator_us-gaap_PaymentsToAcquireInvestments_3824" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3823" xlink:to="Locator_us-gaap_PaymentsToAcquireInvestments_3824" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3825" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities" xlink:label="Locator_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_3826" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3825" xlink:to="Locator_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_3826" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3827" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivities_3828" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_3827" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivities_3828" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3829" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3830" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3829" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3830" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3831" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromRepaymentsOfShortTermDebt" xlink:label="Locator_us-gaap_ProceedsFromRepaymentsOfShortTermDebt_3832" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3831" xlink:to="Locator_us-gaap_ProceedsFromRepaymentsOfShortTermDebt_3832" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3833" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt" xlink:label="Locator_us-gaap_ProceedsFromIssuanceOfLongTermDebt_3834" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3833" xlink:to="Locator_us-gaap_ProceedsFromIssuanceOfLongTermDebt_3834" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3835" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RepaymentsOfOtherDebt" xlink:label="Locator_us-gaap_RepaymentsOfOtherDebt_3836" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3835" xlink:to="Locator_us-gaap_RepaymentsOfOtherDebt_3836" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3837" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="Locator_us-gaap_PaymentsForRepurchaseOfCommonStock_3838" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3837" xlink:to="Locator_us-gaap_PaymentsForRepurchaseOfCommonStock_3838" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3839" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsOfDividends" xlink:label="Locator_us-gaap_PaymentsOfDividends_3840" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3839" xlink:to="Locator_us-gaap_PaymentsOfDividends_3840" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3841" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="Locator_us-gaap_ProceedsFromIssuanceOfCommonStock_3842" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3841" xlink:to="Locator_us-gaap_ProceedsFromIssuanceOfCommonStock_3842" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3843" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries" xlink:label="Locator_us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries_3844" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3843" xlink:to="Locator_us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries_3844" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3845" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DistributionsToNoncontrollingInterestsAndDividendsForRedeemableSubsidiaryPreferredStock" xlink:label="Locator_cmcsa_DistributionsToNoncontrollingInterestsAndDividendsForRedeemableSubsidiaryPreferredStock_3846" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3845" xlink:to="Locator_cmcsa_DistributionsToNoncontrollingInterestsAndDividendsForRedeemableSubsidiaryPreferredStock_3846" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3847" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders" xlink:label="Locator_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_3848" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3847" xlink:to="Locator_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_3848" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3849" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SettlementOfStationVentureLiability" xlink:label="Locator_cmcsa_SettlementOfStationVentureLiability_3850" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3849" xlink:to="Locator_cmcsa_SettlementOfStationVentureLiability_3850" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3851" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities" xlink:label="Locator_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_3852" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3851" xlink:to="Locator_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_3852" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3853" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivities_3854" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3853" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivities_3854" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3855" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="Locator_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_3856" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3855" xlink:to="Locator_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_3856" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3857" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="Locator_us-gaap_CashAndCashEquivalentsAtCarryingValue_3858" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3857" xlink:to="Locator_us-gaap_CashAndCashEquivalentsAtCarryingValue_3858" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3731" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3732" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3731" xlink:to="Locator_us-gaap_StatementTable_3732" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/CondensedConsolidatedFinancialStatements">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3889" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3890" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3889" xlink:to="Locator_dei_LegalEntityAxis_3890" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3891" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3892" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_3891" xlink:to="Locator_dei_EntityDomain_3892" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3893" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_3894" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3893" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_3894" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3895" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock" xlink:label="Locator_us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock_3896" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3895" xlink:to="Locator_us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock_3896" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3885" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3886" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3885" xlink:to="Locator_us-gaap_StatementTable_3886" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/AccountingPolicies">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3911" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3912" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3911" xlink:to="Locator_dei_LegalEntityAxis_3912" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3913" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3914" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_3913" xlink:to="Locator_dei_EntityDomain_3914" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3915" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_3916" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3915" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_3916" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3917" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SignificantAccountingPoliciesTextBlock" xlink:label="Locator_us-gaap_SignificantAccountingPoliciesTextBlock_3918" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3917" xlink:to="Locator_us-gaap_SignificantAccountingPoliciesTextBlock_3918" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3907" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3908" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3907" xlink:to="Locator_us-gaap_StatementTable_3908" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosurePropertyAndEquipment">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3929" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3930" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3929" xlink:to="Locator_dei_LegalEntityAxis_3930" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3931" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3932" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_3931" xlink:to="Locator_dei_EntityDomain_3932" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3933" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_3934" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3933" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_3934" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3935" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_3936" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3935" xlink:to="Locator_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_3936" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3937" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3938" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3937" xlink:to="Locator_us-gaap_StatementTable_3938" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefits">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3951" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3952" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3951" xlink:to="Locator_dei_LegalEntityAxis_3952" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3953" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3954" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_3953" xlink:to="Locator_dei_EntityDomain_3954" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3955" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_3956" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3955" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_3956" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3957" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock" xlink:label="Locator_us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_3958" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3957" xlink:to="Locator_us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_3958" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3959" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3960" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3959" xlink:to="Locator_us-gaap_StatementTable_3960" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureShareBasedCompensation">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3973" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3974" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3973" xlink:to="Locator_dei_LegalEntityAxis_3974" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3975" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3976" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_3975" xlink:to="Locator_dei_EntityDomain_3976" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3977" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_3978" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3977" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_3978" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3979" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:label="Locator_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_3980" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3979" xlink:to="Locator_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_3980" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3981" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3982" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3981" xlink:to="Locator_us-gaap_StatementTable_3982" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureIncomeTaxes">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3995" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3996" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3995" xlink:to="Locator_dei_LegalEntityAxis_3996" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3997" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3998" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_3997" xlink:to="Locator_dei_EntityDomain_3998" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3999" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4000" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3999" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4000" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4001" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxDisclosureTextBlock" xlink:label="Locator_us-gaap_IncomeTaxDisclosureTextBlock_4002" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4001" xlink:to="Locator_us-gaap_IncomeTaxDisclosureTextBlock_4002" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4003" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4004" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4003" xlink:to="Locator_us-gaap_StatementTable_4004" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureQuarterlyFinancialInformation">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4017" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4018" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4017" xlink:to="Locator_dei_LegalEntityAxis_4018" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4019" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4020" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4019" xlink:to="Locator_dei_EntityDomain_4020" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4021" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4022" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4021" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4022" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4023" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_QuarterlyFinancialInformationTextBlock" xlink:label="Locator_us-gaap_QuarterlyFinancialInformationTextBlock_4024" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4023" xlink:to="Locator_us-gaap_QuarterlyFinancialInformationTextBlock_4024" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4025" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4026" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4025" xlink:to="Locator_us-gaap_StatementTable_4026" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureAccountingPoliciesPolicy">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4077" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4078" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4077" xlink:to="Locator_dei_LegalEntityAxis_4078" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4079" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4080" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4079" xlink:to="Locator_dei_EntityDomain_4080" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4081" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4082" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4081" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4082" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4083" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConsolidationPolicyTextBlock" xlink:label="Locator_us-gaap_ConsolidationPolicyTextBlock_4084" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4083" xlink:to="Locator_us-gaap_ConsolidationPolicyTextBlock_4084" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4085" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock" xlink:label="Locator_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_4086" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4085" xlink:to="Locator_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_4086" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4087" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsPolicyTextBlock" xlink:label="Locator_us-gaap_CashAndCashEquivalentsPolicyTextBlock_4088" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4087" xlink:to="Locator_us-gaap_CashAndCashEquivalentsPolicyTextBlock_4088" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4089" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_UseOfEstimates" xlink:label="Locator_us-gaap_UseOfEstimates_4090" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4089" xlink:to="Locator_us-gaap_UseOfEstimates_4090" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4091" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FilmAndTelevisionCostsPolicyTextBlock" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsPolicyTextBlock_4092" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4091" xlink:to="Locator_cmcsa_FilmAndTelevisionCostsPolicyTextBlock_4092" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4093" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentPolicyTextBlock" xlink:label="Locator_us-gaap_InvestmentPolicyTextBlock_4094" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4093" xlink:to="Locator_us-gaap_InvestmentPolicyTextBlock_4094" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4095" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentPolicyTextBlock" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_4096" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4095" xlink:to="Locator_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_4096" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4097" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock" xlink:label="Locator_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_4098" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4097" xlink:to="Locator_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_4098" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4099" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetRetirementObligationsAndEnvironmentalCostPolicyTextBlock" xlink:label="Locator_us-gaap_AssetRetirementObligationsAndEnvironmentalCostPolicyTextBlock_4100" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4099" xlink:to="Locator_us-gaap_AssetRetirementObligationsAndEnvironmentalCostPolicyTextBlock_4100" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4101" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RevenueRecognitionPolicyTextBlock" xlink:label="Locator_us-gaap_RevenueRecognitionPolicyTextBlock_4102" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4101" xlink:to="Locator_us-gaap_RevenueRecognitionPolicyTextBlock_4102" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4103" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CableCommunicationsProgrammingExpensesPolicyTextBlock" xlink:label="Locator_cmcsa_CableCommunicationsProgrammingExpensesPolicyTextBlock_4104" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4103" xlink:to="Locator_cmcsa_CableCommunicationsProgrammingExpensesPolicyTextBlock_4104" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4105" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdvertisingCostPolicyExpensedAdvertisingCost" xlink:label="Locator_us-gaap_AdvertisingCostPolicyExpensedAdvertisingCost_4106" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4105" xlink:to="Locator_us-gaap_AdvertisingCostPolicyExpensedAdvertisingCost_4106" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4107" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CompensationRelatedCostsPolicyTextBlock" xlink:label="Locator_us-gaap_CompensationRelatedCostsPolicyTextBlock_4108" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4107" xlink:to="Locator_us-gaap_CompensationRelatedCostsPolicyTextBlock_4108" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4109" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PensionAndOtherPostretirementPlansPolicy" xlink:label="Locator_us-gaap_PensionAndOtherPostretirementPlansPolicy_4110" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4109" xlink:to="Locator_us-gaap_PensionAndOtherPostretirementPlansPolicy_4110" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4111" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxPolicyTextBlock" xlink:label="Locator_us-gaap_IncomeTaxPolicyTextBlock_4112" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4111" xlink:to="Locator_us-gaap_IncomeTaxPolicyTextBlock_4112" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4113" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativesPolicyTextBlock" xlink:label="Locator_us-gaap_DerivativesPolicyTextBlock_4114" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4113" xlink:to="Locator_us-gaap_DerivativesPolicyTextBlock_4114" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4115" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EarningsPerSharePolicyTextBlock" xlink:label="Locator_us-gaap_EarningsPerSharePolicyTextBlock_4116" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4115" xlink:to="Locator_us-gaap_EarningsPerSharePolicyTextBlock_4116" order="17.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4117" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueOfFinancialInstrumentsPolicy" xlink:label="Locator_us-gaap_FairValueOfFinancialInstrumentsPolicy_4118" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4117" xlink:to="Locator_us-gaap_FairValueOfFinancialInstrumentsPolicy_4118" order="18.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4073" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4074" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4073" xlink:to="Locator_us-gaap_StatementTable_4074" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureSignificantTransactionsTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4141" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4142" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4141" xlink:to="Locator_dei_LegalEntityAxis_4142" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4143" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4144" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4143" xlink:to="Locator_dei_EntityDomain_4144" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4145" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4146" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4145" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4146" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4147" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ScheduleOfPurchasePriceAllocationTableTextBlock1PolicyTextBlock" xlink:label="Locator_cmcsa_ScheduleOfPurchasePriceAllocationTableTextBlock1PolicyTextBlock_4148" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4147" xlink:to="Locator_cmcsa_ScheduleOfPurchasePriceAllocationTableTextBlock1PolicyTextBlock_4148" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4149" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ContingentConsiderationTableTextBlock" xlink:label="Locator_cmcsa_ContingentConsiderationTableTextBlock_4150" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4149" xlink:to="Locator_cmcsa_ContingentConsiderationTableTextBlock_4150" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4151" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ScheduleOfAcquisitionRelatedExpensesIncludedInConsolidatedStatementOfIncomeTableTextBlock" xlink:label="Locator_cmcsa_ScheduleOfAcquisitionRelatedExpensesIncludedInConsolidatedStatementOfIncomeTableTextBlock_4152" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4151" xlink:to="Locator_cmcsa_ScheduleOfAcquisitionRelatedExpensesIncludedInConsolidatedStatementOfIncomeTableTextBlock_4152" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4153" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionProFormaInformationTextBlock" xlink:label="Locator_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_4154" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4153" xlink:to="Locator_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_4154" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4137" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4138" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4137" xlink:to="Locator_us-gaap_StatementTable_4138" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureInvestmentsTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4177" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4178" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4177" xlink:to="Locator_dei_LegalEntityAxis_4178" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4179" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4180" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4179" xlink:to="Locator_dei_EntityDomain_4180" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4181" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4182" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4181" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4182" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4183" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SummaryInvestmentHoldingsTextBlock" xlink:label="Locator_us-gaap_SummaryInvestmentHoldingsTextBlock_4184" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4183" xlink:to="Locator_us-gaap_SummaryInvestmentHoldingsTextBlock_4184" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4185" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvestmentsTextBlock" xlink:label="Locator_us-gaap_EquityMethodInvestmentsTextBlock_4186" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4185" xlink:to="Locator_us-gaap_EquityMethodInvestmentsTextBlock_4186" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4187" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ComponentsOfInvestmentIncomeLossNetTableTextBlock" xlink:label="Locator_cmcsa_ComponentsOfInvestmentIncomeLossNetTableTextBlock_4188" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4187" xlink:to="Locator_cmcsa_ComponentsOfInvestmentIncomeLossNetTableTextBlock_4188" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4189" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock_4190" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4189" xlink:to="Locator_us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock_4190" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4191" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_PrepaidForwardSaleAgreementsTableTextBlock" xlink:label="Locator_cmcsa_PrepaidForwardSaleAgreementsTableTextBlock_4192" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4191" xlink:to="Locator_cmcsa_PrepaidForwardSaleAgreementsTableTextBlock_4192" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4173" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4174" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4173" xlink:to="Locator_us-gaap_StatementTable_4174" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosurePropertyAndEquipmentTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4203" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4204" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4203" xlink:to="Locator_dei_LegalEntityAxis_4204" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4205" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4206" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4205" xlink:to="Locator_dei_EntityDomain_4206" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4207" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4208" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4207" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4208" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4209" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTextBlock" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentTextBlock_4210" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4209" xlink:to="Locator_us-gaap_PropertyPlantAndEquipmentTextBlock_4210" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4211" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4212" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4211" xlink:to="Locator_us-gaap_StatementTable_4212" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/GoodwillTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4233" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4234" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4233" xlink:to="Locator_dei_LegalEntityAxis_4234" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4235" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4236" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4235" xlink:to="Locator_dei_EntityDomain_4236" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4237" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4238" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4237" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4238" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4239" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfGoodwillTextBlock" xlink:label="Locator_us-gaap_ScheduleOfGoodwillTextBlock_4240" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4239" xlink:to="Locator_us-gaap_ScheduleOfGoodwillTextBlock_4240" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4241" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IntangibleAssetsDisclosureTextBlock" xlink:label="Locator_us-gaap_IntangibleAssetsDisclosureTextBlock_4242" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4241" xlink:to="Locator_us-gaap_IntangibleAssetsDisclosureTextBlock_4242" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4243" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock" xlink:label="Locator_us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_4244" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4243" xlink:to="Locator_us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_4244" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4229" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4230" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4229" xlink:to="Locator_us-gaap_StatementTable_4230" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureLongTermDebtTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4267" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4268" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4267" xlink:to="Locator_dei_LegalEntityAxis_4268" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4269" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4270" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4269" xlink:to="Locator_dei_EntityDomain_4270" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4271" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4272" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4271" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4272" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4273" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfDebtTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfDebtTableTextBlock_4274" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4273" xlink:to="Locator_us-gaap_ScheduleOfDebtTableTextBlock_4274" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4275" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_4276" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4275" xlink:to="Locator_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_4276" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4277" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DebtBorrowingsTableTextBlock" xlink:label="Locator_cmcsa_DebtBorrowingsTableTextBlock_4278" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4277" xlink:to="Locator_cmcsa_DebtBorrowingsTableTextBlock_4278" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4279" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DebtRepaymentsAndRepurchasesTableTextBlock" xlink:label="Locator_cmcsa_DebtRepaymentsAndRepurchasesTableTextBlock_4280" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4279" xlink:to="Locator_cmcsa_DebtRepaymentsAndRepurchasesTableTextBlock_4280" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4281" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ChangeInCarryingValueOfDebtComponentAndChangeInFairValueOfDerivativeComponentTableTextBlock" xlink:label="Locator_cmcsa_ChangeInCarryingValueOfDebtComponentAndChangeInFairValueOfDerivativeComponentTableTextBlock_4282" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4281" xlink:to="Locator_cmcsa_ChangeInCarryingValueOfDebtComponentAndChangeInFairValueOfDerivativeComponentTableTextBlock_4282" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4263" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4264" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4263" xlink:to="Locator_us-gaap_StatementTable_4264" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureFairValueMeasurementsTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4295" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4296" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4295" xlink:to="Locator_dei_LegalEntityAxis_4296" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4297" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4298" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4297" xlink:to="Locator_dei_EntityDomain_4298" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4299" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4300" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4299" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4300" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4301" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_4302" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4301" xlink:to="Locator_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_4302" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4303" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock" xlink:label="Locator_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_4304" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4303" xlink:to="Locator_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_4304" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4305" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4306" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4305" xlink:to="Locator_us-gaap_StatementTable_4306" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureNoncontrollingInterestsTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4323" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4324" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4323" xlink:to="Locator_dei_LegalEntityAxis_4324" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4325" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4326" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4325" xlink:to="Locator_dei_EntityDomain_4326" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4327" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4328" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4327" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4328" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4329" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetTextBlock" xlink:label="Locator_us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetTextBlock_4330" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4329" xlink:to="Locator_us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetTextBlock_4330" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4319" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4320" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4319" xlink:to="Locator_us-gaap_StatementTable_4320" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosurePostretirementPensionAndOtherEmployeeBenefitPlansTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4351" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4352" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4351" xlink:to="Locator_dei_LegalEntityAxis_4352" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4353" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4354" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4353" xlink:to="Locator_dei_EntityDomain_4354" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4355" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4356" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4355" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4356" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4357" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CondensedInformationOnOurPostretirementAndPensionBenefitPlansTextBlock" xlink:label="Locator_cmcsa_CondensedInformationOnOurPostretirementAndPensionBenefitPlansTextBlock_4358" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4357" xlink:to="Locator_cmcsa_CondensedInformationOnOurPostretirementAndPensionBenefitPlansTextBlock_4358" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4359" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DeferredCompensationPlansTextBlock" xlink:label="Locator_cmcsa_DeferredCompensationPlansTextBlock_4360" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4359" xlink:to="Locator_cmcsa_DeferredCompensationPlansTextBlock_4360" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4361" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ScheduleOfBenefitObligationAndExpenseForOurSplitDollarLifeInsuranceAgreementsTextBlock" xlink:label="Locator_cmcsa_ScheduleOfBenefitObligationAndExpenseForOurSplitDollarLifeInsuranceAgreementsTextBlock_4362" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4361" xlink:to="Locator_cmcsa_ScheduleOfBenefitObligationAndExpenseForOurSplitDollarLifeInsuranceAgreementsTextBlock_4362" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4363" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfNetBenefitCostsTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_4364" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4363" xlink:to="Locator_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_4364" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4365" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock_4366" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4365" xlink:to="Locator_us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock_4366" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4367" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CondensedInformationOnOurPensionBenefitPlansTextBlock" xlink:label="Locator_cmcsa_CondensedInformationOnOurPensionBenefitPlansTextBlock_4368" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4367" xlink:to="Locator_cmcsa_CondensedInformationOnOurPensionBenefitPlansTextBlock_4368" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4369" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4370" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4369" xlink:to="Locator_us-gaap_StatementTable_4370" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureEquityTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4391" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4392" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4391" xlink:to="Locator_dei_LegalEntityAxis_4392" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4393" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4394" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4393" xlink:to="Locator_dei_EntityDomain_4394" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4395" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4396" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4395" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4396" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4397" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ChangesInCommonStockTextBlock" xlink:label="Locator_cmcsa_ChangesInCommonStockTextBlock_4398" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4397" xlink:to="Locator_cmcsa_ChangesInCommonStockTextBlock_4398" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4399" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_AggregateShareRepurchasesTextBlock" xlink:label="Locator_cmcsa_AggregateShareRepurchasesTextBlock_4400" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4399" xlink:to="Locator_cmcsa_AggregateShareRepurchasesTextBlock_4400" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4401" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ScheduleOfDividendsTextBlock" xlink:label="Locator_cmcsa_ScheduleOfDividendsTextBlock_4402" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4401" xlink:to="Locator_cmcsa_ScheduleOfDividendsTextBlock_4402" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4387" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4388" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4387" xlink:to="Locator_us-gaap_StatementTable_4388" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureShareBasedCompensationTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4425" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4426" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4425" xlink:to="Locator_dei_LegalEntityAxis_4426" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4427" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4428" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4427" xlink:to="Locator_dei_EntityDomain_4428" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4429" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4430" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4429" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4430" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4431" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock_4432" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4431" xlink:to="Locator_us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock_4432" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4433" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_StockOptionActivityTextBlock" xlink:label="Locator_cmcsa_StockOptionActivityTextBlock_4434" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4433" xlink:to="Locator_cmcsa_StockOptionActivityTextBlock_4434" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4435" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_StockOptionFairValueAndSignificantAssumptionsTextBlock" xlink:label="Locator_cmcsa_StockOptionFairValueAndSignificantAssumptionsTextBlock_4436" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4435" xlink:to="Locator_cmcsa_StockOptionFairValueAndSignificantAssumptionsTextBlock_4436" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4437" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ExercisedStockOptionsTextBlock" xlink:label="Locator_cmcsa_ExercisedStockOptionsTextBlock_4438" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4437" xlink:to="Locator_cmcsa_ExercisedStockOptionsTextBlock_4438" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4439" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_WeightedAverageFairValueOfRestrictedStockUnitsTextBlock" xlink:label="Locator_cmcsa_WeightedAverageFairValueOfRestrictedStockUnitsTextBlock_4440" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4439" xlink:to="Locator_cmcsa_WeightedAverageFairValueOfRestrictedStockUnitsTextBlock_4440" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4441" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_RestrictedStockPlanActivityTextBlock" xlink:label="Locator_cmcsa_RestrictedStockPlanActivityTextBlock_4442" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4441" xlink:to="Locator_cmcsa_RestrictedStockPlanActivityTextBlock_4442" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4443" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_VestedRestrictedShareUnitsTextBlock" xlink:label="Locator_cmcsa_VestedRestrictedShareUnitsTextBlock_4444" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4443" xlink:to="Locator_cmcsa_VestedRestrictedShareUnitsTextBlock_4444" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4445" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4446" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4445" xlink:to="Locator_us-gaap_StatementTable_4446" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureIncomeTaxesTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4465" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4466" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4465" xlink:to="Locator_dei_LegalEntityAxis_4466" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4467" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4468" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4467" xlink:to="Locator_dei_EntityDomain_4468" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4469" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4470" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4469" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4470" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4471" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_4472" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4471" xlink:to="Locator_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_4472" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4473" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_4474" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4473" xlink:to="Locator_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_4474" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4475" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_4476" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4475" xlink:to="Locator_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_4476" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4477" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SummaryOfIncomeTaxContingenciesTextBlock" xlink:label="Locator_us-gaap_SummaryOfIncomeTaxContingenciesTextBlock_4478" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4477" xlink:to="Locator_us-gaap_SummaryOfIncomeTaxContingenciesTextBlock_4478" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4479" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4480" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4479" xlink:to="Locator_us-gaap_StatementTable_4480" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureSupplementalFinancialInformationTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4501" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4502" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4501" xlink:to="Locator_dei_LegalEntityAxis_4502" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4503" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4504" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4503" xlink:to="Locator_dei_EntityDomain_4504" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4505" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4506" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4505" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4506" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4507" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock_4508" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4507" xlink:to="Locator_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock_4508" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4509" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_4510" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4509" xlink:to="Locator_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_4510" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4511" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ScheduleOfOtherOperatingCostAndExpenseByComponentTableTextBlock" xlink:label="Locator_cmcsa_ScheduleOfOtherOperatingCostAndExpenseByComponentTableTextBlock_4512" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4511" xlink:to="Locator_cmcsa_ScheduleOfOtherOperatingCostAndExpenseByComponentTableTextBlock_4512" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4513" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ScheduleOfAdjustmentsToReconcileNetIncomeToNetCashProvidedByOperatingActivitiesTableTextBlock" xlink:label="Locator_cmcsa_ScheduleOfAdjustmentsToReconcileNetIncomeToNetCashProvidedByOperatingActivitiesTableTextBlock_4514" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4513" xlink:to="Locator_cmcsa_ScheduleOfAdjustmentsToReconcileNetIncomeToNetCashProvidedByOperatingActivitiesTableTextBlock_4514" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4515" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock_4516" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4515" xlink:to="Locator_us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock_4516" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4517" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4518" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4517" xlink:to="Locator_us-gaap_StatementTable_4518" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureCommitmentsAndContingenciesTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4539" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4540" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4539" xlink:to="Locator_dei_LegalEntityAxis_4540" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4541" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4542" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4541" xlink:to="Locator_dei_EntityDomain_4542" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4543" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4544" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4543" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4544" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4545" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ContractualObligationFiscalYearMaturityScheduleTableTextBlock" xlink:label="Locator_us-gaap_ContractualObligationFiscalYearMaturityScheduleTableTextBlock_4546" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4545" xlink:to="Locator_us-gaap_ContractualObligationFiscalYearMaturityScheduleTableTextBlock_4546" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4547" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_RentalExpenseTableTextBlock" xlink:label="Locator_cmcsa_RentalExpenseTableTextBlock_4548" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4547" xlink:to="Locator_cmcsa_RentalExpenseTableTextBlock_4548" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4549" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommitmentsDisclosureTextBlock" xlink:label="Locator_us-gaap_CommitmentsDisclosureTextBlock_4550" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4549" xlink:to="Locator_us-gaap_CommitmentsDisclosureTextBlock_4550" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4535" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4536" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4535" xlink:to="Locator_us-gaap_StatementTable_4536" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureFinancialDataByBusinessSegmentTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4571" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4572" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4571" xlink:to="Locator_dei_LegalEntityAxis_4572" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4573" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4574" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4573" xlink:to="Locator_dei_EntityDomain_4574" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4575" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4576" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4575" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4576" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4577" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock" xlink:label="Locator_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_4578" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4577" xlink:to="Locator_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_4578" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4579" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CableSegmentAndCorporateAndOtherReclassificationTextBlock" xlink:label="Locator_cmcsa_CableSegmentAndCorporateAndOtherReclassificationTextBlock_4580" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4579" xlink:to="Locator_cmcsa_CableSegmentAndCorporateAndOtherReclassificationTextBlock_4580" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4581" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock" xlink:label="Locator_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock_4582" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4581" xlink:to="Locator_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock_4582" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4583" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RevenueFromExternalCustomersByGeographicAreasTableTextBlock" xlink:label="Locator_us-gaap_RevenueFromExternalCustomersByGeographicAreasTableTextBlock_4584" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4583" xlink:to="Locator_us-gaap_RevenueFromExternalCustomersByGeographicAreasTableTextBlock_4584" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4567" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4568" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4567" xlink:to="Locator_us-gaap_StatementTable_4568" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureBusinessAndBasisOfPresentationDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4607" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="Locator_us-gaap_StatementBusinessSegmentsAxis_4608" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4607" xlink:to="Locator_us-gaap_StatementBusinessSegmentsAxis_4608" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="Locator_us-gaap_StatementBusinessSegmentsAxis_4611" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_4612" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_StatementBusinessSegmentsAxis_4611" xlink:to="Locator_us-gaap_SegmentDomain_4612" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_4613" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_VideoCustomersMember" xlink:label="Locator_cmcsa_VideoCustomersMember_4614" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_4613" xlink:to="Locator_cmcsa_VideoCustomersMember_4614" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_4615" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_HighSpeedInternetCustomersMember" xlink:label="Locator_cmcsa_HighSpeedInternetCustomersMember_4616" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_4615" xlink:to="Locator_cmcsa_HighSpeedInternetCustomersMember_4616" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_4617" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_VoiceCustomersMember" xlink:label="Locator_cmcsa_VoiceCustomersMember_4618" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_4617" xlink:to="Locator_cmcsa_VoiceCustomersMember_4618" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_4619" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_UniversalStudiosJapanMember" xlink:label="Locator_cmcsa_UniversalStudiosJapanMember_4620" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_4619" xlink:to="Locator_cmcsa_UniversalStudiosJapanMember_4620" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4609" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4610" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4609" xlink:to="Locator_dei_LegalEntityAxis_4610" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4621" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4622" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4621" xlink:to="Locator_dei_EntityDomain_4622" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4623" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4624" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4623" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4624" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4625" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NumberOfCustomers" xlink:label="Locator_cmcsa_NumberOfCustomers_4626" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4625" xlink:to="Locator_cmcsa_NumberOfCustomers_4626" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4627" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Totalcustomerrelationships" xlink:label="Locator_cmcsa_Totalcustomerrelationships_4628" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4627" xlink:to="Locator_cmcsa_Totalcustomerrelationships_4628" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4629" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_OwnershipPercentageInNewCompany" xlink:label="Locator_cmcsa_OwnershipPercentageInNewCompany_4630" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4629" xlink:to="Locator_cmcsa_OwnershipPercentageInNewCompany_4630" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4603" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4604" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4603" xlink:to="Locator_us-gaap_StatementTable_4604" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureAccountingPoliciesNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4655" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4656" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4655" xlink:to="Locator_dei_LegalEntityAxis_4656" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4657" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4658" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4657" xlink:to="Locator_dei_EntityDomain_4658" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4659" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4660" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4659" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4660" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4653" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4654" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4653" xlink:to="Locator_us-gaap_StatementTable_4654" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureGoodwillAndOtherIntangibleAssetsAmortizationOfIntangibleAssetsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4683" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4684" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4683" xlink:to="Locator_dei_LegalEntityAxis_4684" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4685" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4686" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4685" xlink:to="Locator_dei_EntityDomain_4686" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4687" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4688" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4687" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4688" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4689" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:label="Locator_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_4690" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4689" xlink:to="Locator_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_4690" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4691" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:label="Locator_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_4692" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4691" xlink:to="Locator_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_4692" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4693" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:label="Locator_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_4694" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4693" xlink:to="Locator_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_4694" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4695" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:label="Locator_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_4696" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4695" xlink:to="Locator_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_4696" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4697" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:label="Locator_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_4698" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4697" xlink:to="Locator_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_4698" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4679" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4680" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4679" xlink:to="Locator_us-gaap_StatementTable_4680" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureShareBasedCompensationNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4757" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="Locator_us-gaap_AwardTypeAxis_4758" