<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <link:roleRef roleURI="http://www.unisys.com/role/AccountingStandards" xlink:href="uis-20190630.xsd#AccountingStandards" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/AccumulatedOtherComprehensiveIncome" xlink:href="uis-20190630.xsd#AccumulatedOtherComprehensiveIncome" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/AccumulatedOtherComprehensiveIncomeAmountsReclassifiedOutOfAccumulatedOtherComprehensiveIncomeDetail" xlink:href="uis-20190630.xsd#AccumulatedOtherComprehensiveIncomeAmountsReclassifiedOutOfAccumulatedOtherComprehensiveIncomeDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/AccumulatedOtherComprehensiveIncomeDetail" xlink:href="uis-20190630.xsd#AccumulatedOtherComprehensiveIncomeDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/AccumulatedOtherComprehensiveIncomeTables" xlink:href="uis-20190630.xsd#AccumulatedOtherComprehensiveIncomeTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/BasisOfPresentation" xlink:href="uis-20190630.xsd#BasisOfPresentation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/CapitalizedContractCosts" xlink:href="uis-20190630.xsd#CapitalizedContractCosts" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/CapitalizedContractCostsDetails" xlink:href="uis-20190630.xsd#CapitalizedContractCostsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/CapitalizedContractCostsTables" xlink:href="uis-20190630.xsd#CapitalizedContractCostsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/CommitmentsAndContingencies" xlink:href="uis-20190630.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/CommitmentsAndContingenciesAdditionalInformationDetail" xlink:href="uis-20190630.xsd#CommitmentsAndContingenciesAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/ConsolidatedBalanceSheetsUnaudited" xlink:href="uis-20190630.xsd#ConsolidatedBalanceSheetsUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical" xlink:href="uis-20190630.xsd#ConsolidatedBalanceSheetsUnauditedParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/ConsolidatedStatementsOfCashFlowsUnaudited" xlink:href="uis-20190630.xsd#ConsolidatedStatementsOfCashFlowsUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/ConsolidatedStatementsOfComprehensiveIncomeUnaudited" xlink:href="uis-20190630.xsd#ConsolidatedStatementsOfComprehensiveIncomeUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/ConsolidatedStatementsOfComprehensiveIncomeUnauditedParenthetical" xlink:href="uis-20190630.xsd#ConsolidatedStatementsOfComprehensiveIncomeUnauditedParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/ConsolidatedStatementsOfDeficitUnaudited" xlink:href="uis-20190630.xsd#ConsolidatedStatementsOfDeficitUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/ConsolidatedStatementsOfIncomeUnaudited" xlink:href="uis-20190630.xsd#ConsolidatedStatementsOfIncomeUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/ContractAssetsAndContractLiabilities" xlink:href="uis-20190630.xsd#ContractAssetsAndContractLiabilities" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/ContractAssetsAndContractLiabilitiesDetails" xlink:href="uis-20190630.xsd#ContractAssetsAndContractLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/ContractAssetsAndContractLiabilitiesTables" xlink:href="uis-20190630.xsd#ContractAssetsAndContractLiabilitiesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/CostReductionActions" xlink:href="uis-20190630.xsd#CostReductionActions" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/CostReductionActionsAdditionalInformationDetail" xlink:href="uis-20190630.xsd#CostReductionActionsAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/CostReductionActionsIndividualComponentsOfWorkForceReductionAndIdleLeaseCostDetail" xlink:href="uis-20190630.xsd#CostReductionActionsIndividualComponentsOfWorkForceReductionAndIdleLeaseCostDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/CostReductionActionsTables" xlink:href="uis-20190630.xsd#CostReductionActionsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/Debt" xlink:href="uis-20190630.xsd#Debt" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/DebtAdditionalInformationDetail" xlink:href="uis-20190630.xsd#DebtAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/DebtScheduleOfComponentsOfLongTermDebtDetails" xlink:href="uis-20190630.xsd#DebtScheduleOfComponentsOfLongTermDebtDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/DebtScheduleOfInterestExpenseDetails" xlink:href="uis-20190630.xsd#DebtScheduleOfInterestExpenseDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/DebtTables" xlink:href="uis-20190630.xsd#DebtTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/DocumentAndEntityInformation" xlink:href="uis-20190630.