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4757" xlink:to="Locator_us-gaap_AwardTypeAxis_4758" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="Locator_us-gaap_AwardTypeAxis_4761" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4762" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_AwardTypeAxis_4761" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4762" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4763" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="Locator_us-gaap_RestrictedStockUnitsRSUMember_4764" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4763" xlink:to="Locator_us-gaap_RestrictedStockUnitsRSUMember_4764" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4765" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="Locator_us-gaap_EmployeeStockOptionMember_4766" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4765" xlink:to="Locator_us-gaap_EmployeeStockOptionMember_4766" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4759" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4760" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4759" xlink:to="Locator_dei_LegalEntityAxis_4760" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4767" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4768" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4767" xlink:to="Locator_dei_EntityDomain_4768" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4769" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4770" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4769" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4770" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4771" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_StockOptionsGranted" xlink:label="Locator_cmcsa_StockOptionsGranted_4772" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4771" xlink:to="Locator_cmcsa_StockOptionsGranted_4772" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4773" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_RestrictedShareUnitsGranted" xlink:label="Locator_cmcsa_RestrictedShareUnitsGranted_4774" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4773" xlink:to="Locator_cmcsa_RestrictedShareUnitsGranted_4774" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4775" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FairValueOfStockOptionsGranted" xlink:label="Locator_cmcsa_FairValueOfStockOptionsGranted_4776" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4775" xlink:to="Locator_cmcsa_FairValueOfStockOptionsGranted_4776" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4777" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FairValueOfRestrictedShareUnitsGranted" xlink:label="Locator_cmcsa_FairValueOfRestrictedShareUnitsGranted_4778" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4777" xlink:to="Locator_cmcsa_FairValueOfRestrictedShareUnitsGranted_4778" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4779" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="Locator_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_4780" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4779" xlink:to="Locator_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_4780" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4781" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="Locator_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_4782" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4781" xlink:to="Locator_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_4782" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4783" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ExcessCashIncomeTaxBenefit" xlink:label="Locator_cmcsa_ExcessCashIncomeTaxBenefit_4784" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4783" xlink:to="Locator_cmcsa_ExcessCashIncomeTaxBenefit_4784" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4785" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationDate" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationDate_4786" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4785" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationDate_4786" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4787" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_StockOptionLiquidityProgramExpirationDating" xlink:label="Locator_cmcsa_StockOptionLiquidityProgramExpirationDating_4788" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4787" xlink:to="Locator_cmcsa_StockOptionLiquidityProgramExpirationDating_4788" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4789" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriodMaximum" xlink:label="Locator_cmcsa_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriodMaximum_4790" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4789" xlink:to="Locator_cmcsa_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriodMaximum_4790" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4791" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:label="Locator_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_4792" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4791" xlink:to="Locator_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_4792" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4793" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_4794" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4793" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_4794" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4795" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_4796" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4795" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_4796" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4797" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_StockOptionLiquidityProgramOutstandingNumber" xlink:label="Locator_cmcsa_StockOptionLiquidityProgramOutstandingNumber_4798" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4797" xlink:to="Locator_cmcsa_StockOptionLiquidityProgramOutstandingNumber_4798" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4799" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NumberOfEntitledCommonStockSharesForEachRestrictedShareUnitAtTimeOfVesting" xlink:label="Locator_cmcsa_NumberOfEntitledCommonStockSharesForEachRestrictedShareUnitAtTimeOfVesting_4800" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4799" xlink:to="Locator_cmcsa_NumberOfEntitledCommonStockSharesForEachRestrictedShareUnitAtTimeOfVesting_4800" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4801" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ShareBasedCompensationArrangementsByShareBasedPaymentAwardDiscountFromMarketPrice" xlink:label="Locator_cmcsa_ShareBasedCompensationArrangementsByShareBasedPaymentAwardDiscountFromMarketPrice_4802" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4801" xlink:to="Locator_cmcsa_ShareBasedCompensationArrangementsByShareBasedPaymentAwardDiscountFromMarketPrice_4802" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4803" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_StockOptionLiquidityProgramOutstandingWeightedAverageExercisePrice" xlink:label="Locator_cmcsa_StockOptionLiquidityProgramOutstandingWeightedAverageExercisePrice_4804" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4803" xlink:to="Locator_cmcsa_StockOptionLiquidityProgramOutstandingWeightedAverageExercisePrice_4804" order="17.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4805" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions" xlink:label="Locator_us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions_4806" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4805" xlink:to="Locator_us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions_4806" order="18.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4807" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_EmployeePayrollDeductionsForSharePurchasesThroughEmployeeStockPurchasePlan" xlink:label="Locator_cmcsa_EmployeePayrollDeductionsForSharePurchasesThroughEmployeeStockPurchasePlan_4808" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4807" xlink:to="Locator_cmcsa_EmployeePayrollDeductionsForSharePurchasesThroughEmployeeStockPurchasePlan_4808" order="19.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4811" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod" xlink:label="Locator_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_4812" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4811" xlink:to="Locator_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_4812" order="21.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4809" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityOther" xlink:label="Locator_us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityOther_4810" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4809" xlink:to="Locator_us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityOther_4810" order="20.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4753" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4754" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4753" xlink:to="Locator_us-gaap_StatementTable_4754" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureIncomeTaxesNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4859" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsAxis" xlink:label="Locator_cmcsa_TaxAdjustmentsAxis_4860" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4859" xlink:to="Locator_cmcsa_TaxAdjustmentsAxis_4860" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsAxis" xlink:label="Locator_cmcsa_TaxAdjustmentsAxis_4863" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_4864" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_TaxAdjustmentsAxis_4863" xlink:to="Locator_cmcsa_TaxAdjustmentsDomain_4864" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsAxis" xlink:label="Locator_cmcsa_TaxAdjustmentsAxis_4909" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_4910" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_cmcsa_TaxAdjustmentsAxis_4909" xlink:to="Locator_cmcsa_TaxAdjustmentsDomain_4910" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_4865" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeMember" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeMember_4866" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_4865" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeMember_4866" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_4867" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ShareBasedCompensationMember" xlink:label="Locator_cmcsa_ShareBasedCompensationMember_4868" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_4867" xlink:to="Locator_cmcsa_ShareBasedCompensationMember_4868" order="2.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_4869" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DomesticCountryMember" xlink:label="Locator_us-gaap_DomesticCountryMember_4870" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_4869" xlink:to="Locator_us-gaap_DomesticCountryMember_4870" order="3.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_4871" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ForeignCountryMember" xlink:label="Locator_us-gaap_ForeignCountryMember_4872" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_4871" xlink:to="Locator_us-gaap_ForeignCountryMember_4872" order="4.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_4873" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_OtherAcquisitionsMember" xlink:label="Locator_cmcsa_OtherAcquisitionsMember_4874" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_4873" xlink:to="Locator_cmcsa_OtherAcquisitionsMember_4874" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4861" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4862" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4861" xlink:to="Locator_dei_LegalEntityAxis_4862" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4875" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4876" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4875" xlink:to="Locator_dei_EntityDomain_4876" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4877" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FranchiseRightsMember" xlink:label="Locator_us-gaap_FranchiseRightsMember_4878" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4877" xlink:to="Locator_us-gaap_FranchiseRightsMember_4878" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4879" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NbcuniversalMember" xlink:label="Locator_cmcsa_NbcuniversalMember_4880" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4879" xlink:to="Locator_cmcsa_NbcuniversalMember_4880" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4881" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_UncertainTaxPositionsIndemnifiedByGeMember" xlink:label="Locator_cmcsa_UncertainTaxPositionsIndemnifiedByGeMember_4882" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4881" xlink:to="Locator_cmcsa_UncertainTaxPositionsIndemnifiedByGeMember_4882" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4883" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign" xlink:label="Locator_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_4884" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4883" xlink:to="Locator_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_4884" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4885" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations" xlink:label="Locator_us-gaap_EffectiveIncomeTaxRateContinuingOperations_4886" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4885" xlink:to="Locator_us-gaap_EffectiveIncomeTaxRateContinuingOperations_4886" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4887" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings" xlink:label="Locator_us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings_4888" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4887" xlink:to="Locator_us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings_4888" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4889" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DeferredTaxLiabilityFranchiseRights" xlink:label="Locator_cmcsa_DeferredTaxLiabilityFranchiseRights_4890" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4889" xlink:to="Locator_cmcsa_DeferredTaxLiabilityFranchiseRights_4890" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4891" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLossCarryforwards" xlink:label="Locator_us-gaap_OperatingLossCarryforwards_4892" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4891" xlink:to="Locator_us-gaap_OperatingLossCarryforwards_4892" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4893" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLossCarryforwardsExpirationDate" xlink:label="Locator_us-gaap_OperatingLossCarryforwardsExpirationDate_4894" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4893" xlink:to="Locator_us-gaap_OperatingLossCarryforwardsExpirationDate_4894" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4895" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilityForUncertainTaxPositionsNoncurrent" xlink:label="Locator_us-gaap_LiabilityForUncertainTaxPositionsNoncurrent_4896" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4895" xlink:to="Locator_us-gaap_LiabilityForUncertainTaxPositionsNoncurrent_4896" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4897" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate" xlink:label="Locator_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_4898" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4897" xlink:to="Locator_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_4898" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4899" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued" xlink:label="Locator_us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued_4900" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4899" xlink:to="Locator_us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued_4900" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4901" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxesAssetLiabilityNet1" xlink:label="Locator_cmcsa_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxesAssetLiabilityNet1_4902" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4901" xlink:to="Locator_cmcsa_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxesAssetLiabilityNet1_4902" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4903" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_AcquisitionOfNoncontrollingInterestAssociatedTaxes" xlink:label="Locator_cmcsa_AcquisitionOfNoncontrollingInterestAssociatedTaxes_4904" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4903" xlink:to="Locator_cmcsa_AcquisitionOfNoncontrollingInterestAssociatedTaxes_4904" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4905" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ChangeInIncomeTaxExpenseRelatedToEffectivelySettledUncertainTaxPositions" xlink:label="Locator_cmcsa_ChangeInIncomeTaxExpenseRelatedToEffectivelySettledUncertainTaxPositions_4906" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4905" xlink:to="Locator_cmcsa_ChangeInIncomeTaxExpenseRelatedToEffectivelySettledUncertainTaxPositions_4906" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4907" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityOther" xlink:label="Locator_us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityOther_4908" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4907" xlink:to="Locator_us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityOther_4908" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4855" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4856" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4855" xlink:to="Locator_us-gaap_StatementTable_4856" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureInvestmentsInvestmentIncomeLossNetDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4971" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4972" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4971" xlink:to="Locator_dei_LegalEntityAxis_4972" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4973" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4974" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4973" xlink:to="Locator_dei_EntityDomain_4974" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4975" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RealizedInvestmentGainsLosses" xlink:label="Locator_us-gaap_RealizedInvestmentGainsLosses_4976" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4975" xlink:to="Locator_us-gaap_RealizedInvestmentGainsLosses_4976" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4977" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ImpairmentOfInvestments" xlink:label="Locator_us-gaap_ImpairmentOfInvestments_4978" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4977" xlink:to="Locator_us-gaap_ImpairmentOfInvestments_4978" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4979" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_UnrealizedGainLossOnSecurities" xlink:label="Locator_us-gaap_UnrealizedGainLossOnSecurities_4980" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4979" xlink:to="Locator_us-gaap_UnrealizedGainLossOnSecurities_4980" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4981" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_MarkToMarketAdjustmentOnDerivativeComponentOfPrepaidForwardSaleAgreements" xlink:label="Locator_cmcsa_MarkToMarketAdjustmentOnDerivativeComponentOfPrepaidForwardSaleAgreements_4982" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4981" xlink:to="Locator_cmcsa_MarkToMarketAdjustmentOnDerivativeComponentOfPrepaidForwardSaleAgreements_4982" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4983" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet" xlink:label="Locator_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_4984" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4983" xlink:to="Locator_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_4984" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4985" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentIncomeInterestAndDividend" xlink:label="Locator_us-gaap_InvestmentIncomeInterestAndDividend_4986" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4985" xlink:to="Locator_us-gaap_InvestmentIncomeInterestAndDividend_4986" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4987" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_OtherInvestmentIncomeLossNet" xlink:label="Locator_cmcsa_OtherInvestmentIncomeLossNet_4988" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4987" xlink:to="Locator_cmcsa_OtherInvestmentIncomeLossNet_4988" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4989" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentIncomeNonoperating" xlink:label="Locator_us-gaap_InvestmentIncomeNonoperating_4990" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4989" xlink:to="Locator_us-gaap_InvestmentIncomeNonoperating_4990" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4953" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4954" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4953" xlink:to="Locator_us-gaap_StatementTable_4954" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureFilmAndTelevisionCosts">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4999" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5000" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4999" xlink:to="Locator_dei_LegalEntityAxis_5000" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5001" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5002" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5001" xlink:to="Locator_dei_EntityDomain_5002" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5003" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5004" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5003" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5004" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5005" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FilmAndTelevisionCostsDisclosureTextBlock" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsDisclosureTextBlock_5006" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5005" xlink:to="Locator_cmcsa_FilmAndTelevisionCostsDisclosureTextBlock_5006" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5007" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5008" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5007" xlink:to="Locator_us-gaap_StatementTable_5008" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureFilmAndTelevisionCostsTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5021" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5022" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5021" xlink:to="Locator_dei_LegalEntityAxis_5022" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5023" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5024" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5023" xlink:to="Locator_dei_EntityDomain_5024" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5025" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5026" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5025" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5026" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5027" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ScheduleOfFilmAndTelevisionCostsTableTextBlock" xlink:label="Locator_cmcsa_ScheduleOfFilmAndTelevisionCostsTableTextBlock_5028" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5027" xlink:to="Locator_cmcsa_ScheduleOfFilmAndTelevisionCostsTableTextBlock_5028" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5029" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5030" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5029" xlink:to="Locator_us-gaap_StatementTable_5030" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureFilmAndTelevisionCostsNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5053" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5054" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5053" xlink:to="Locator_dei_LegalEntityAxis_5054" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5055" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5056" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5055" xlink:to="Locator_dei_EntityDomain_5056" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5057" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5058" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5057" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5058" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5059" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FilmCostsAmortizedInNextOperatingCycle" xlink:label="Locator_us-gaap_FilmCostsAmortizedInNextOperatingCycle_5060" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5059" xlink:to="Locator_us-gaap_FilmCostsAmortizedInNextOperatingCycle_5060" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5061" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PercentageOfUnamortizedFilmCosts" xlink:label="Locator_us-gaap_PercentageOfUnamortizedFilmCosts_5062" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5061" xlink:to="Locator_us-gaap_PercentageOfUnamortizedFilmCosts_5062" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5063" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FilmAndTelevisionLibraryCostsUnamortized" xlink:label="Locator_cmcsa_FilmAndTelevisionLibraryCostsUnamortized_5064" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5063" xlink:to="Locator_cmcsa_FilmAndTelevisionLibraryCostsUnamortized_5064" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5065" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_PercentageOfAcquiredFilmAndTelevisionLibrariesToBeAmortizedInNextThreeYears" xlink:label="Locator_cmcsa_PercentageOfAcquiredFilmAndTelevisionLibrariesToBeAmortizedInNextThreeYears_5066" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5065" xlink:to="Locator_cmcsa_PercentageOfAcquiredFilmAndTelevisionLibrariesToBeAmortizedInNextThreeYears_5066" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5049" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5050" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5049" xlink:to="Locator_us-gaap_StatementTable_5050" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureReceivablesMonetization">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5077" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5078" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5077" xlink:to="Locator_dei_LegalEntityAxis_5078" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5079" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5080" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5079" xlink:to="Locator_dei_EntityDomain_5080" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5081" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5082" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5081" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5082" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5083" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ReceivablesMonetizationTextBlock" xlink:label="Locator_cmcsa_ReceivablesMonetizationTextBlock_5084" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5083" xlink:to="Locator_cmcsa_ReceivablesMonetizationTextBlock_5084" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5085" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5086" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5085" xlink:to="Locator_us-gaap_StatementTable_5086" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureFilmAndTelevisionCostsFilmAndTelevisionCostsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5143" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FilmAndTelevisionCostsAxis" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsAxis_5144" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5143" xlink:to="Locator_cmcsa_FilmAndTelevisionCostsAxis_5144" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FilmAndTelevisionCostsAxis" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsAxis_5147" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FilmAndTelevisionCostsDomain" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsDomain_5148" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_FilmAndTelevisionCostsAxis_5147" xlink:to="Locator_cmcsa_FilmAndTelevisionCostsDomain_5148" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FilmAndTelevisionCostsAxis" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsAxis_5183" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FilmAndTelevisionCostsDomain" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsDomain_5184" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_cmcsa_FilmAndTelevisionCostsAxis_5183" xlink:to="Locator_cmcsa_FilmAndTelevisionCostsDomain_5184" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FilmAndTelevisionCostsDomain" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsDomain_5149" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FilmCostsMember" xlink:label="Locator_cmcsa_FilmCostsMember_5150" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FilmAndTelevisionCostsDomain_5149" xlink:to="Locator_cmcsa_FilmCostsMember_5150" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FilmAndTelevisionCostsDomain" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsDomain_5151" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TelevisionCostsMember" xlink:label="Locator_cmcsa_TelevisionCostsMember_5152" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FilmAndTelevisionCostsDomain_5151" xlink:to="Locator_cmcsa_TelevisionCostsMember_5152" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5145" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5146" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5145" xlink:to="Locator_dei_LegalEntityAxis_5146" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5153" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5154" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5153" xlink:to="Locator_dei_EntityDomain_5154" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5155" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5156" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5155" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5156" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FilmAndTelevisionCostsLineItems" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5109" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5110" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5109" xlink:to="Locator_us-gaap_StatementTable_5110" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FilmAndTelevisionCostsLineItems" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5157" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TheatricalFilmCostsAbstract" xlink:label="Locator_us-gaap_TheatricalFilmCostsAbstract_5158" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5157" xlink:to="Locator_us-gaap_TheatricalFilmCostsAbstract_5158" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TheatricalFilmCostsAbstract" xlink:label="Locator_us-gaap_TheatricalFilmCostsAbstract_5159" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TheatricalFilmCostsReleased" xlink:label="Locator_us-gaap_TheatricalFilmCostsReleased_5160" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_TheatricalFilmCostsAbstract_5159" xlink:to="Locator_us-gaap_TheatricalFilmCostsReleased_5160" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TheatricalFilmCostsAbstract" xlink:label="Locator_us-gaap_TheatricalFilmCostsAbstract_5161" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TheatricalFilmCostsCompletedAndNotReleased" xlink:label="Locator_us-gaap_TheatricalFilmCostsCompletedAndNotReleased_5162" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_TheatricalFilmCostsAbstract_5161" xlink:to="Locator_us-gaap_TheatricalFilmCostsCompletedAndNotReleased_5162" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TheatricalFilmCostsAbstract" xlink:label="Locator_us-gaap_TheatricalFilmCostsAbstract_5163" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TheatricalFilmCostsInProductionAndInDevelopment" xlink:label="Locator_cmcsa_TheatricalFilmCostsInProductionAndInDevelopment_5164" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_TheatricalFilmCostsAbstract_5163" xlink:to="Locator_cmcsa_TheatricalFilmCostsInProductionAndInDevelopment_5164" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TheatricalFilmCostsAbstract" xlink:label="Locator_us-gaap_TheatricalFilmCostsAbstract_5165" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TheatricalFilmCosts" xlink:label="Locator_us-gaap_TheatricalFilmCosts_5166" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_TheatricalFilmCostsAbstract_5165" xlink:to="Locator_us-gaap_TheatricalFilmCosts_5166" order="4.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FilmAndTelevisionCostsLineItems" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5167" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DirectToTelevisionFilmCostsAbstract" xlink:label="Locator_us-gaap_DirectToTelevisionFilmCostsAbstract_5168" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5167" xlink:to="Locator_us-gaap_DirectToTelevisionFilmCostsAbstract_5168" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DirectToTelevisionFilmCostsAbstract" xlink:label="Locator_us-gaap_DirectToTelevisionFilmCostsAbstract_5169" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DirectToTelevisionFilmCostsReleased" xlink:label="Locator_us-gaap_DirectToTelevisionFilmCostsReleased_5170" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DirectToTelevisionFilmCostsAbstract_5169" xlink:to="Locator_us-gaap_DirectToTelevisionFilmCostsReleased_5170" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DirectToTelevisionFilmCostsAbstract" xlink:label="Locator_us-gaap_DirectToTelevisionFilmCostsAbstract_5171" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DirectToTelevisionFilmCostsInProductionAndInDevelopment" xlink:label="Locator_cmcsa_DirectToTelevisionFilmCostsInProductionAndInDevelopment_5172" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DirectToTelevisionFilmCostsAbstract_5171" xlink:to="Locator_cmcsa_DirectToTelevisionFilmCostsInProductionAndInDevelopment_5172" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DirectToTelevisionFilmCostsAbstract" xlink:label="Locator_us-gaap_DirectToTelevisionFilmCostsAbstract_5173" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DirectToTelevisionFilmCosts" xlink:label="Locator_us-gaap_DirectToTelevisionFilmCosts_5174" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DirectToTelevisionFilmCostsAbstract_5173" xlink:to="Locator_us-gaap_DirectToTelevisionFilmCosts_5174" order="3.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FilmAndTelevisionCostsLineItems" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5175" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ProgrammingRightsLessAmortization" xlink:label="Locator_cmcsa_ProgrammingRightsLessAmortization_5176" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5175" xlink:to="Locator_cmcsa_ProgrammingRightsLessAmortization_5176" order="3.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FilmAndTelevisionCostsLineItems" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5177" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TotalFilmAndTelevisionCostsAndProgrammingRightsAfterAmortization" xlink:label="Locator_cmcsa_TotalFilmAndTelevisionCostsAndProgrammingRightsAfterAmortization_5178" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5177" xlink:to="Locator_cmcsa_TotalFilmAndTelevisionCostsAndProgrammingRightsAfterAmortization_5178" order="4.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FilmAndTelevisionCostsLineItems" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5179" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ProgrammingRightsCurrent" xlink:label="Locator_cmcsa_ProgrammingRightsCurrent_5180" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5179" xlink:to="Locator_cmcsa_ProgrammingRightsCurrent_5180" order="5.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FilmAndTelevisionCostsLineItems" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5181" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FilmAndTelevisionCosts" xlink:label="Locator_cmcsa_FilmAndTelevisionCosts_5182" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5181" xlink:to="Locator_cmcsa_FilmAndTelevisionCosts_5182" order="6.0" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureSupplementalFinancialInformationReceivablesDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5217" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5218" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5217" xlink:to="Locator_dei_LegalEntityAxis_5218" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5219" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5220" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5219" xlink:to="Locator_dei_EntityDomain_5220" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5221" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5222" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5221" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5222" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5223" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccountsReceivableGrossCurrent" xlink:label="Locator_us-gaap_AccountsReceivableGrossCurrent_5224" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5223" xlink:to="Locator_us-gaap_AccountsReceivableGrossCurrent_5224" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5225" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ReturnsAndIncentivesAllowance" xlink:label="Locator_cmcsa_ReturnsAndIncentivesAllowance_5226" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5225" xlink:to="Locator_cmcsa_ReturnsAndIncentivesAllowance_5226" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5227" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="Locator_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_5228" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5227" xlink:to="Locator_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_5228" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5229" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccountsReceivableNetNoncurrent" xlink:label="Locator_us-gaap_AccountsReceivableNetNoncurrent_5230" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5229" xlink:to="Locator_us-gaap_AccountsReceivableNetNoncurrent_5230" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5231" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="Locator_us-gaap_AccountsReceivableNetCurrent_5232" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5231" xlink:to="Locator_us-gaap_AccountsReceivableNetCurrent_5232" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5233" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5234" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5233" xlink:to="Locator_us-gaap_StatementTable_5234" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureSupplementalFinancialInformationNetCashProvidedByOperatingActivitiesDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5307" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5308" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5307" xlink:to="Locator_dei_LegalEntityAxis_5308" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5309" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5310" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5309" xlink:to="Locator_dei_EntityDomain_5310" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5311" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5312" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5311" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5312" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5315" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5316" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5315" xlink:to="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5316" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5317" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="Locator_us-gaap_DepreciationAndAmortization_5318" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5317" xlink:to="Locator_us-gaap_DepreciationAndAmortization_5318" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5319" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="Locator_us-gaap_ShareBasedCompensation_5320" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5319" xlink:to="Locator_us-gaap_ShareBasedCompensation_5320" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5321" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NoncashInterestExpenseIncomeNet" xlink:label="Locator_cmcsa_NoncashInterestExpenseIncomeNet_5322" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5321" xlink:to="Locator_cmcsa_NoncashInterestExpenseIncomeNet_5322" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5323" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="Locator_us-gaap_IncomeLossFromEquityMethodInvestments_5324" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5323" xlink:to="Locator_us-gaap_IncomeLossFromEquityMethodInvestments_5324" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5325" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvestmentDividendsOrDistributions" xlink:label="Locator_us-gaap_EquityMethodInvestmentDividendsOrDistributions_5326" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5325" xlink:to="Locator_us-gaap_EquityMethodInvestmentDividendsOrDistributions_5326" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5327" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_GainLossOnInvestmentsAndNoncashOtherIncomeExpenseNet" xlink:label="Locator_cmcsa_GainLossOnInvestmentsAndNoncashOtherIncomeExpenseNet_5328" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5327" xlink:to="Locator_cmcsa_GainLossOnInvestmentsAndNoncashOtherIncomeExpenseNet_5328" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5329" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="Locator_us-gaap_DeferredIncomeTaxExpenseBenefit_5330" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5329" xlink:to="Locator_us-gaap_DeferredIncomeTaxExpenseBenefit_5330" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5331" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5332" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5331" xlink:to="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5332" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5333" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ChangeInCurrentAndNoncurrentReceivablesNet" xlink:label="Locator_cmcsa_ChangeInCurrentAndNoncurrentReceivablesNet_5334" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5333" xlink:to="Locator_cmcsa_ChangeInCurrentAndNoncurrentReceivablesNet_5334" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5335" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Increasedecreaseinfilmandtelevisioncostnet" xlink:label="Locator_cmcsa_Increasedecreaseinfilmandtelevisioncostnet_5336" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5335" xlink:to="Locator_cmcsa_Increasedecreaseinfilmandtelevisioncostnet_5336" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5337" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="Locator_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_5338" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5337" xlink:to="Locator_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_5338" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5339" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_IncreaseDecreaseInAccruedParticipationsAndResidualsProgramObligationsAndDeferredRevenue" xlink:label="Locator_cmcsa_IncreaseDecreaseInAccruedParticipationsAndResidualsProgramObligationsAndDeferredRevenue_5340" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5339" xlink:to="Locator_cmcsa_IncreaseDecreaseInAccruedParticipationsAndResidualsProgramObligationsAndDeferredRevenue_5340" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5341" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet" xlink:label="Locator_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_5342" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5341" xlink:to="Locator_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_5342" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5343" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivities_5344" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5343" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivities_5344" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5313" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProfitLoss" xlink:label="Locator_us-gaap_ProfitLoss_5314" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5313" xlink:to="Locator_us-gaap_ProfitLoss_5314" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5249" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5250" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5249" xlink:to="Locator_us-gaap_StatementTable_5250" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureSupplementalFinancialInformationCashPaymentsForInterestAndIncomeTaxesDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5357" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5358" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5357" xlink:to="Locator_dei_LegalEntityAxis_5358" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5359" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5360" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5359" xlink:to="Locator_dei_EntityDomain_5360" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5361" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5362" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5361" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5362" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5363" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InterestPaidNet" xlink:label="Locator_us-gaap_InterestPaidNet_5364" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5363" xlink:to="Locator_us-gaap_InterestPaidNet_5364" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5365" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxesPaidNet" xlink:label="Locator_us-gaap_IncomeTaxesPaidNet_5366" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5365" xlink:to="Locator_us-gaap_IncomeTaxesPaidNet_5366" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5367" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5368" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5367" xlink:to="Locator_us-gaap_StatementTable_5368" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefitsComponentsOfBenefitsExpenseDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5393" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost" xlink:label="Locator_us-gaap_DefinedBenefitPlanServiceCost_5394" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5393" xlink:to="Locator_us-gaap_DefinedBenefitPlanServiceCost_5394" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5395" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost" xlink:label="Locator_us-gaap_DefinedBenefitPlanInterestCost_5396" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5395" xlink:to="Locator_us-gaap_DefinedBenefitPlanInterestCost_5396" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5397" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit" xlink:label="Locator_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_5398" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5397" xlink:to="Locator_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_5398" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5399" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanOtherCosts" xlink:label="Locator_us-gaap_DefinedBenefitPlanOtherCosts_5400" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5399" xlink:to="Locator_us-gaap_DefinedBenefitPlanOtherCosts_5400" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5401" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherPostretirementBenefitExpense" xlink:label="Locator_us-gaap_OtherPostretirementBenefitExpense_5402" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5401" xlink:to="Locator_us-gaap_OtherPostretirementBenefitExpense_5402" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5403" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PensionExpense" xlink:label="Locator_us-gaap_PensionExpense_5404" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5403" xlink:to="Locator_us-gaap_PensionExpense_5404" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5405" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PensionContributions" xlink:label="Locator_us-gaap_PensionContributions_5406" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5405" xlink:to="Locator_us-gaap_PensionContributions_5406" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5407" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5408" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5407" xlink:to="Locator_us-gaap_StatementTable_5408" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5409" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_5410" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5409" xlink:to="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_5410" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_5411" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_5412" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_5411" xlink:to="Locator_us-gaap_DefinedBenefitPlansDomain_5412" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_5413" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="Locator_us-gaap_PensionPlansDefinedBenefitMember_5414" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlansDomain_5413" xlink:to="Locator_us-gaap_PensionPlansDefinedBenefitMember_5414" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5415" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5416" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5415" xlink:to="Locator_dei_LegalEntityAxis_5416" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5417" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5418" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5417" xlink:to="Locator_dei_EntityDomain_5418" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5419" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5420" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5419" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5420" order="1.0" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefitsExpectedFutureBenefitPaymentsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5449" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5450" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5449" xlink:to="Locator_us-gaap_StatementTable_5450" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5451" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_5452" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5451" xlink:to="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_5452" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_5453" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_5454" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_5453" xlink:to="Locator_us-gaap_DefinedBenefitPlansDomain_5454" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_5455" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="Locator_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_5456" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlansDomain_5455" xlink:to="Locator_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_5456" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_5457" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="Locator_us-gaap_PensionPlansDefinedBenefitMember_5458" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlansDomain_5457" xlink:to="Locator_us-gaap_PensionPlansDefinedBenefitMember_5458" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5459" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5460" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5459" xlink:to="Locator_dei_LegalEntityAxis_5460" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5461" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5462" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5461" xlink:to="Locator_dei_EntityDomain_5462" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5463" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5464" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5463" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5464" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5465" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths" xlink:label="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_5466" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5465" xlink:to="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_5466" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5467" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo" xlink:label="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_5468" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5467" xlink:to="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_5468" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5469" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree" xlink:label="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_5470" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5469" xlink:to="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_5470" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5471" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour" xlink:label="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_5472" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5471" xlink:to="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_5472" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5473" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive" xlink:label="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_5474" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5473" xlink:to="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_5474" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5475" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter" xlink:label="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_5476" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5475" xlink:to="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_5476" order="6.0" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureScheduleIIValuationAndQualifyingAccountsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5507" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ValuationAllowancesAndReservesTypeAxis" xlink:label="Locator_us-gaap_ValuationAllowancesAndReservesTypeAxis_5508" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5507" xlink:to="Locator_us-gaap_ValuationAllowancesAndReservesTypeAxis_5508" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ValuationAllowancesAndReservesTypeAxis" xlink:label="Locator_us-gaap_ValuationAllowancesAndReservesTypeAxis_5511" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDomain" xlink:label="Locator_us-gaap_ValuationAllowancesAndReservesDomain_5512" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_ValuationAllowancesAndReservesTypeAxis_5511" xlink:to="Locator_us-gaap_ValuationAllowancesAndReservesDomain_5512" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ValuationAllowancesAndReservesTypeAxis" xlink:label="Locator_us-gaap_ValuationAllowancesAndReservesTypeAxis_5529" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDomain" xlink:label="Locator_us-gaap_ValuationAllowancesAndReservesDomain_5530" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_ValuationAllowancesAndReservesTypeAxis_5529" xlink:to="Locator_us-gaap_ValuationAllowancesAndReservesDomain_5530" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDomain" xlink:label="Locator_us-gaap_ValuationAllowancesAndReservesDomain_5513" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsMember" xlink:label="Locator_us-gaap_AllowanceForDoubtfulAccountsMember_5514" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ValuationAllowancesAndReservesDomain_5513" xlink:to="Locator_us-gaap_AllowanceForDoubtfulAccountsMember_5514" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDomain" xlink:label="Locator_us-gaap_ValuationAllowancesAndReservesDomain_5515" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AllowanceForSalesReturnsMember" xlink:label="Locator_us-gaap_AllowanceForSalesReturnsMember_5516" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ValuationAllowancesAndReservesDomain_5515" xlink:to="Locator_us-gaap_AllowanceForSalesReturnsMember_5516" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDomain" xlink:label="Locator_us-gaap_ValuationAllowancesAndReservesDomain_5517" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember" xlink:label="Locator_us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember_5518" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ValuationAllowancesAndReservesDomain_5517" xlink:to="Locator_us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember_5518" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5509" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5510" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5509" xlink:to="Locator_dei_LegalEntityAxis_5510" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5519" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5520" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5519" xlink:to="Locator_dei_EntityDomain_5520" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5521" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5522" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5521" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5522" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems" xlink:label="Locator_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_5503" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5504" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_5503" xlink:to="Locator_us-gaap_StatementTable_5504" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems" xlink:label="Locator_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_5523" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ValuationAllowancesAndReservesBalance" xlink:label="Locator_us-gaap_ValuationAllowancesAndReservesBalance_5524" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_5523" xlink:to="Locator_us-gaap_ValuationAllowancesAndReservesBalance_5524" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems" xlink:label="Locator_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_5525" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense" xlink:label="Locator_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_5526" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_5525" xlink:to="Locator_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_5526" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems" xlink:label="Locator_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_5527" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDeductions" xlink:label="Locator_us-gaap_ValuationAllowancesAndReservesDeductions_5528" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_5527" xlink:to="Locator_us-gaap_ValuationAllowancesAndReservesDeductions_5528" order="3.0" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureScheduleIIValuationAndQualifyingAccountsTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5551" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5552" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5551" xlink:to="Locator_dei_LegalEntityAxis_5552" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5553" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5554" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5553" xlink:to="Locator_dei_EntityDomain_5554" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5555" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5556" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5555" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5556" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5557" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ScheduleOfValuationAndQualifyingAccountsDisclosureTableTextBlock" xlink:label="Locator_cmcsa_ScheduleOfValuationAndQualifyingAccountsDisclosureTableTextBlock_5558" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5557" xlink:to="Locator_cmcsa_ScheduleOfValuationAndQualifyingAccountsDisclosureTableTextBlock_5558" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5559" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5560" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5559" xlink:to="Locator_us-gaap_StatementTable_5560" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureScheduleIIValuationAndQualifyingAccounts">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5573" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5574" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5573" xlink:to="Locator_dei_LegalEntityAxis_5574" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5575" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5576" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5575" xlink:to="Locator_dei_EntityDomain_5576" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5577" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5578" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5577" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5578" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5579" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock" xlink:label="Locator_us-gaap_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock_5580" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5579" xlink:to="Locator_us-gaap_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock_5580" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5581" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5582" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5581" xlink:to="Locator_us-gaap_StatementTable_5582" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/FairValueDisclosureNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5607" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueByLiabilityClassAxis" xlink:label="Locator_us-gaap_FairValueByLiabilityClassAxis_5608" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5607" xlink:to="Locator_us-gaap_FairValueByLiabilityClassAxis_5608" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueByLiabilityClassAxis" xlink:label="Locator_us-gaap_FairValueByLiabilityClassAxis_5611" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FairValueInputsLevel3Domain" xlink:label="Locator_cmcsa_FairValueInputsLevel3Domain_5612" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_FairValueByLiabilityClassAxis_5611" xlink:to="Locator_cmcsa_FairValueInputsLevel3Domain_5612" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueByLiabilityClassAxis" xlink:label="Locator_us-gaap_FairValueByLiabilityClassAxis_5641" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FairValueInputsLevel3Domain" xlink:label="Locator_cmcsa_FairValueInputsLevel3Domain_5642" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_FairValueByLiabilityClassAxis_5641" xlink:to="Locator_cmcsa_FairValueInputsLevel3Domain_5642" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FairValueInputsLevel3Domain" xlink:label="Locator_cmcsa_FairValueInputsLevel3Domain_5613" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ContingentConsiderationSettlementMember" xlink:label="Locator_cmcsa_ContingentConsiderationSettlementMember_5614" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FairValueInputsLevel3Domain_5613" xlink:to="Locator_cmcsa_ContingentConsiderationSettlementMember_5614" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FairValueInputsLevel3Domain" xlink:label="Locator_cmcsa_FairValueInputsLevel3Domain_5615" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MinimumMember" xlink:label="Locator_us-gaap_MinimumMember_5616" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FairValueInputsLevel3Domain_5615" xlink:to="Locator_us-gaap_MinimumMember_5616" order="2.