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/EarningsPerShare" xlink:href="uis-20190630.xsd#EarningsPerShare" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/EarningsPerShareComputationOfEarningsPerCommonShareAttributableToUnisysCorporationDetail" xlink:href="uis-20190630.xsd#EarningsPerShareComputationOfEarningsPerCommonShareAttributableToUnisysCorporationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/EarningsPerShareTables" xlink:href="uis-20190630.xsd#EarningsPerShareTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/FinancialInstrumentsAndFairValueMeasurements" xlink:href="uis-20190630.xsd#FinancialInstrumentsAndFairValueMeasurements" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/FinancialInstrumentsAndFairValueMeasurementsAdditionalInformationDetail" xlink:href="uis-20190630.xsd#FinancialInstrumentsAndFairValueMeasurementsAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/FinancialInstrumentsAndFairValueMeasurementsFairValueOfForeignExchangeForwardContractsByBalanceSheetLocationDetails" xlink:href="uis-20190630.xsd#FinancialInstrumentsAndFairValueMeasurementsFairValueOfForeignExchangeForwardContractsByBalanceSheetLocationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/FinancialInstrumentsAndFairValueMeasurementsFairValuesOfOtherFinancialInstrumentsNotMeasuredAtFairValueInConsolidatedBalanceSheetsDetails" xlink:href="uis-20190630.xsd#FinancialInstrumentsAndFairValueMeasurementsFairValuesOfOtherFinancialInstrumentsNotMeasuredAtFairValueInConsolidatedBalanceSheetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/FinancialInstrumentsAndFairValueMeasurementsGainsAndLossesRecognizedOnForeignExchangeForwardContractsDetails" xlink:href="uis-20190630.xsd#FinancialInstrumentsAndFairValueMeasurementsGainsAndLossesRecognizedOnForeignExchangeForwardContractsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/FinancialInstrumentsAndFairValueMeasurementsTables" xlink:href="uis-20190630.xsd#FinancialInstrumentsAndFairValueMeasurementsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/Goodwill" xlink:href="uis-20190630.xsd#Goodwill" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/GoodwillDetails" xlink:href="uis-20190630.xsd#GoodwillDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/GoodwillScheduleOfChangesInCarryingAmountOfGoodwillBySegmentDetails" xlink:href="uis-20190630.xsd#GoodwillScheduleOfChangesInCarryingAmountOfGoodwillBySegmentDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/GoodwillTables" xlink:href="uis-20190630.xsd#GoodwillTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/IncomeTaxes" xlink:href="uis-20190630.xsd#IncomeTaxes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/PensionAndPostretirementBenefits" xlink:href="uis-20190630.xsd#PensionAndPostretirementBenefits" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/PensionAndPostretirementBenefitsAdditionalInformationDetail" xlink:href="uis-20190630.xsd#PensionAndPostretirementBenefitsAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/PensionAndPostretirementBenefitsComponentsOfNetPeriodicBenefitExpenseDetail" xlink:href="uis-20190630.xsd#PensionAndPostretirementBenefitsComponentsOfNetPeriodicBenefitExpenseDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/PensionAndPostretirementBenefitsTables" xlink:href="uis-20190630.xsd#PensionAndPostretirementBenefitsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/Properties" xlink:href="uis-20190630.xsd#Properties" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/PropertiesDetails" xlink:href="uis-20190630.xsd#PropertiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/RemainingPerformanceObligations" xlink:href="uis-20190630.xsd#RemainingPerformanceObligations" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/RemainingPerformanceObligationsDetails" xlink:href="uis-20190630.xsd#RemainingPerformanceObligationsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/SegmentInformation" xlink:href="uis-20190630.xsd#SegmentInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/SegmentInformationAdditionalInformationDetail" xlink:href="uis-20190630.xsd#SegmentInformationAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/SegmentInformationCustomerRevenueByClassesOfSimilarProductsOrServicesDetail" xlink:href="uis-20190630.xsd#SegmentInformationCustomerRevenueByClassesOfSimilarProductsOrServicesDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/SegmentInformationReconciliationOfSegmentOperatingIncomeToConsolidatedIncomeLossBeforeIncomeTaxesDetail" xlink:href="uis-20190630.xsd#SegmentInformationReconciliationOfSegmentOperatingIncomeToConsolidatedIncomeLossBeforeIncomeTaxesDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/SegmentInformationRevenuePropertiesAndOutsourcingAssetsByGeographicSegmentDetail" xlink:href="uis-20190630.xsd#SegmentInformationRevenuePropertiesAndOutsourcingAssetsByGeographicSegmentDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/SegmentInformationSummaryOfOperationsBySegmentDetail" xlink:href="uis-20190630.xsd#SegmentInformationSummaryOfOperationsBySegmentDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/SegmentInformationTables" xlink:href="uis-20190630.xsd#SegmentInformationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/StockCompensation" xlink:href="uis-20190630.xsd#StockCompensation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/StockCompensationAdditionalInformationDetail" xlink:href="uis-20190630.xsd#StockCompensationAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/StockCompensationStockCompensationWeightedAverageAssumptionsDetails" xlink:href="uis-20190630.xsd#StockCompensationStockCompensationWeightedAverageAssumptionsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/StockCompensationSummaryOfRestrictedStockUnitActivityDetail" xlink:href="uis-20190630.xsd#StockCompensationSummaryOfRestrictedStockUnitActivityDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/StockCompensationTables" xlink:href="uis-20190630.xsd#StockCompensationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/SummaryOfSignificantAccountingPolicies" xlink:href="uis-20190630.xsd#SummaryOfSignificantAccountingPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetails" xlink:href="uis-20190630.xsd#SummaryOfSignificantAccountingPoliciesAdditionalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/SummaryOfSignificantAccountingPoliciesComponentsOfLeaseExpenseDetails" xlink:href="uis-20190630.xsd#SummaryOfSignificantAccountingPoliciesComponentsOfLeaseExpenseDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/SummaryOfSignificantAccountingPoliciesMarketableSoftwareDetails" xlink:href="uis-20190630.xsd#SummaryOfSignificantAccountingPoliciesMarketableSoftwareDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/SummaryOfSignificantAccountingPoliciesMaturitiesOfLeaseLiabilitiesTopic840Details" xlink:href="uis-20190630.xsd#SummaryOfSignificantAccountingPoliciesMaturitiesOfLeaseLiabilitiesTopic840Details" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/SummaryOfSignificantAccountingPoliciesMaturitiesOfLeaseLiabilitiesTopic842Details" xlink:href="uis-20190630.xsd#SummaryOfSignificantAccountingPoliciesMaturitiesOfLeaseLiabilitiesTopic842Details" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:href="uis-20190630.xsd#SummaryOfSignificantAccountingPoliciesPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/SummaryOfSignificantAccountingPoliciesReceivablesUnderSalesTypeLeaseDetails" xlink:href="uis-20190630.xsd#SummaryOfSignificantAccountingPoliciesReceivablesUnderSalesTypeLeaseDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/SummaryOfSignificantAccountingPoliciesSupplementalBalanceSheetInformationDetails" xlink:href="uis-20190630.xsd#SummaryOfSignificantAccountingPoliciesSupplementalBalanceSheetInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/SummaryOfSignificantAccountingPoliciesSupplementalCashFlowInformationDetails" xlink:href="uis-20190630.xsd#SummaryOfSignificantAccountingPoliciesSupplementalCashFlowInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/SummaryOfSignificantAccountingPoliciesTables" xlink:href="uis-20190630.xsd#SummaryOfSignificantAccountingPoliciesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/SupplementalCashFlowInformation" xlink:href="uis-20190630.xsd#SupplementalCashFlowInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/SupplementalCashFlowInformationReconciliationOfCashCashEquivalentsAndRestrictedCashDetails" xlink:href="uis-20190630.xsd#SupplementalCashFlowInformationReconciliationOfCashCashEquivalentsAndRestrictedCashDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/SupplementalCashFlowInformationScheduleOfSupplementalCashFlowInformationDetails" xlink:href="uis-20190630.xsd#SupplementalCashFlowInformationScheduleOfSupplementalCashFlowInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.unisys.com/role/SupplementalCashFlowInformationTables" xlink:href="uis-20190630.xsd#SupplementalCashFlowInformationTables" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" xlink:type="simple" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/AccountingStandards" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/AccumulatedOtherComprehensiveIncome" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/AccumulatedOtherComprehensiveIncomeAmountsReclassifiedOutOfAccumulatedOtherComprehensiveIncomeDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_D2BB8216481E67D409680E25B5AB08D0" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_755EE87D0164188DB81D0E25B5A86046" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_D2BB8216481E67D409680E25B5AB08D0" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_755EE87D0164188DB81D0E25B5A86046" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_4CD3A10D6DEA1B0889FB0E25B5A837C4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_755EE87D0164188DB81D0E25B5A86046" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_4CD3A10D6DEA1B0889FB0E25B5A837C4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_194AE231D1666BFEF46F0E25B5A99EA0_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_4CD3A10D6DEA1B0889FB0E25B5A837C4" xlink:to="loc_us-gaap_EquityComponentDomain_194AE231D1666BFEF46F0E25B5A99EA0_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_194AE231D1666BFEF46F0E25B5A99EA0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_4CD3A10D6DEA1B0889FB0E25B5A837C4" xlink:to="loc_us-gaap_EquityComponentDomain_194AE231D1666BFEF46F0E25B5A99EA0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_255F6ED7CD66105DACAD0E25B5A9ABE0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_194AE231D1666BFEF46F0E25B5A99EA0" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_255F6ED7CD66105DACAD0E25B5A9ABE0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember_0FB10E562368D2501B960E25B5A9CC30" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_255F6ED7CD66105DACAD0E25B5A9ABE0" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember_0FB10E562368D2501B960E25B5A9CC30" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember_4134375B2BF28F3EC1650E25B5A95009" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_255F6ED7CD66105DACAD0E25B5A9ABE0" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember_4134375B2BF28F3EC1650E25B5A95009" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresAbstract" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresAbstract_BBC29EA8BBD94A98ADB60E25B5ABE296" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_D2BB8216481E67D409680E25B5AB08D0" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresAbstract_BBC29EA8BBD94A98ADB60E25B5ABE296" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_F6176CDC0B294799B6C30E25B5ABFE2C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresAbstract_BBC29EA8BBD94A98ADB60E25B5ABE296" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_F6176CDC0B294799B6C30E25B5ABFE2C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReclassificationFromAociCurrentPeriodTax" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_14F224DCE2A575E8BF210E25B5AC1A5E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_D2BB8216481E67D409680E25B5AB08D0" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_14F224DCE2A575E8BF210E25B5AC1A5E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_498317BF12F5EFE575BF0E25B5AC70A8" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_D2BB8216481E67D409680E25B5AB08D0" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_498317BF12F5EFE575BF0E25B5AC70A8" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/AccumulatedOtherComprehensiveIncomeDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_915B7E6CE6B89C41E03E2CF687F16B5F" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_60A4681D1AB5FD03B2882CF687ED9E61" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_915B7E6CE6B89C41E03E2CF687F16B5F" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_60A4681D1AB5FD03B2882CF687ED9E61" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_F177D5D1D7A388D47C572CF687ED91BC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_60A4681D1AB5FD03B2882CF687ED9E61" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_F177D5D1D7A388D47C572CF687ED91BC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_30C6AC8A10D29171BCC92CF687ED3871_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_F177D5D1D7A388D47C572CF687ED91BC" xlink:to="loc_us-gaap_EquityComponentDomain_30C6AC8A10D29171BCC92CF687ED3871_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_30C6AC8A10D29171BCC92CF687ED3871" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_F177D5D1D7A388D47C572CF687ED91BC" xlink:to="loc_us-gaap_EquityComponentDomain_30C6AC8A10D29171BCC92CF687ED3871" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_88BF641342441C425CF32CF687ED4282" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_30C6AC8A10D29171BCC92CF687ED3871" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_88BF641342441C425CF32CF687ED4282" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedTranslationAdjustmentMember" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_7A9F88A6BD8014973A162CF687ED5663" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_88BF641342441C425CF32CF687ED4282" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_7A9F88A6BD8014973A162CF687ED5663" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_41F587C7099E1419617B2CF687F103E4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_88BF641342441C425CF32CF687ED4282" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_41F587C7099E1419617B2CF687F103E4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AOCIAttributableToParentNetOfTaxRollForward" xlink:label="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_D58689FFD95B4152E4552CF687F181AA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_915B7E6CE6B89C41E03E2CF687F16B5F" xlink:to="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_D58689FFD95B4152E4552CF687F181AA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_965C0FEBF68C7118FB022CF687F14E1F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_D58689FFD95B4152E4552CF687F181AA" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_965C0FEBF68C7118FB022CF687F14E1F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_D07D809E96B813A14DA52CF687F1140E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_D58689FFD95B4152E4552CF687F181AA" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_D07D809E96B813A14DA52CF687F1140E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_A664405A8E90B9BA36E72CF687F16532" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_D58689FFD95B4152E4552CF687F181AA" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_A664405A8E90B9BA36E72CF687F16532" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_B4F3D40D7DFF384461122CF687F18BA2" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_D58689FFD95B4152E4552CF687F181AA" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_B4F3D40D7DFF384461122CF687F18BA2" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/AccumulatedOtherComprehensiveIncomeTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/BasisOfPresentation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/CapitalizedContractCosts" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/CapitalizedContractCostsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostLineItems" xlink:label="loc_us-gaap_CapitalizedContractCostLineItems_F73ABFC4F2C91A71D2634B887ED26966" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostTable" xlink:label="loc_us-gaap_CapitalizedContractCostTable_3103500B9A09D75B65F64B887ED1D2FA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CapitalizedContractCostLineItems_F73ABFC4F2C91A71D2634B887ED26966" xlink:to="loc_us-gaap_CapitalizedContractCostTable_3103500B9A09D75B65F64B887ED1D2FA" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostAxis" xlink:label="loc_us-gaap_CapitalizedContractCostAxis_61D887A817A978C800144B887ED185B9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_CapitalizedContractCostTable_3103500B9A09D75B65F64B887ED1D2FA" xlink:to="loc_us-gaap_CapitalizedContractCostAxis_61D887A817A978C800144B887ED185B9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostDomain" xlink:label="loc_us-gaap_CapitalizedContractCostDomain_63AB083CACEDB3E28C0A4B887ED27239_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CapitalizedContractCostAxis_61D887A817A978C800144B887ED185B9" xlink:to="loc_us-gaap_CapitalizedContractCostDomain_63AB083CACEDB3E28C0A4B887ED27239_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostDomain" xlink:label="loc_us-gaap_CapitalizedContractCostDomain_63AB083CACEDB3E28C0A4B887ED27239" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CapitalizedContractCostAxis_61D887A817A978C800144B887ED185B9" xlink:to="loc_us-gaap_CapitalizedContractCostDomain_63AB083CACEDB3E28C0A4B887ED27239" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_SalesCommissionMember" xlink:label="loc_uis_SalesCommissionMember_485E4DE5EC38D0E74FD64B887ED21984" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostDomain_63AB083CACEDB3E28C0A4B887ED27239" xlink:to="loc_uis_SalesCommissionMember_485E4DE5EC38D0E74FD64B887ED21984" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostGross" xlink:label="loc_us-gaap_CapitalizedContractCostGross_633F912671AD652551F84B887ED2ADA6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostLineItems_F73ABFC4F2C91A71D2634B887ED26966" xlink:to="loc_us-gaap_CapitalizedContractCostGross_633F912671AD652551F84B887ED2ADA6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostAmortization" xlink:label="loc_us-gaap_CapitalizedContractCostAmortization_335C098AEA0ADE77ADB84B887ED3842D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostLineItems_F73ABFC4F2C91A71D2634B887ED26966" xlink:to="loc_us-gaap_CapitalizedContractCostAmortization_335C098AEA0ADE77ADB84B887ED3842D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostNet" xlink:label="loc_us-gaap_CapitalizedContractCostNet_47C961085AAB3F68B3394B887ED37C3E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostLineItems_F73ABFC4F2C91A71D2634B887ED26966" xlink:to="loc_us-gaap_CapitalizedContractCostNet_47C961085AAB3F68B3394B887ED37C3E" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/CapitalizedContractCostsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/CommitmentsAndContingencies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/CommitmentsAndContingenciesAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="loc_us-gaap_LossContingenciesLineItems_1E12CCB077435303F4E50E25B455CA1C" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LossContingenciesTable" xlink:label="loc_us-gaap_LossContingenciesTable_50C5D99A826EE093C7A70E25B4540056" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_1E12CCB077435303F4E50E25B455CA1C" xlink:to="loc_us-gaap_LossContingenciesTable_50C5D99A826EE093C7A70E25B4540056" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_AA95D5A8BD792F7E37AC0E25B454BE4B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_50C5D99A826EE093C7A70E25B4540056" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_AA95D5A8BD792F7E37AC0E25B454BE4B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="loc_us-gaap_LossContingencyNatureDomain_67F3FC16797952224E3F0E25B45430DE_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_AA95D5A8BD792F7E37AC0E25B454BE4B" xlink:to="loc_us-gaap_LossContingencyNatureDomain_67F3FC16797952224E3F0E25B45430DE_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="loc_us-gaap_LossContingencyNatureDomain_67F3FC16797952224E3F0E25B45430DE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_AA95D5A8BD792F7E37AC0E25B454BE4B" xlink:to="loc_us-gaap_LossContingencyNatureDomain_67F3FC16797952224E3F0E25B45430DE" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_MinistryOfJusticeOfBelgiumMember" xlink:label="loc_uis_MinistryOfJusticeOfBelgiumMember_79F551E0AA3990B0EDFD0E25B455D3DA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_67F3FC16797952224E3F0E25B45430DE" xlink:to="loc_uis_MinistryOfJusticeOfBelgiumMember_79F551E0AA3990B0EDFD0E25B455D3DA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InsuranceClaimsMember" xlink:label="loc_us-gaap_InsuranceClaimsMember_96BCF51452445447F2F20E25B455053A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_67F3FC16797952224E3F0E25B45430DE" xlink:to="loc_us-gaap_InsuranceClaimsMember_96BCF51452445447F2F20E25B455053A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LossContingencyDamagesSoughtValue" xlink:label="loc_us-gaap_LossContingencyDamagesSoughtValue_C45BB6F6E97D6A946A890E25B4559E64" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_1E12CCB077435303F4E50E25B455CA1C" xlink:to="loc_us-gaap_LossContingencyDamagesSoughtValue_C45BB6F6E97D6A946A890E25B4559E64" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_ContractTerminationCounterclaimsGovernmentsOtherThanUSFederalGovernment" xlink:label="loc_uis_ContractTerminationCounterclaimsGovernmentsOtherThanUSFederalGovernment_15AB7B7728806A5FC3170E25B45512D3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_1E12CCB077435303F4E50E25B455CA1C" xlink:to="loc_uis_ContractTerminationCounterclaimsGovernmentsOtherThanUSFederalGovernment_15AB7B7728806A5FC3170E25B45512D3" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_UnreservedTaxRelatedMattersInclusiveOfInterest" xlink:label="loc_uis_UnreservedTaxRelatedMattersInclusiveOfInterest_33CDC2F8CD0D232B7FCF0E25B4550E6A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_1E12CCB077435303F4E50E25B455CA1C" xlink:to="loc_uis_UnreservedTaxRelatedMattersInclusiveOfInterest_33CDC2F8CD0D232B7FCF0E25B4550E6A" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/ConsolidatedBalanceSheetsUnaudited" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/ConsolidatedStatementsOfCashFlowsUnaudited" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/ConsolidatedStatementsOfComprehensiveIncomeUnaudited" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/ConsolidatedStatementsOfComprehensiveIncomeUnauditedParenthetical" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/ConsolidatedStatementsOfDeficitUnaudited" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_D22A2F0F20FFB9CBB3E61A1FE9D87F3D" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_DABB30B5E7BB7E53ACB81A1FE9D5658C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_D22A2F0F20FFB9CBB3E61A1FE9D87F3D" xlink:to="loc_us-gaap_StatementTable_DABB30B5E7BB7E53ACB81A1FE9D5658C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_CC4094E81A01963296EA1A1FE9D5D60C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_DABB30B5E7BB7E53ACB81A1FE9D5658C" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_CC4094E81A01963296EA1A1FE9D5D60C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_9DBE26B43F003672B92F1A1FE9D6237E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_CC4094E81A01963296EA1A1FE9D5D60C" xlink:to="loc_us-gaap_EquityComponentDomain_9DBE26B43F003672B92F1A1FE9D6237E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_9DBE26B43F003672B92F1A1FE9D6237E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_CC4094E81A01963296EA1A1FE9D5D60C" xlink:to="loc_us-gaap_EquityComponentDomain_9DBE26B43F003672B92F1A1FE9D6237E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ParentMember" xlink:label="loc_us-gaap_ParentMember_05300F94BCB23EA2540D1A1FE9D6F266" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_9DBE26B43F003672B92F1A1FE9D6237E" xlink:to="loc_us-gaap_ParentMember_05300F94BCB23EA2540D1A1FE9D6F266" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_9B4E53DB171B9C8AD6781A1FE9D7C714" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_05300F94BCB23EA2540D1A1FE9D6F266" xlink:to="loc_us-gaap_CommonStockMember_9B4E53DB171B9C8AD6781A1FE9D7C714" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_C59CE3946A61B6C320981A1FE9D7660A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_05300F94BCB23EA2540D1A1FE9D6F266" xlink:to="loc_us-gaap_RetainedEarningsMember_C59CE3946A61B6C320981A1FE9D7660A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TreasuryStockMember" xlink:label="loc_us-gaap_TreasuryStockMember_79939C2742272F0126281A1FE9D73C45" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_05300F94BCB23EA2540D1A1FE9D6F266" xlink:to="loc_us-gaap_TreasuryStockMember_79939C2742272F0126281A1FE9D73C45" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_E34D68FAEFE740A162471A1FE9D798B5" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_05300F94BCB23EA2540D1A1FE9D6F266" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_E34D68FAEFE740A162471A1FE9D798B5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_6227F9C8551B37C265691A1FE9D7FDC4" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_05300F94BCB23EA2540D1A1FE9D6F266" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_6227F9C8551B37C265691A1FE9D7FDC4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NoncontrollingInterestMember" xlink:label="loc_us-gaap_NoncontrollingInterestMember_AC13A4424D6F1E56AD6C1A1FE9D79026" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_9DBE26B43F003672B92F1A1FE9D6237E" xlink:to="loc_us-gaap_NoncontrollingInterestMember_AC13A4424D6F1E56AD6C1A1FE9D79026" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_CC25072AEF5ECE4A81D61A1FE9D83000" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