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FairValueInputsLevel3Domain" xlink:label="Locator_cmcsa_FairValueInputsLevel3Domain_5617" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MaximumMember" xlink:label="Locator_us-gaap_MaximumMember_5618" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FairValueInputsLevel3Domain_5617" xlink:to="Locator_us-gaap_MaximumMember_5618" order="3.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FairValueInputsLevel3Domain" xlink:label="Locator_cmcsa_FairValueInputsLevel3Domain_5619" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ObligationsMember" xlink:label="Locator_us-gaap_ObligationsMember_5620" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FairValueInputsLevel3Domain_5619" xlink:to="Locator_us-gaap_ObligationsMember_5620" order="4.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FairValueInputsLevel3Domain" xlink:label="Locator_cmcsa_FairValueInputsLevel3Domain_5621" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FairValueOfSpecificContractObligationMember" xlink:label="Locator_cmcsa_FairValueOfSpecificContractObligationMember_5622" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FairValueInputsLevel3Domain_5621" xlink:to="Locator_cmcsa_FairValueOfSpecificContractObligationMember_5622" order="5.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FairValueInputsLevel3Domain" xlink:label="Locator_cmcsa_FairValueInputsLevel3Domain_5623" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ContractualObligationAndContingentConsiderationDiscountRatesMember" xlink:label="Locator_cmcsa_ContractualObligationAndContingentConsiderationDiscountRatesMember_5624" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FairValueInputsLevel3Domain_5623" xlink:to="Locator_cmcsa_ContractualObligationAndContingentConsiderationDiscountRatesMember_5624" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5609" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5610" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5609" xlink:to="Locator_dei_LegalEntityAxis_5610" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5625" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5626" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5625" xlink:to="Locator_dei_EntityDomain_5626" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5629" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NbcuniversalEnterpriseMember" xlink:label="Locator_cmcsa_NbcuniversalEnterpriseMember_5630" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5629" xlink:to="Locator_cmcsa_NbcuniversalEnterpriseMember_5630" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5627" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5628" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5627" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5628" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5631" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Contingentconsiderationamountofsettlementpayment" xlink:label="Locator_cmcsa_Contingentconsiderationamountofsettlementpayment_5632" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5631" xlink:to="Locator_cmcsa_Contingentconsiderationamountofsettlementpayment_5632" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5633" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Gainoncontingentconsiderationsettlement" xlink:label="Locator_cmcsa_Gainoncontingentconsiderationsettlement_5634" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5633" xlink:to="Locator_cmcsa_Gainoncontingentconsiderationsettlement_5634" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5635" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CarryingValueOfContractualObligation" xlink:label="Locator_cmcsa_CarryingValueOfContractualObligation_5636" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5635" xlink:to="Locator_cmcsa_CarryingValueOfContractualObligation_5636" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5637" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetImpairmentCharges" xlink:label="Locator_us-gaap_AssetImpairmentCharges_5638" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5637" xlink:to="Locator_us-gaap_AssetImpairmentCharges_5638" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5639" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FairValueAmountOfRedeemablePreferredShares" xlink:label="Locator_cmcsa_FairValueAmountOfRedeemablePreferredShares_5640" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5639" xlink:to="Locator_cmcsa_FairValueAmountOfRedeemablePreferredShares_5640" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5603" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5604" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5603" xlink:to="Locator_us-gaap_StatementTable_5604" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureSignificantTransactionsNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5729" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="Locator_us-gaap_BusinessAcquisitionAxis_5730" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5729" xlink:to="Locator_us-gaap_BusinessAcquisitionAxis_5730" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="Locator_us-gaap_BusinessAcquisitionAxis_5733" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5734" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_BusinessAcquisitionAxis_5733" xlink:to="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5734" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="Locator_us-gaap_BusinessAcquisitionAxis_5831" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5832" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_BusinessAcquisitionAxis_5831" xlink:to="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5832" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5735" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ComcastCorporationMember" xlink:label="Locator_cmcsa_ComcastCorporationMember_5736" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5735" xlink:to="Locator_cmcsa_ComcastCorporationMember_5736" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5737" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NbcuniversalMember" xlink:label="Locator_cmcsa_NbcuniversalMember_5738" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5737" xlink:to="Locator_cmcsa_NbcuniversalMember_5738" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5739" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashMember" xlink:label="Locator_us-gaap_CashMember_5740" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5739" xlink:to="Locator_us-gaap_CashMember_5740" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5741" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NbcuniversalcashonhandmemberMember" xlink:label="Locator_cmcsa_NbcuniversalcashonhandmemberMember_5742" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5741" xlink:to="Locator_cmcsa_NbcuniversalcashonhandmemberMember_5742" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5743" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="Locator_us-gaap_SeniorNotesMember_5744" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5743" xlink:to="Locator_us-gaap_SeniorNotesMember_5744" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5745" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommercialPaperMember" xlink:label="Locator_us-gaap_CommercialPaperMember_5746" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5745" xlink:to="Locator_us-gaap_CommercialPaperMember_5746" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5747" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="Locator_us-gaap_RevolvingCreditFacilityMember_5748" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5747" xlink:to="Locator_us-gaap_RevolvingCreditFacilityMember_5748" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5749" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PreferredStockMember" xlink:label="Locator_us-gaap_PreferredStockMember_5750" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5749" xlink:to="Locator_us-gaap_PreferredStockMember_5750" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5751" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalHoldingsPreferredStockMember" xlink:label="Locator_cmcsa_NBCUniversalHoldingsPreferredStockMember_5752" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5751" xlink:to="Locator_cmcsa_NBCUniversalHoldingsPreferredStockMember_5752" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5753" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NbcuniversalEnterpriseMember" xlink:label="Locator_cmcsa_NbcuniversalEnterpriseMember_5754" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5753" xlink:to="Locator_cmcsa_NbcuniversalEnterpriseMember_5754" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5755" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalTransactionMember" xlink:label="Locator_cmcsa_NBCUniversalTransactionMember_5756" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5755" xlink:to="Locator_cmcsa_NBCUniversalTransactionMember_5756" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5757" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ThemeParksSegmentMember" xlink:label="Locator_cmcsa_ThemeParksSegmentMember_5758" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5757" xlink:to="Locator_cmcsa_ThemeParksSegmentMember_5758" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5759" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_RedemptionTransactionMember" xlink:label="Locator_cmcsa_RedemptionTransactionMember_5760" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5759" xlink:to="Locator_cmcsa_RedemptionTransactionMember_5760" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5761" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TransactionRelatedExpensesMember" xlink:label="Locator_cmcsa_TransactionRelatedExpensesMember_5762" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5761" xlink:to="Locator_cmcsa_TransactionRelatedExpensesMember_5762" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5763" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DreamworksAnimationMember" xlink:label="Locator_cmcsa_DreamworksAnimationMember_5764" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5763" xlink:to="Locator_cmcsa_DreamworksAnimationMember_5764" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5767" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NbcuniversalEnterpriseCreditFacilityMember" xlink:label="Locator_cmcsa_NbcuniversalEnterpriseCreditFacilityMember_5768" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5767" xlink:to="Locator_cmcsa_NbcuniversalEnterpriseCreditFacilityMember_5768" order="17.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5769" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NbcuniversalRedemptionTransactionMember" xlink:label="Locator_cmcsa_NbcuniversalRedemptionTransactionMember_5770" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5769" xlink:to="Locator_cmcsa_NbcuniversalRedemptionTransactionMember_5770" order="18.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5765" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_UniversalStudiosJapanMember" xlink:label="Locator_cmcsa_UniversalStudiosJapanMember_5766" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_5765" xlink:to="Locator_cmcsa_UniversalStudiosJapanMember_5766" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5731" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5732" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5731" xlink:to="Locator_dei_LegalEntityAxis_5732" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5771" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5772" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5771" xlink:to="Locator_dei_EntityDomain_5772" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5773" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5774" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5773" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5774" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5725" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5726" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5725" xlink:to="Locator_us-gaap_StatementTable_5726" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5775" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ConsiderationTransferredToAcquireAdditionalInterestInSubsidiaries" xlink:label="Locator_cmcsa_ConsiderationTransferredToAcquireAdditionalInterestInSubsidiaries_5776" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5775" xlink:to="Locator_cmcsa_ConsiderationTransferredToAcquireAdditionalInterestInSubsidiaries_5776" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5777" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_PaymentsRelatedToAcquisitionOfBuildings" xlink:label="Locator_cmcsa_PaymentsRelatedToAcquisitionOfBuildings_5778" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5777" xlink:to="Locator_cmcsa_PaymentsRelatedToAcquisitionOfBuildings_5778" order="2.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5779" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ConsiderationTransferredRelatedToRedemptionTransactionByFundingSource" xlink:label="Locator_cmcsa_ConsiderationTransferredRelatedToRedemptionTransactionByFundingSource_5780" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5779" xlink:to="Locator_cmcsa_ConsiderationTransferredRelatedToRedemptionTransactionByFundingSource_5780" order="3.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5781" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_PortionOfConsiderationTransferredFundedByNbcuniversal" xlink:label="Locator_cmcsa_PortionOfConsiderationTransferredFundedByNbcuniversal_5782" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5781" xlink:to="Locator_cmcsa_PortionOfConsiderationTransferredFundedByNbcuniversal_5782" order="4.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5783" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PreferredStockDividendRatePercentage" xlink:label="Locator_us-gaap_PreferredStockDividendRatePercentage_5784" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5783" xlink:to="Locator_us-gaap_PreferredStockDividendRatePercentage_5784" order="5.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5785" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PreferredStockLiquidationPreferenceValue" xlink:label="Locator_us-gaap_PreferredStockLiquidationPreferenceValue_5786" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5785" xlink:to="Locator_us-gaap_PreferredStockLiquidationPreferenceValue_5786" order="6.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5787" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_PreferredStockDividendResetRatePercentage" xlink:label="Locator_cmcsa_PreferredStockDividendResetRatePercentage_5788" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5787" xlink:to="Locator_cmcsa_PreferredStockDividendResetRatePercentage_5788" order="7.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5789" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DeferredTaxLiabilitiesTransactionIncrease" xlink:label="Locator_cmcsa_DeferredTaxLiabilitiesTransactionIncrease_5790" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5789" xlink:to="Locator_cmcsa_DeferredTaxLiabilitiesTransactionIncrease_5790" order="8.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5791" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CashPaidToAcquireEntityIncludingTransactionRelatedCosts" xlink:label="Locator_cmcsa_CashPaidToAcquireEntityIncludingTransactionRelatedCosts_5792" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5791" xlink:to="Locator_cmcsa_CashPaidToAcquireEntityIncludingTransactionRelatedCosts_5792" order="9.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5793" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxesAssetLiabilityNet1" xlink:label="Locator_cmcsa_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxesAssetLiabilityNet1_5794" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5793" xlink:to="Locator_cmcsa_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxesAssetLiabilityNet1_5794" order="10.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5795" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NoncontrollingInterestAcquired" xlink:label="Locator_cmcsa_NoncontrollingInterestAcquired_5796" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5795" xlink:to="Locator_cmcsa_NoncontrollingInterestAcquired_5796" order="11.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5797" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_RedemptionPercentage" xlink:label="Locator_cmcsa_RedemptionPercentage_5798" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5797" xlink:to="Locator_cmcsa_RedemptionPercentage_5798" order="12.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5799" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_BusinessAcquisitionCostOfAcquiredEntityCashPaidNet1" xlink:label="Locator_cmcsa_BusinessAcquisitionCostOfAcquiredEntityCashPaidNet1_5800" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5799" xlink:to="Locator_cmcsa_BusinessAcquisitionCostOfAcquiredEntityCashPaidNet1_5800" order="13.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5801" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_BusinessAcquisitionCashAndCashEquivalents" xlink:label="Locator_cmcsa_BusinessAcquisitionCashAndCashEquivalents_5802" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5801" xlink:to="Locator_cmcsa_BusinessAcquisitionCashAndCashEquivalents_5802" order="14.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5803" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_GuaranteeObligationsCurrentPrincipalBalance" xlink:label="Locator_cmcsa_GuaranteeObligationsCurrentPrincipalBalance_5804" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5803" xlink:to="Locator_cmcsa_GuaranteeObligationsCurrentPrincipalBalance_5804" order="15.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5805" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_AcquireeStockholdersPercentageOwnershipInParentCompany" xlink:label="Locator_cmcsa_AcquireeStockholdersPercentageOwnershipInParentCompany_5806" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5805" xlink:to="Locator_cmcsa_AcquireeStockholdersPercentageOwnershipInParentCompany_5806" order="16.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5807" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NumberOfCustomers" xlink:label="Locator_cmcsa_NumberOfCustomers_5808" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5807" xlink:to="Locator_cmcsa_NumberOfCustomers_5808" order="17.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5809" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_MultipleValueOfExchangeAndSaleTransactions" xlink:label="Locator_cmcsa_MultipleValueOfExchangeAndSaleTransactions_5810" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5809" xlink:to="Locator_cmcsa_MultipleValueOfExchangeAndSaleTransactions_5810" order="18.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5811" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles" xlink:label="Locator_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_5812" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5811" xlink:to="Locator_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_5812" order="19.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5813" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Transactioncostsandtransactionrelatedcosts" xlink:label="Locator_cmcsa_Transactioncostsandtransactionrelatedcosts_5814" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5813" xlink:to="Locator_cmcsa_Transactioncostsandtransactionrelatedcosts_5814" order="20.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5815" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_WriteOffofassetsrelatedtomergeragreementtermination" xlink:label="Locator_cmcsa_WriteOffofassetsrelatedtomergeragreementtermination_5816" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5815" xlink:to="Locator_cmcsa_WriteOffofassetsrelatedtomergeragreementtermination_5816" order="21.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5817" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_OwnershipPercentageInNewCompany" xlink:label="Locator_cmcsa_OwnershipPercentageInNewCompany_5818" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5817" xlink:to="Locator_cmcsa_OwnershipPercentageInNewCompany_5818" order="22.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5819" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross" xlink:label="Locator_us-gaap_PaymentsToAcquireBusinessesGross_5820" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5819" xlink:to="Locator_us-gaap_PaymentsToAcquireBusinessesGross_5820" order="23.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5821" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners" xlink:label="Locator_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_5822" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5821" xlink:to="Locator_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_5822" order="24.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5823" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual" xlink:label="Locator_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_5824" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5823" xlink:to="Locator_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_5824" order="25.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5825" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual" xlink:label="Locator_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_5826" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5825" xlink:to="Locator_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_5826" order="26.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5827" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionSharePrice" xlink:label="Locator_us-gaap_BusinessAcquisitionSharePrice_5828" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5827" xlink:to="Locator_us-gaap_BusinessAcquisitionSharePrice_5828" order="27.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_5829" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Projectedpaymentstoacquirebusinesses" xlink:label="Locator_cmcsa_Projectedpaymentstoacquirebusinesses_5830" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_5829" xlink:to="Locator_cmcsa_Projectedpaymentstoacquirebusinesses_5830" order="28.0" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureGoodwillAndIntangibleAssetsIntangibleAssetsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5897" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5898" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5897" xlink:to="Locator_dei_EntityDomain_5898" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5899" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5900" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5899" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5900" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5889" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ScheduleOfIntangibleAssetsTable" xlink:label="Locator_cmcsa_ScheduleOfIntangibleAssetsTable_5890" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5889" xlink:to="Locator_cmcsa_ScheduleOfIntangibleAssetsTable_5890" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ScheduleOfIntangibleAssetsTable" xlink:label="Locator_cmcsa_ScheduleOfIntangibleAssetsTable_5893" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_IntangibleAssetsByMajorClassAxis" xlink:label="Locator_cmcsa_IntangibleAssetsByMajorClassAxis_5894" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_cmcsa_ScheduleOfIntangibleAssetsTable_5893" xlink:to="Locator_cmcsa_IntangibleAssetsByMajorClassAxis_5894" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_IntangibleAssetsByMajorClassAxis" xlink:label="Locator_cmcsa_IntangibleAssetsByMajorClassAxis_5901" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_IntangibleAssetsMajorClassNameDomain" xlink:label="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_5902" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_IntangibleAssetsByMajorClassAxis_5901" xlink:to="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_5902" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_IntangibleAssetsByMajorClassAxis" xlink:label="Locator_cmcsa_IntangibleAssetsByMajorClassAxis_5925" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_IntangibleAssetsMajorClassNameDomain" xlink:label="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_5926" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_cmcsa_IntangibleAssetsByMajorClassAxis_5925" xlink:to="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_5926" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_IntangibleAssetsMajorClassNameDomain" xlink:label="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_5903" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="Locator_us-gaap_CustomerRelationshipsMember_5904" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_5903" xlink:to="Locator_us-gaap_CustomerRelationshipsMember_5904" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_IntangibleAssetsMajorClassNameDomain" xlink:label="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_5905" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ComputerSoftwareIntangibleAssetMember" xlink:label="Locator_us-gaap_ComputerSoftwareIntangibleAssetMember_5906" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_5905" xlink:to="Locator_us-gaap_ComputerSoftwareIntangibleAssetMember_5906" order="2.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_IntangibleAssetsMajorClassNameDomain" xlink:label="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_5907" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherIntangibleAssetsMember" xlink:label="Locator_us-gaap_OtherIntangibleAssetsMember_5908" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_5907" xlink:to="Locator_us-gaap_OtherIntangibleAssetsMember_5908" order="3.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_IntangibleAssetsMajorClassNameDomain" xlink:label="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_5909" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TradeNamesMember" xlink:label="Locator_us-gaap_TradeNamesMember_5910" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_5909" xlink:to="Locator_us-gaap_TradeNamesMember_5910" order="4.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_IntangibleAssetsMajorClassNameDomain" xlink:label="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_5911" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LicensingAgreementsMember" xlink:label="Locator_us-gaap_LicensingAgreementsMember_5912" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_5911" xlink:to="Locator_us-gaap_LicensingAgreementsMember_5912" order="5.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_IntangibleAssetsMajorClassNameDomain" xlink:label="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_5913" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CableFranchiseRenewalCostsAndContractualOperatingRightsMember" xlink:label="Locator_cmcsa_CableFranchiseRenewalCostsAndContractualOperatingRightsMember_5914" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_5913" xlink:to="Locator_cmcsa_CableFranchiseRenewalCostsAndContractualOperatingRightsMember_5914" order="6.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_IntangibleAssetsMajorClassNameDomain" xlink:label="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_5915" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_PatentsAndOtherTechnologyRightsMember" xlink:label="Locator_cmcsa_PatentsAndOtherTechnologyRightsMember_5916" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_5915" xlink:to="Locator_cmcsa_PatentsAndOtherTechnologyRightsMember_5916" order="7.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ScheduleOfIntangibleAssetsTable" xlink:label="Locator_cmcsa_ScheduleOfIntangibleAssetsTable_5895" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5896" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_cmcsa_ScheduleOfIntangibleAssetsTable_5895" xlink:to="Locator_dei_LegalEntityAxis_5896" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5917" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill" xlink:label="Locator_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_5918" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5917" xlink:to="Locator_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_5918" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5919" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="Locator_us-gaap_FiniteLivedIntangibleAssetsGross_5920" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5919" xlink:to="Locator_us-gaap_FiniteLivedIntangibleAssetsGross_5920" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5921" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill" xlink:label="Locator_us-gaap_IntangibleAssetsGrossExcludingGoodwill_5922" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5921" xlink:to="Locator_us-gaap_IntangibleAssetsGrossExcludingGoodwill_5922" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5923" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife" xlink:label="Locator_us-gaap_FiniteLivedIntangibleAssetUsefulLife_5924" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5923" xlink:to="Locator_us-gaap_FiniteLivedIntangibleAssetUsefulLife_5924" order="4.0" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureSubsequentEvents">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5957" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5958" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5957" xlink:to="Locator_dei_LegalEntityAxis_5958" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5959" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5960" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5959" xlink:to="Locator_dei_EntityDomain_5960" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5961" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5962" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5961" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5962" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5963" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventsTextBlock" xlink:label="Locator_us-gaap_SubsequentEventsTextBlock_5964" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5963" xlink:to="Locator_us-gaap_SubsequentEventsTextBlock_5964" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5965" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5966" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5965" xlink:to="Locator_us-gaap_StatementTable_5966" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureRelatedPartyTransactionsNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5993" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_5994" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5993" xlink:to="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_5994" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_5997" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="Locator_us-gaap_RelatedPartyDomain_5998" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_5997" xlink:to="Locator_us-gaap_RelatedPartyDomain_5998" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6021" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="Locator_us-gaap_RelatedPartyDomain_6022" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6021" xlink:to="Locator_us-gaap_RelatedPartyDomain_6022" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="Locator_us-gaap_RelatedPartyDomain_5999" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalHoldingsPreferredStockMember" xlink:label="Locator_cmcsa_NBCUniversalHoldingsPreferredStockMember_6000" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_RelatedPartyDomain_5999" xlink:to="Locator_cmcsa_NBCUniversalHoldingsPreferredStockMember_6000" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="Locator_us-gaap_RelatedPartyDomain_6001" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CarryingValueOfRelatedPartyContractualObligationMember" xlink:label="Locator_cmcsa_CarryingValueOfRelatedPartyContractualObligationMember_6002" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_RelatedPartyDomain_6001" xlink:to="Locator_cmcsa_CarryingValueOfRelatedPartyContractualObligationMember_6002" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="Locator_us-gaap_RelatedPartyDomain_6003" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ComcastCorporationAndNBCUniversalMediaLLCRevolvingCreditAgreementMember" xlink:label="Locator_cmcsa_ComcastCorporationAndNBCUniversalMediaLLCRevolvingCreditAgreementMember_6004" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_RelatedPartyDomain_6003" xlink:to="Locator_cmcsa_ComcastCorporationAndNBCUniversalMediaLLCRevolvingCreditAgreementMember_6004" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5995" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5996" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5995" xlink:to="Locator_dei_LegalEntityAxis_5996" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6005" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6006" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6005" xlink:to="Locator_dei_EntityDomain_6006" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6007" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6008" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6007" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6008" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6009" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PreferredStockLiquidationPreferenceValue" xlink:label="Locator_us-gaap_PreferredStockLiquidationPreferenceValue_6010" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6009" xlink:to="Locator_us-gaap_PreferredStockLiquidationPreferenceValue_6010" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6011" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_RevolvingCreditAgreementCapacity" xlink:label="Locator_cmcsa_RevolvingCreditAgreementCapacity_6012" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6011" xlink:to="Locator_cmcsa_RevolvingCreditAgreementCapacity_6012" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6013" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PreferredStockDividendRatePercentage" xlink:label="Locator_us-gaap_PreferredStockDividendRatePercentage_6014" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6013" xlink:to="Locator_us-gaap_PreferredStockDividendRatePercentage_6014" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6015" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CollateralLiabilityForUnconsolidatedSubsidiaryDebt" xlink:label="Locator_cmcsa_CollateralLiabilityForUnconsolidatedSubsidiaryDebt_6016" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6015" xlink:to="Locator_cmcsa_CollateralLiabilityForUnconsolidatedSubsidiaryDebt_6016" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6017" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="Locator_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_6018" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6017" xlink:to="Locator_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_6018" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6019" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="Locator_us-gaap_OtherLiabilitiesNoncurrent_6020" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6019" xlink:to="Locator_us-gaap_OtherLiabilitiesNoncurrent_6020" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5989" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5990" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5989" xlink:to="Locator_us-gaap_StatementTable_5990" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/RelatedPartyTransactionsCondensedConsolidatedBalanceSheetDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6053" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6054" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6053" xlink:to="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6054" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6055" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="Locator_us-gaap_RelatedPartyDomain_6056" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6055" xlink:to="Locator_us-gaap_RelatedPartyDomain_6056" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="Locator_us-gaap_RelatedPartyDomain_6057" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ComcastAndConsolidatedSubsidiariesMember" xlink:label="Locator_cmcsa_ComcastAndConsolidatedSubsidiariesMember_6058" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_RelatedPartyDomain_6057" xlink:to="Locator_cmcsa_ComcastAndConsolidatedSubsidiariesMember_6058" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6059" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6060" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6059" xlink:to="Locator_dei_LegalEntityAxis_6060" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6061" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6062" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6061" xlink:to="Locator_dei_EntityDomain_6062" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6063" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6064" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6063" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6064" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6065" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="Locator_us-gaap_AccountsReceivableNetCurrent_6066" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6065" xlink:to="Locator_us-gaap_AccountsReceivableNetCurrent_6066" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6067" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NotesReceivableFromParent" xlink:label="Locator_cmcsa_NotesReceivableFromParent_6068" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6067" xlink:to="Locator_cmcsa_NotesReceivableFromParent_6068" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6069" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="Locator_us-gaap_AccountsPayableCurrent_6070" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6069" xlink:to="Locator_us-gaap_AccountsPayableCurrent_6070" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6071" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="Locator_us-gaap_AccruedLiabilitiesCurrent_6072" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6071" xlink:to="Locator_us-gaap_AccruedLiabilitiesCurrent_6072" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6073" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NotePayableToParent" xlink:label="Locator_cmcsa_NotePayableToParent_6074" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6073" xlink:to="Locator_cmcsa_NotePayableToParent_6074" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6075" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="Locator_us-gaap_OtherLiabilitiesNoncurrent_6076" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6075" xlink:to="Locator_us-gaap_OtherLiabilitiesNoncurrent_6076" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6077" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6078" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6077" xlink:to="Locator_us-gaap_StatementTable_6078" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/RelatedPartyTransactionsCondensedConsolidatedStatementOfIncomeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6101" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6102" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6101" xlink:to="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6102" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6103" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="Locator_us-gaap_RelatedPartyDomain_6104" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6103" xlink:to="Locator_us-gaap_RelatedPartyDomain_6104" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="Locator_us-gaap_RelatedPartyDomain_6105" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ComcastAndConsolidatedSubsidiariesMember" xlink:label="Locator_cmcsa_ComcastAndConsolidatedSubsidiariesMember_6106" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_RelatedPartyDomain_6105" xlink:to="Locator_cmcsa_ComcastAndConsolidatedSubsidiariesMember_6106" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6107" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6108" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6107" xlink:to="Locator_dei_LegalEntityAxis_6108" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6109" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6110" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6109" xlink:to="Locator_dei_EntityDomain_6110" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6111" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6112" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6111" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6112" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6113" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_OperatingExpensesExcludingDepreciationAndAmortization" xlink:label="Locator_cmcsa_OperatingExpensesExcludingDepreciationAndAmortization_6114" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6113" xlink:to="Locator_cmcsa_OperatingExpensesExcludingDepreciationAndAmortization_6114" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6115" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_OtherIncomeExpenseRelatedParty" xlink:label="Locator_cmcsa_OtherIncomeExpenseRelatedParty_6116" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6115" xlink:to="Locator_cmcsa_OtherIncomeExpenseRelatedParty_6116" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6117" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Revenues" xlink:label="Locator_us-gaap_Revenues_6118" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6117" xlink:to="Locator_us-gaap_Revenues_6118" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6119" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6120" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6119" xlink:to="Locator_us-gaap_StatementTable_6120" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureRelatedPartyTransactionsTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6139" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6140" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6139" xlink:to="Locator_dei_LegalEntityAxis_6140" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6141" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6142" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6141" xlink:to="Locator_dei_EntityDomain_6142" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6143" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6144" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6143" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6144" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6145" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock_6146" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6145" xlink:to="Locator_us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock_6146" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6147" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6148" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6147" xlink:to="Locator_us-gaap_StatementTable_6148" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureRelatedPartyTransactions">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6165" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6166" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6165" xlink:to="Locator_dei_LegalEntityAxis_6166" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6167" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6168" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6167" xlink:to="Locator_dei_EntityDomain_6168" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6169" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6170" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6169" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6170" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6171" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyTransactionsDisclosureTextBlock" xlink:label="Locator_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_6172" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6171" xlink:to="Locator_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_6172" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6161" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6162" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6161" xlink:to="Locator_us-gaap_StatementTable_6162" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureInvestmentsEquityMethodInvestmentsSummarizedFinancialInformationDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6201" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6202" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6201" xlink:to="Locator_dei_LegalEntityAxis_6202" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6203" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6204" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6203" xlink:to="Locator_dei_EntityDomain_6204" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6205" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6206" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6205" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6206" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6207" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets" xlink:label="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets_6208" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6207" xlink:to="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets_6208" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6209" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets" xlink:label="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets_6210" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6209" xlink:to="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets_6210" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6211" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities" xlink:label="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities_6212" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6211" xlink:to="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities_6212" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6213" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities" xlink:label="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities_6214" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6213" xlink:to="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities_6214" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6215" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvestmentSummarizedFinancialInformationMinorityInterest" xlink:label="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationMinorityInterest_6216" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6215" xlink:to="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationMinorityInterest_6216" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6217" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue" xlink:label="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue_6218" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6217" xlink:to="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue_6218" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6219" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_OperatingIncomeSummarizedFinancialInformation" xlink:label="Locator_cmcsa_OperatingIncomeSummarizedFinancialInformation_6220" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6219" xlink:to="Locator_cmcsa_OperatingIncomeSummarizedFinancialInformation_6220" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6221" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss" xlink:label="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss_6222" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6221" xlink:to="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss_6222" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6197" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6198" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6197" xlink:to="Locator_us-gaap_StatementTable_6198" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/CondensedConsolidatedStatementOfIncomeNBCUniversal">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6279" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6280" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6279" xlink:to="Locator_dei_LegalEntityAxis_6280" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6281" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6282" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6281" xlink:to="Locator_dei_EntityDomain_6282" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6283" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6284" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6283" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6284" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6285" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Revenues" xlink:label="Locator_us-gaap_Revenues_6286" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6285" xlink:to="Locator_us-gaap_Revenues_6286" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6287" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_6288" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6287" xlink:to="Locator_us-gaap_CostsAndExpensesAbstract_6288" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_6289" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ProgrammingAndProductionCosts" xlink:label="Locator_cmcsa_ProgrammingAndProductionCosts_6290" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_6289" xlink:to="Locator_cmcsa_ProgrammingAndProductionCosts_6290" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_6291" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_OtherOperatingAndAdministrative" xlink:label="Locator_cmcsa_OtherOperatingAndAdministrative_6292" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_6291" xlink:to="Locator_cmcsa_OtherOperatingAndAdministrative_6292" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_6293" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MarketingAndAdvertisingExpense" xlink:label="Locator_us-gaap_MarketingAndAdvertisingExpense_6294" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_6293" xlink:to="Locator_us-gaap_MarketingAndAdvertisingExpense_6294" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_6295" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Depreciation" xlink:label="Locator_us-gaap_Depreciation_6296" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_6295" xlink:to="Locator_us-gaap_Depreciation_6296" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_6297" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="Locator_us-gaap_AmortizationOfIntangibleAssets_6298" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_6297" xlink:to="Locator_us-gaap_AmortizationOfIntangibleAssets_6298" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_6299" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="Locator_us-gaap_CostsAndExpenses_6300" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_6299" xlink:to="Locator_us-gaap_CostsAndExpenses_6300" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6301" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="Locator_us-gaap_OperatingIncomeLoss_6302" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6301" xlink:to="Locator_us-gaap_OperatingIncomeLoss_6302" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6303" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6304" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6303" xlink:to="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6304" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6305" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InterestExpense" xlink:label="Locator_us-gaap_InterestExpense_6306" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6305" xlink:to="Locator_us-gaap_InterestExpense_6306" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6307" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentIncomeNonoperating" xlink:label="Locator_us-gaap_InvestmentIncomeNonoperating_6308" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6307" xlink:to="Locator_us-gaap_InvestmentIncomeNonoperating_6308" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6309" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="Locator_us-gaap_IncomeLossFromEquityMethodInvestments_6310" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6309" xlink:to="Locator_us-gaap_IncomeLossFromEquityMethodInvestments_6310" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6311" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="Locator_us-gaap_OtherNonoperatingIncomeExpense_6312" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6311" xlink:to="Locator_us-gaap_OtherNonoperatingIncomeExpense_6312" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6313" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="Locator_us-gaap_NonoperatingIncomeExpense_6314" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6313" xlink:to="Locator_us-gaap_NonoperatingIncomeExpense_6314" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6315" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="Locator_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_6316" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6315" xlink:to="Locator_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_6316" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6317" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="Locator_us-gaap_IncomeTaxExpenseBenefit_6318" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6317" xlink:to="Locator_us-gaap_IncomeTaxExpenseBenefit_6318" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6319" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProfitLoss" xlink:label="Locator_us-gaap_ProfitLoss_6320" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6319" xlink:to="Locator_us-gaap_ProfitLoss_6320" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6321" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="Locator_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_6322" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6321" xlink:to="Locator_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_6322" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6323" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="Locator_us-gaap_NetIncomeLoss_6324" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6323" xlink:to="Locator_us-gaap_NetIncomeLoss_6324" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6271" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6272" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6271" xlink:to="Locator_us-gaap_StatementTable_6272" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/SupplementalFinancialInformationComponentsOfAccumulatedOtherComprehensiveIncomeLossDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6351" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6352" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6351" xlink:to="Locator_dei_LegalEntityAxis_6352" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6353" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6354" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6353" xlink:to="Locator_dei_EntityDomain_6354" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6355" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6356" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6355" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6356" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6357" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax" xlink:label="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_6358" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6357" xlink:to="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_6358" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6359" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax" xlink:label="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax_6360" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6359" xlink:to="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax_6360" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6361" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax" xlink:label="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax_6362" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6361" xlink:to="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax_6362" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6363" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax" xlink:label="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax_6364" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6363" xlink:to="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax_6364" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6365" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_6366" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6365" xlink:to="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_6366" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6367" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6368" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6367" xlink:to="Locator_us-gaap_StatementTable_6368" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/LongTermDebtDebtBorrowingsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6389" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_6390" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6389" xlink:to="Locator_us-gaap_DebtInstrumentAxis_6390" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_6391" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6392" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_DebtInstrumentAxis_6391" xlink:to="Locator_us-gaap_DebtInstrumentNameDomain_6392" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6393" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Senior4600notesdue2045memberMember" xlink:label="Locator_cmcsa_Senior4600notesdue2045memberMember_6394" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6393" xlink:to="Locator_cmcsa_Senior4600notesdue2045memberMember_6394" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6395" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Senior3375NotesDue2025Member" xlink:label="Locator_cmcsa_Senior3375NotesDue2025Member_6396" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6395" xlink:to="Locator_cmcsa_Senior3375NotesDue2025Member_6396" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6397" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Senior460notesdue2046Member" xlink:label="Locator_cmcsa_Senior460notesdue2046Member_6398" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6397" xlink:to="Locator_cmcsa_Senior460notesdue2046Member_6398" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6399" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Senior4400notesdue2035memberMember" xlink:label="Locator_cmcsa_Senior4400notesdue2035memberMember_6400" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6399" xlink:to="Locator_cmcsa_Senior4400notesdue2035memberMember_6400" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6401" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_CurrentYearBorrowingsMember" xlink:label="Locator_cmcsa_CurrentYearBorrowingsMember_6402" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6401" xlink:to="Locator_cmcsa_CurrentYearBorrowingsMember_6402" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6403" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Senior275notesdue2023Member" xlink:label="Locator_cmcsa_Senior275notesdue2023Member_6404" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6403" xlink:to="Locator_cmcsa_Senior275notesdue2023Member_6404" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6405" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Senior315notesdue2026Member" xlink:label="Locator_cmcsa_Senior315notesdue2026Member_6406" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6405" xlink:to="Locator_cmcsa_Senior315notesdue2026Member_6406" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6407" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_MarchSenior275NotesDue2023Member" xlink:label="Locator_cmcsa_MarchSenior275NotesDue2023Member_6408" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6407" xlink:to="Locator_cmcsa_MarchSenior275NotesDue2023Member_6408" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6409" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_MarchSenior315notesDue2026Member" xlink:label="Locator_cmcsa_MarchSenior315notesDue2026Member_6410" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6409" xlink:to="Locator_cmcsa_MarchSenior315notesDue2026Member_6410" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6411" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Senior405NotesDue2046MemberMember" xlink:label="Locator_cmcsa_Senior405NotesDue2046MemberMember_6412" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6411" xlink:to="Locator_cmcsa_Senior405NotesDue2046MemberMember_6412" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6413" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Senior1625NotesDue2022Member" xlink:label="Locator_cmcsa_Senior1625NotesDue2022Member_6414" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6413" xlink:to="Locator_cmcsa_Senior1625NotesDue2022Member_6414" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6415" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Senior235NotesDue2027Member" xlink:label="Locator_cmcsa_Senior235NotesDue2027Member_6416" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6415" xlink:to="Locator_cmcsa_Senior235NotesDue2027Member_6416" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6417" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Senior320NotesDue2036Member" xlink:label="Locator_cmcsa_Senior320NotesDue2036Member_6418" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6417" xlink:to="Locator_cmcsa_Senior320NotesDue2036Member_6418" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6419" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Senior340NotesDue2046Member" xlink:label="Locator_cmcsa_Senior340NotesDue2046Member_6420" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6419" xlink:to="Locator_cmcsa_Senior340NotesDue2046Member_6420" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6421" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="Locator_us-gaap_DebtInstrumentFaceAmount_6422" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6421" xlink:to="Locator_us-gaap_DebtInstrumentFaceAmount_6422" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6425" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentMaturityDateDescription" xlink:label="Locator_us-gaap_DebtInstrumentMaturityDateDescription_6426" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6425" xlink:to="Locator_us-gaap_DebtInstrumentMaturityDateDescription_6426" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6423" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="Locator_us-gaap_DebtInstrumentInterestRateStatedPercentage_6424" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6423" xlink:to="Locator_us-gaap_DebtInstrumentInterestRateStatedPercentage_6424" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6385" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6386" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6385" xlink:to="Locator_us-gaap_StatementTable_6386" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/LongtermDebtDebtRepaymentsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6477" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6478" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6477" xlink:to="Locator_dei_LegalEntityAxis_6478" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6499" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6500" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6499" xlink:to="Locator_dei_EntityDomain_6500" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6501" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6502" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6501" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6502" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6475" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_6476" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6475" xlink:to="Locator_us-gaap_DebtInstrumentAxis_6476" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_6479" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6480" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_DebtInstrumentAxis_6479" xlink:to="Locator_us-gaap_DebtInstrumentNameDomain_6480" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6481" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Senior365NotesDue2015Member" xlink:label="Locator_cmcsa_Senior365NotesDue2015Member_6482" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6481" xlink:to="Locator_cmcsa_Senior365NotesDue2015Member_6482" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6483" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Senior590notesdue2016Member" xlink:label="Locator_cmcsa_Senior590notesdue2016Member_6484" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6483" xlink:to="Locator_cmcsa_Senior590notesdue2016Member_6484" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6485" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Senior650NotesDue2015Member" xlink:label="Locator_cmcsa_Senior650NotesDue2015Member_6486" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6485" xlink:to="Locator_cmcsa_Senior650NotesDue2015Member_6486" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6487" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Senior585notesdue2015Member" xlink:label="Locator_cmcsa_Senior585notesdue2015Member_6488" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6487" xlink:to="Locator_cmcsa_Senior585notesdue2015Member_6488" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6489" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Senior875NotesDue2015Member" xlink:label="Locator_cmcsa_Senior875NotesDue2015Member_6490" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6489" xlink:to="Locator_cmcsa_Senior875NotesDue2015Member_6490" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6491" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_OtherLongTermDebtMember" xlink:label="Locator_cmcsa_OtherLongTermDebtMember_6492" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6491" xlink:to="Locator_cmcsa_OtherLongTermDebtMember_6492" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6493" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Senior2875notesdueapril2016Member" xlink:label="Locator_cmcsa_Senior2875notesdueapril2016Member_6494" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6493" xlink:to="Locator_cmcsa_Senior2875notesdueapril2016Member_6494" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6495" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Senior495notesduejune2016Member" xlink:label="Locator_cmcsa_Senior495notesduejune2016Member_6496" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6495" xlink:to="Locator_cmcsa_Senior495notesduejune2016Member_6496" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6497" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NbcuniversalEnterpriseSeniorNotesDue2016Member" xlink:label="Locator_cmcsa_NbcuniversalEnterpriseSeniorNotesDue2016Member_6498" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6497" xlink:to="Locator_cmcsa_NbcuniversalEnterpriseSeniorNotesDue2016Member_6498" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6503" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RepaymentsOfOtherDebt" xlink:label="Locator_us-gaap_RepaymentsOfOtherDebt_6504" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6503" xlink:to="Locator_us-gaap_RepaymentsOfOtherDebt_6504" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6505" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EarlyRepaymentOfSeniorDebt" xlink:label="Locator_us-gaap_EarlyRepaymentOfSeniorDebt_6506" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6505" xlink:to="Locator_us-gaap_EarlyRepaymentOfSeniorDebt_6506" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6511" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_LossOnEarlyExtinguishmentOfDebt" xlink:label="Locator_cmcsa_LossOnEarlyExtinguishmentOfDebt_6512" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6511" xlink:to="Locator_cmcsa_LossOnEarlyExtinguishmentOfDebt_6512" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6509" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentMaturityDateDescription" xlink:label="Locator_us-gaap_DebtInstrumentMaturityDateDescription_6510" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6509" xlink:to="Locator_us-gaap_DebtInstrumentMaturityDateDescription_6510" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6507" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="Locator_us-gaap_DebtInstrumentInterestRateStatedPercentage_6508" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6507" xlink:to="Locator_us-gaap_DebtInstrumentInterestRateStatedPercentage_6508" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6471" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6472" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6471" xlink:to="Locator_us-gaap_StatementTable_6472" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/SignificantTransactionsPreliminaryAllocationOfPurchasePriceDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6577" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="Locator_us-gaap_BusinessAcquisitionAxis_6578" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6577" xlink:to="Locator_us-gaap_BusinessAcquisitionAxis_6578" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="Locator_us-gaap_BusinessAcquisitionAxis_6581" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6582" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_BusinessAcquisitionAxis_6581" xlink:to="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6582" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6587" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_UniversalStudiosJapanMember" xlink:label="Locator_cmcsa_UniversalStudiosJapanMember_6588" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6587" xlink:to="Locator_cmcsa_UniversalStudiosJapanMember_6588" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6579" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6580" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6579" xlink:to="Locator_dei_LegalEntityAxis_6580" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6583" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6584" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6583" xlink:to="Locator_dei_EntityDomain_6584" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6585" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6586" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6585" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6586" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6589" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" xlink:label="Locator_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_6590" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6589" xlink:to="Locator_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_6590" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6591" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill" xlink:label="Locator_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_6592" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6591" xlink:to="Locator_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_6592" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6593" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Businesscombinationpurchasepriceallocationworkingcapital" xlink:label="Locator_cmcsa_Businesscombinationpurchasepriceallocationworkingcapital_6594" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6593" xlink:to="Locator_cmcsa_Businesscombinationpurchasepriceallocationworkingcapital_6594" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6595" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt" xlink:label="Locator_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_6596" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6595" xlink:to="Locator_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_6596" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6597" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Businesscombinationpurchasepriceallocationothernoncurrentassetsandliabilities" xlink:label="Locator_cmcsa_Businesscombinationpurchasepriceallocationothernoncurrentassetsandliabilities_6598" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6597" xlink:to="Locator_cmcsa_Businesscombinationpurchasepriceallocationothernoncurrentassetsandliabilities_6598" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6599" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Businesscombinationrecognizedidentifiableassetsacquiredliabilitiesassumedandnciexclgoodwillnet" xlink:label="Locator_cmcsa_Businesscombinationrecognizedidentifiableassetsacquiredliabilitiesassumedandnciexclgoodwillnet_6600" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6599" xlink:to="Locator_cmcsa_Businesscombinationrecognizedidentifiableassetsacquiredliabilitiesassumedandnciexclgoodwillnet_6600" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6601" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue" xlink:label="Locator_us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue_6602" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6601" xlink:to="Locator_us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue_6602" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6603" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Goodwill" xlink:label="Locator_us-gaap_Goodwill_6604" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6603" xlink:to="Locator_us-gaap_Goodwill_6604" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6605" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="Locator_us-gaap_BusinessCombinationConsiderationTransferred1_6606" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6605" xlink:to="Locator_us-gaap_BusinessCombinationConsiderationTransferred1_6606" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6565" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6566" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6565" xlink:to="Locator_us-gaap_StatementTable_6566" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/RecentAccountingPronouncementsNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6635" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NewAccountingPronouncementEarlyAdoptionAxis" xlink:label="Locator_us-gaap_NewAccountingPronouncementEarlyAdoptionAxis_6636" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6635" xlink:to="Locator_us-gaap_NewAccountingPronouncementEarlyAdoptionAxis_6636" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NewAccountingPronouncementEarlyAdoptionAxis" xlink:label="Locator_us-gaap_NewAccountingPronouncementEarlyAdoptionAxis_6645" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NewAccountingPronouncementsEarlyAdoptionDomain" xlink:label="Locator_cmcsa_NewAccountingPronouncementsEarlyAdoptionDomain_6646" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_NewAccountingPronouncementEarlyAdoptionAxis_6645" xlink:to="Locator_cmcsa_NewAccountingPronouncementsEarlyAdoptionDomain_6646" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NewAccountingPronouncementEarlyAdoptionAxis" xlink:label="Locator_us-gaap_NewAccountingPronouncementEarlyAdoptionAxis_6661" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NewAccountingPronouncementsEarlyAdoptionDomain" xlink:label="Locator_cmcsa_NewAccountingPronouncementsEarlyAdoptionDomain_6662" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_NewAccountingPronouncementEarlyAdoptionAxis_6661" xlink:to="Locator_cmcsa_NewAccountingPronouncementsEarlyAdoptionDomain_6662" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NewAccountingPronouncementsEarlyAdoptionDomain" xlink:label="Locator_cmcsa_NewAccountingPronouncementsEarlyAdoptionDomain_6639" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DebtIssuanceCostsReclassificationMember" xlink:label="Locator_cmcsa_DebtIssuanceCostsReclassificationMember_6640" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_NewAccountingPronouncementsEarlyAdoptionDomain_6639" xlink:to="Locator_cmcsa_DebtIssuanceCostsReclassificationMember_6640" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NewAccountingPronouncementsEarlyAdoptionDomain" xlink:label="Locator_cmcsa_NewAccountingPronouncementsEarlyAdoptionDomain_6641" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_DeferredIncomeTaxesReclassificationMember" xlink:label="Locator_cmcsa_DeferredIncomeTaxesReclassificationMember_6642" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_NewAccountingPronouncementsEarlyAdoptionDomain_6641" xlink:to="Locator_cmcsa_DeferredIncomeTaxesReclassificationMember_6642" order="2.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NewAccountingPronouncementsEarlyAdoptionDomain" xlink:label="Locator_cmcsa_NewAccountingPronouncementsEarlyAdoptionDomain_6643" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ShareBasedCompensationNewAccountingPronouncementMember" xlink:label="Locator_cmcsa_ShareBasedCompensationNewAccountingPronouncementMember_6644" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_NewAccountingPronouncementsEarlyAdoptionDomain_6643" xlink:to="Locator_cmcsa_ShareBasedCompensationNewAccountingPronouncementMember_6644" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6637" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6638" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6637" xlink:to="Locator_dei_LegalEntityAxis_6638" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6647" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6648" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6647" xlink:to="Locator_dei_EntityDomain_6648" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6649" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6650" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6649" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6650" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6651" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NewAccountingPronouncementEffectiveAdoptionImpactOnBalanceSheet" xlink:label="Locator_cmcsa_NewAccountingPronouncementEffectiveAdoptionImpactOnBalanceSheet_6652" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6651" xlink:to="Locator_cmcsa_NewAccountingPronouncementEffectiveAdoptionImpactOnBalanceSheet_6652" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6653" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtIssuanceCosts" xlink:label="Locator_us-gaap_DebtIssuanceCosts_6654" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6653" xlink:to="Locator_us-gaap_DebtIssuanceCosts_6654" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6655" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NewAccountingPronouncementImpactOnBalanceSheetIfRetrospectivelyAdopted" xlink:label="Locator_cmcsa_NewAccountingPronouncementImpactOnBalanceSheetIfRetrospectivelyAdopted_6656" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6655" xlink:to="Locator_cmcsa_NewAccountingPronouncementImpactOnBalanceSheetIfRetrospectivelyAdopted_6656" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6657" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NewAccountingPronouncementImpactOnIncomeStatementIfAdopted" xlink:label="Locator_cmcsa_NewAccountingPronouncementImpactOnIncomeStatementIfAdopted_6658" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6657" xlink:to="Locator_cmcsa_NewAccountingPronouncementImpactOnIncomeStatementIfAdopted_6658" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6659" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NewAccountingPronouncementImpactOnStatementOfCashFlowIfAdopted" xlink:label="Locator_cmcsa_NewAccountingPronouncementImpactOnStatementOfCashFlowIfAdopted_6660" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6659" xlink:to="Locator_cmcsa_NewAccountingPronouncementImpactOnStatementOfCashFlowIfAdopted_6660" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6633" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6634" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6633" xlink:to="Locator_us-gaap_StatementTable_6634" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/SignificantTransactionsProFormaInformationDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6695" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="Locator_us-gaap_BusinessAcquisitionAxis_6696" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6695" xlink:to="Locator_us-gaap_BusinessAcquisitionAxis_6696" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="Locator_us-gaap_BusinessAcquisitionAxis_6699" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6700" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_BusinessAcquisitionAxis_6699" xlink:to="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6700" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6705" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_UniversalStudiosJapanMember" xlink:label="Locator_cmcsa_UniversalStudiosJapanMember_6706" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6705" xlink:to="Locator_cmcsa_UniversalStudiosJapanMember_6706" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6697" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6698" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6697" xlink:to="Locator_dei_LegalEntityAxis_6698" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6701" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6702" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6701" xlink:to="Locator_dei_EntityDomain_6702" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6703" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6704" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6703" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6704" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6707" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue" xlink:label="Locator_us-gaap_BusinessAcquisitionsProFormaRevenue_6708" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6707" xlink:to="Locator_us-gaap_BusinessAcquisitionsProFormaRevenue_6708" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6709" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss" xlink:label="Locator_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_6710" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6709" xlink:to="Locator_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_6710" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6711" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Businessacquisitionsproformaprofitlossattributatbletoparent1" xlink:label="Locator_cmcsa_Businessacquisitionsproformaprofitlossattributatbletoparent1_6712" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6711" xlink:to="Locator_cmcsa_Businessacquisitionsproformaprofitlossattributatbletoparent1_6712" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6713" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic" xlink:label="Locator_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_6714" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6713" xlink:to="Locator_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_6714" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6715" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted" xlink:label="Locator_us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_6716" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6715" xlink:to="Locator_us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_6716" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6693" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6694" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6693" xlink:to="Locator_us-gaap_StatementTable_6694" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/CondensedConsolidatedBalanceSheet">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6931" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="Locator_us-gaap_StatementClassOfStockAxis_6932" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6931" xlink:to="Locator_us-gaap_StatementClassOfStockAxis_6932" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="Locator_us-gaap_StatementClassOfStockAxis_6935" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_6936" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_StatementClassOfStockAxis_6935" xlink:to="Locator_us-gaap_ClassOfStockDomain_6936" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_6937" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="Locator_us-gaap_CommonClassAMember_6938" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_6937" xlink:to="Locator_us-gaap_CommonClassAMember_6938" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_6941" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ClassaSpecialCommonStockMember" xlink:label="Locator_cmcsa_ClassaSpecialCommonStockMember_6942" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_6941" xlink:to="Locator_cmcsa_ClassaSpecialCommonStockMember_6942" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_6939" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="Locator_us-gaap_CommonClassBMember_6940" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_6939" xlink:to="Locator_us-gaap_CommonClassBMember_6940" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6933" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6934" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6933" xlink:to="Locator_dei_LegalEntityAxis_6934" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6943" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6944" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6943" xlink:to="Locator_dei_EntityDomain_6944" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6945" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6946" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6945" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6946" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_6985" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="Locator_us-gaap_LiabilitiesCurrentAbstract_6986" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_6985" xlink:to="Locator_us-gaap_LiabilitiesCurrentAbstract_6986" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="Locator_us-gaap_LiabilitiesCurrentAbstract_6987" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="Locator_us-gaap_AccountsPayableCurrent_6988" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesCurrentAbstract_6987" xlink:to="Locator_us-gaap_AccountsPayableCurrent_6988" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="Locator_us-gaap_LiabilitiesCurrentAbstract_6989" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_AccruedParticipationsAndResidualsCurrent" xlink:label="Locator_cmcsa_AccruedParticipationsAndResidualsCurrent_6990" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesCurrentAbstract_6989" xlink:to="Locator_cmcsa_AccruedParticipationsAndResidualsCurrent_6990" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="Locator_us-gaap_LiabilitiesCurrentAbstract_6991" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccruedSalariesCurrent" xlink:label="Locator_us-gaap_AccruedSalariesCurrent_6992" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesCurrentAbstract_6991" xlink:to="Locator_us-gaap_AccruedSalariesCurrent_6992" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="Locator_us-gaap_LiabilitiesCurrentAbstract_6993" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProgramRightsObligationsCurrent" xlink:label="Locator_us-gaap_ProgramRightsObligationsCurrent_6994" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesCurrentAbstract_6993" xlink:to="Locator_us-gaap_ProgramRightsObligationsCurrent_6994" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="Locator_us-gaap_LiabilitiesCurrentAbstract_6995" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredRevenueCurrent" xlink:label="Locator_us-gaap_DeferredRevenueCurrent_6996" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesCurrentAbstract_6995" xlink:to="Locator_us-gaap_DeferredRevenueCurrent_6996" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="Locator_us-gaap_LiabilitiesCurrentAbstract_6997" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="Locator_us-gaap_AccruedLiabilitiesCurrent_6998" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesCurrentAbstract_6997" xlink:to="Locator_us-gaap_AccruedLiabilitiesCurrent_6998" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="Locator_us-gaap_LiabilitiesCurrentAbstract_6999" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NotePayableToParent" xlink:label="Locator_cmcsa_NotePayableToParent_7000" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesCurrentAbstract_6999" xlink:to="Locator_cmcsa_NotePayableToParent_7000" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="Locator_us-gaap_LiabilitiesCurrentAbstract_7001" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtCurrent" xlink:label="Locator_us-gaap_DebtCurrent_7002" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesCurrentAbstract_7001" xlink:to="Locator_us-gaap_DebtCurrent_7002" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="Locator_us-gaap_LiabilitiesCurrentAbstract_7003" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="Locator_us-gaap_LiabilitiesCurrent_7004" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesCurrentAbstract_7003" xlink:to="Locator_us-gaap_LiabilitiesCurrent_7004" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_7005" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations" xlink:label="Locator_us-gaap_LongTermDebtAndCapitalLeaseObligations_7006" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_7005" xlink:to="Locator_us-gaap_LongTermDebtAndCapitalLeaseObligations_7006" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_7007" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_AccruedParticipationsResidualsAndProgramObligationsNoncurrent" xlink:label="Locator_cmcsa_AccruedParticipationsResidualsAndProgramObligationsNoncurrent_7008" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_7007" xlink:to="Locator_cmcsa_AccruedParticipationsResidualsAndProgramObligationsNoncurrent_7008" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_7009" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxLiabilitiesNoncurrent" xlink:label="Locator_us-gaap_DeferredTaxLiabilitiesNoncurrent_7010" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_7009" xlink:to="Locator_us-gaap_DeferredTaxLiabilitiesNoncurrent_7010" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_7011" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredRevenueNoncurrent" xlink:label="Locator_us-gaap_DeferredRevenueNoncurrent_7012" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_7011" xlink:to="Locator_us-gaap_DeferredRevenueNoncurrent_7012" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_7013" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="Locator_us-gaap_OtherLiabilitiesNoncurrent_7014" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_7013" xlink:to="Locator_us-gaap_OtherLiabilitiesNoncurrent_7014" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_7015" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="Locator_us-gaap_CommitmentsAndContingencies_7016" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_7015" xlink:to="Locator_us-gaap_CommitmentsAndContingencies_7016" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_7017" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock" xlink:label="Locator_cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock_7018" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_7017" xlink:to="Locator_cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock_7018" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_7019" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount" xlink:label="Locator_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_7020" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_7019" xlink:to="Locator_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_7020" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_7021" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_TemporaryEquityCarryingAmountAttributableToRedeemableSubsidiaryPreferredStock" xlink:label="Locator_cmcsa_TemporaryEquityCarryingAmountAttributableToRedeemableSubsidiaryPreferredStock_7022" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_7021" xlink:to="Locator_cmcsa_TemporaryEquityCarryingAmountAttributableToRedeemableSubsidiaryPreferredStock_7022" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_7023" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7024" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_7023" xlink:to="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7024" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7025" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PreferredStockValue" xlink:label="Locator_us-gaap_PreferredStockValue_7026" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7025" xlink:to="Locator_us-gaap_PreferredStockValue_7026" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7027" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MembersCapital" xlink:label="Locator_us-gaap_MembersCapital_7028" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7027" xlink:to="Locator_us-gaap_MembersCapital_7028" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7029" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockValue" xlink:label="Locator_us-gaap_CommonStockValue_7030" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7029" xlink:to="Locator_us-gaap_CommonStockValue_7030" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7031" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="Locator_us-gaap_AdditionalPaidInCapital_7032" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7031" xlink:to="Locator_us-gaap_AdditionalPaidInCapital_7032" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7033" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="Locator_us-gaap_RetainedEarningsAccumulatedDeficit_7034" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7033" xlink:to="Locator_us-gaap_RetainedEarningsAccumulatedDeficit_7034" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7035" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TreasuryStockValue" xlink:label="Locator_us-gaap_TreasuryStockValue_7036" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7035" xlink:to="Locator_us-gaap_TreasuryStockValue_7036" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7037" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_7038" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7037" xlink:to="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_7038" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7039" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MembersEquity" xlink:label="Locator_us-gaap_MembersEquity_7040" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7039" xlink:to="Locator_us-gaap_MembersEquity_7040" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7041" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="Locator_us-gaap_StockholdersEquity_7042" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7041" xlink:to="Locator_us-gaap_StockholdersEquity_7042" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7043" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MinorityInterest" xlink:label="Locator_us-gaap_MinorityInterest_7044" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7043" xlink:to="Locator_us-gaap_MinorityInterest_7044" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7045" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MembersEquityAttributableToNoncontrollingInterest" xlink:label="Locator_us-gaap_MembersEquityAttributableToNoncontrollingInterest_7046" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7045" xlink:to="Locator_us-gaap_MembersEquityAttributableToNoncontrollingInterest_7046" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7047" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="Locator_us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest_7048" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7047" xlink:to="Locator_us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest_7048" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7049" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_7050" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_7049" xlink:to="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_7050" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_7051" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquity_7052" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_7051" xlink:to="Locator_us-gaap_LiabilitiesAndStockholdersEquity_7052" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6947" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="Locator_us-gaap_AssetsAbstract_6948" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6947" xlink:to="Locator_us-gaap_AssetsAbstract_6948" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="Locator_us-gaap_AssetsAbstract_6949" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_6950" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsAbstract_6949" xlink:to="Locator_us-gaap_AssetsCurrentAbstract_6950" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_6951" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="Locator_us-gaap_CashAndCashEquivalentsAtCarryingValue_6952" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_6951" xlink:to="Locator_us-gaap_CashAndCashEquivalentsAtCarryingValue_6952" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_6953" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="Locator_us-gaap_AccountsReceivableNetCurrent_6954" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_6953" xlink:to="Locator_us-gaap_AccountsReceivableNetCurrent_6954" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_6955" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ProgrammingRightsCurrent" xlink:label="Locator_cmcsa_ProgrammingRightsCurrent_6956" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_6955" xlink:to="Locator_cmcsa_ProgrammingRightsCurrent_6956" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_6957" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="Locator_us-gaap_OtherAssetsCurrent_6958" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_6957" xlink:to="Locator_us-gaap_OtherAssetsCurrent_6958" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_6959" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsNetCurrent" xlink:label="Locator_us-gaap_DeferredTaxAssetsNetCurrent_6960" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_6959" xlink:to="Locator_us-gaap_DeferredTaxAssetsNetCurrent_6960" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_6961" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="Locator_us-gaap_AssetsCurrent_6962" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_6961" xlink:to="Locator_us-gaap_AssetsCurrent_6962" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_6963" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_FilmAndTelevisionCosts" xlink:label="Locator_cmcsa_FilmAndTelevisionCosts_6964" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_6963" xlink:to="Locator_cmcsa_FilmAndTelevisionCosts_6964" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_6965" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Notesreceivablefromcomcast" xlink:label="Locator_cmcsa_Notesreceivablefromcomcast_6966" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_6965" xlink:to="Locator_cmcsa_Notesreceivablefromcomcast_6966" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_6967" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermInvestments" xlink:label="Locator_us-gaap_LongTermInvestments_6968" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_6967" xlink:to="Locator_us-gaap_LongTermInvestments_6968" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_6969" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentNet_6970" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_6969" xlink:to="Locator_us-gaap_PropertyPlantAndEquipmentNet_6970" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_6971" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IndefiniteLivedFranchiseRights" xlink:label="Locator_us-gaap_IndefiniteLivedFranchiseRights_6972" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_6971" xlink:to="Locator_us-gaap_IndefiniteLivedFranchiseRights_6972" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_6973" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Goodwill" xlink:label="Locator_us-gaap_Goodwill_6974" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_6973" xlink:to="Locator_us-gaap_Goodwill_6974" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_6975" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="Locator_us-gaap_IntangibleAssetsNetExcludingGoodwill_6976" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_6975" xlink:to="Locator_us-gaap_IntangibleAssetsNetExcludingGoodwill_6976" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_6977" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherIntangibleAssetsNet" xlink:label="Locator_us-gaap_OtherIntangibleAssetsNet_6978" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_6977" xlink:to="Locator_us-gaap_OtherIntangibleAssetsNet_6978" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_6979" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="Locator_us-gaap_OtherAssetsNoncurrent_6980" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_6979" xlink:to="Locator_us-gaap_OtherAssetsNoncurrent_6980" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_6981" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Assets" xlink:label="Locator_us-gaap_Assets_6982" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_6981" xlink:to="Locator_us-gaap_Assets_6982" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="Locator_us-gaap_AssetsAbstract_6983" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_6984" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsAbstract_6983" xlink:to="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_6984" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6735" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6736" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6735" xlink:to="Locator_us-gaap_StatementTable_6736" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DocumentAndEntityInformation">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_7105" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="Locator_us-gaap_StatementClassOfStockAxis_7106" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_7105" xlink:to="Locator_us-gaap_StatementClassOfStockAxis_7106" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="Locator_us-gaap_StatementClassOfStockAxis_7109" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_7110" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_StatementClassOfStockAxis_7109" xlink:to="Locator_us-gaap_ClassOfStockDomain_7110" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_7111" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="Locator_us-gaap_CommonClassAMember_7112" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_7111" xlink:to="Locator_us-gaap_CommonClassAMember_7112" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_7113" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ClassaSpecialCommonStockMember" xlink:label="Locator_cmcsa_ClassaSpecialCommonStockMember_7114" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_7113" xlink:to="Locator_cmcsa_ClassaSpecialCommonStockMember_7114" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_7115" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="Locator_us-gaap_CommonClassBMember_7116" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_7115" xlink:to="Locator_us-gaap_CommonClassBMember_7116" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_7107" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_7108" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_7107" xlink:to="Locator_dei_LegalEntityAxis_7108" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_7117" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_7118" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_7117" xlink:to="Locator_dei_EntityDomain_7118" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_7119" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ParentCompanyMember" xlink:label="Locator_us-gaap_ParentCompanyMember_7120" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_7119" xlink:to="Locator_us-gaap_ParentCompanyMember_7120" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_7121" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_7122" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_7121" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_7122" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7123" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentType" xlink:label="Locator_dei_DocumentType_7124" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_7123" xlink:to="Locator_dei_DocumentType_7124" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7125" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_AmendmentFlag" xlink:label="Locator_dei_AmendmentFlag_7126" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_7125" xlink:to="Locator_dei_AmendmentFlag_7126" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7127" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="Locator_dei_DocumentPeriodEndDate_7128" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_7127" xlink:to="Locator_dei_DocumentPeriodEndDate_7128" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7129" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="Locator_dei_DocumentFiscalYearFocus_7130" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_7129" xlink:to="Locator_dei_DocumentFiscalYearFocus_7130" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7131" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="Locator_dei_DocumentFiscalPeriodFocus_7132" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_7131" xlink:to="Locator_dei_DocumentFiscalPeriodFocus_7132" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7133" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_TradingSymbol" xlink:label="Locator_dei_TradingSymbol_7134" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_7133" xlink:to="Locator_dei_TradingSymbol_7134" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7135" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityRegistrantName" xlink:label="Locator_dei_EntityRegistrantName_7136" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_7135" xlink:to="Locator_dei_EntityRegistrantName_7136" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7137" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="Locator_dei_EntityCentralIndexKey_7138" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_7137" xlink:to="Locator_dei_EntityCentralIndexKey_7138" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7139" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="Locator_dei_CurrentFiscalYearEndDate_7140" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_7139" xlink:to="Locator_dei_CurrentFiscalYearEndDate_7140" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7141" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityFilerCategory" xlink:label="Locator_dei_EntityFilerCategory_7142" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_7141" xlink:to="Locator_dei_EntityFilerCategory_7142" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7143" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="Locator_dei_EntityCommonStockSharesOutstanding_7144" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_7143" xlink:to="Locator_dei_EntityCommonStockSharesOutstanding_7144" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7145" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityPublicFloat" xlink:label="Locator_dei_EntityPublicFloat_7146" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_7145" xlink:to="Locator_dei_EntityPublicFloat_7146" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7147" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityCurrentReportingStatus" xlink:label="Locator_dei_EntityCurrentReportingStatus_7148" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_7147" xlink:to="Locator_dei_EntityCurrentReportingStatus_7148" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7149" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityWellKnownSeasonedIssuer" xlink:label="Locator_dei_EntityWellKnownSeasonedIssuer_7150" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_7149" xlink:to="Locator_dei_EntityWellKnownSeasonedIssuer_7150" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7151" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityVoluntaryFilers" xlink:label="Locator_dei_EntityVoluntaryFilers_7152" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_7151" xlink:to="Locator_dei_EntityVoluntaryFilers_7152" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7103" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_7104" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_7103" xlink:to="Locator_us-gaap_StatementTable_7104" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/CondensedConsolidatingFinancialInformationNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_7185" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_7186" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_7185" xlink:to="Locator_us-gaap_DebtInstrumentAxis_7186" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_7203" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_7204" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_DebtInstrumentAxis_7203" xlink:to="Locator_us-gaap_DebtInstrumentNameDomain_7204" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_7205" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtMember" xlink:label="Locator_us-gaap_DebtMember_7206" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_7205" xlink:to="Locator_us-gaap_DebtMember_7206" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtMember" xlink:label="Locator_us-gaap_DebtMember_7187" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Comcastholdingszonesdueoctober2029Member" xlink:label="Locator_cmcsa_Comcastholdingszonesdueoctober2029Member_7188" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtMember_7187" xlink:to="Locator_cmcsa_Comcastholdingszonesdueoctober2029Member_7188" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtMember" xlink:label="Locator_us-gaap_DebtMember_7189" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Comcastholdingszonesduenovember2029Member" xlink:label="Locator_cmcsa_Comcastholdingszonesduenovember2029Member_7190" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtMember_7189" xlink:to="Locator_cmcsa_Comcastholdingszonesduenovember2029Member_7190" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtMember" xlink:label="Locator_us-gaap_DebtMember_7191" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GuarantorSubsidiariesMember" xlink:label="Locator_us-gaap_GuarantorSubsidiariesMember_7192" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtMember_7191" xlink:to="Locator_us-gaap_GuarantorSubsidiariesMember_7192" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtMember" xlink:label="Locator_us-gaap_DebtMember_7193" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_MaturinginnextfiveyearsMember" xlink:label="Locator_cmcsa_MaturinginnextfiveyearsMember_7194" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtMember_7193" xlink:to="Locator_cmcsa_MaturinginnextfiveyearsMember_7194" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtMember" xlink:label="Locator_us-gaap_DebtMember_7195" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="Locator_us-gaap_RevolvingCreditFacilityMember_7196" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtMember_7195" xlink:to="Locator_us-gaap_RevolvingCreditFacilityMember_7196" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtMember" xlink:label="Locator_us-gaap_DebtMember_7197" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_NbcuniversalEnterpriseMember" xlink:label="Locator_cmcsa_NbcuniversalEnterpriseMember_7198" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtMember_7197" xlink:to="Locator_cmcsa_NbcuniversalEnterpriseMember_7198" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtMember" xlink:label="Locator_us-gaap_DebtMember_7199" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="Locator_us-gaap_SeniorNotesMember_7200" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtMember_7199" xlink:to="Locator_us-gaap_SeniorNotesMember_7200" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtMember" xlink:label="Locator_us-gaap_DebtMember_7201" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_UniversalStudiosJapanTermLoansMember" xlink:label="Locator_cmcsa_UniversalStudiosJapanTermLoansMember_7202" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtMember_7201" xlink:to="Locator_cmcsa_UniversalStudiosJapanTermLoansMember_7202" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7207" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentMaturityDateDescription" xlink:label="Locator_us-gaap_DebtInstrumentMaturityDateDescription_7208" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_7207" xlink:to="Locator_us-gaap_DebtInstrumentMaturityDateDescription_7208" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7209" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_GuaranteeObligationsCurrentPrincipalBalance" xlink:label="Locator_cmcsa_GuaranteeObligationsCurrentPrincipalBalance_7210" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_7209" xlink:to="Locator_cmcsa_GuaranteeObligationsCurrentPrincipalBalance_7210" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7211" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="Locator_us-gaap_DebtInstrumentInterestRateStatedPercentage_7212" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_7211" xlink:to="Locator_us-gaap_DebtInstrumentInterestRateStatedPercentage_7212" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7213" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_Nonguaranteeobligationscurrentprincipalbalance" xlink:label="Locator_cmcsa_Nonguaranteeobligationscurrentprincipalbalance_7214" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_7213" xlink:to="Locator_cmcsa_Nonguaranteeobligationscurrentprincipalbalance_7214" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7183" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_7184" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_7183" xlink:to="Locator_us-gaap_StatementTable_7184" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/CommitmentsAndContingenciesInsuranceObligationsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_7249" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="Locator_us-gaap_SubsequentEventTypeAxis_7250" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_7249" xlink:to="Locator_us-gaap_SubsequentEventTypeAxis_7250" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="Locator_us-gaap_SubsequentEventTypeAxis_7251" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="Locator_us-gaap_SubsequentEventTypeDomain_7252" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_SubsequentEventTypeAxis_7251" xlink:to="Locator_us-gaap_SubsequentEventTypeDomain_7252" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="Locator_us-gaap_SubsequentEventTypeAxis_7261" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="Locator_us-gaap_SubsequentEventTypeDomain_7262" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_SubsequentEventTypeAxis_7261" xlink:to="Locator_us-gaap_SubsequentEventTypeDomain_7262" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="Locator_us-gaap_SubsequentEventTypeDomain_7253" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="Locator_us-gaap_SubsequentEventMember_7254" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SubsequentEventTypeDomain_7253" xlink:to="Locator_us-gaap_SubsequentEventMember_7254" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7245" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_7246" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_7245" xlink:to="Locator_us-gaap_StatementTable_7246" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7255" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_AmountPaidForTheSettlementOfAnEmployeeBenefitObligation" xlink:label="Locator_cmcsa_AmountPaidForTheSettlementOfAnEmployeeBenefitObligation_7256" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_7255" xlink:to="Locator_cmcsa_AmountPaidForTheSettlementOfAnEmployeeBenefitObligation_7256" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7257" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ExpenseRelatedToTheSettlementOfInsuranceObligations" xlink:label="Locator_cmcsa_ExpenseRelatedToTheSettlementOfInsuranceObligations_7258" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_7257" xlink:to="Locator_cmcsa_ExpenseRelatedToTheSettlementOfInsuranceObligations_7258" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_7259" />
        <loc xlink:type="locator" xlink:href="cmcsa-20160630.xsd#cmcsa_ReductionOfSplitDollarLifeInsuranceLiability" xlink:label="Locator_cmcsa_ReductionOfSplitDollarLifeInsuranceLiability_7260" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_7259" xlink:to="Locator_cmcsa_ReductionOfSplitDollarLifeInsuranceLiability_7260" order="3.0" />
    </definitionLink>
</linkbase>