D22A2F0F20FFB9CBB3E61A1FE9D87F3D" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_CC25072AEF5ECE4A81D61A1FE9D83000" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_D4287A89EAF6317AC0571A1FE9D8DCA6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_CC25072AEF5ECE4A81D61A1FE9D83000" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_D4287A89EAF6317AC0571A1FE9D8DCA6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption" xlink:label="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_D7C60CF3D6E2C233A3D61A1FE9D8BE7F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_CC25072AEF5ECE4A81D61A1FE9D83000" xlink:to="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_D7C60CF3D6E2C233A3D61A1FE9D8BE7F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_547C35E88691237073611A1FE9D93716" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_CC25072AEF5ECE4A81D61A1FE9D83000" xlink:to="loc_us-gaap_ProfitLoss_547C35E88691237073611A1FE9D93716" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation" xlink:label="loc_us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_6F8205D8106B2ECD1CBE1A1FE9D907D8" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_CC25072AEF5ECE4A81D61A1FE9D83000" xlink:to="loc_us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_6F8205D8106B2ECD1CBE1A1FE9D907D8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_C8D80B3A153D45FA8A7E1A1FE9D94C67" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_CC25072AEF5ECE4A81D61A1FE9D83000" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_C8D80B3A153D45FA8A7E1A1FE9D94C67" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_2037375CD90C48BF5DAC1A1FE9D9FA87" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_CC25072AEF5ECE4A81D61A1FE9D83000" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_2037375CD90C48BF5DAC1A1FE9D9FA87" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/ConsolidatedStatementsOfIncomeUnaudited" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_A097E0F584B73BB078B00E2D26926CD8" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_1EB78B840AB58811AF590E2D26926236" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_A097E0F584B73BB078B00E2D26926CD8" xlink:to="loc_us-gaap_StatementTable_1EB78B840AB58811AF590E2D26926236" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_9C52E16BBE33BBC063510E2D2692F2B0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_1EB78B840AB58811AF590E2D26926236" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_9C52E16BBE33BBC063510E2D2692F2B0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_45F2DC69C96CA0CABC140E2D26921062_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_9C52E16BBE33BBC063510E2D2692F2B0" xlink:to="loc_us-gaap_SegmentDomain_45F2DC69C96CA0CABC140E2D26921062_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_45F2DC69C96CA0CABC140E2D26921062" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_9C52E16BBE33BBC063510E2D2692F2B0" xlink:to="loc_us-gaap_SegmentDomain_45F2DC69C96CA0CABC140E2D26921062" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_ServicesMember" xlink:label="loc_uis_ServicesMember_7739D3695DB29CA298780E2D2692E749" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_45F2DC69C96CA0CABC140E2D26921062" xlink:to="loc_uis_ServicesMember_7739D3695DB29CA298780E2D2692E749" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_TechnologyMember" xlink:label="loc_uis_TechnologyMember_B041308D607317C1E8BC0E2D2692B298" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_45F2DC69C96CA0CABC140E2D26921062" xlink:to="loc_uis_TechnologyMember_B041308D607317C1E8BC0E2D2692B298" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="loc_us-gaap_RevenuesAbstract_68946CFDFF6E06C493970E2D2692D165" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A097E0F584B73BB078B00E2D26926CD8" xlink:to="loc_us-gaap_RevenuesAbstract_68946CFDFF6E06C493970E2D2692D165" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_535CB84FEBDECEE1DA8C0E2D2692608B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_68946CFDFF6E06C493970E2D2692D165" xlink:to="loc_us-gaap_Revenues_535CB84FEBDECEE1DA8C0E2D2692608B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="loc_us-gaap_CostsAndExpensesAbstract_A57201D205F5DA85DB7D0E2D2692982B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A097E0F584B73BB078B00E2D26926CD8" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_A57201D205F5DA85DB7D0E2D2692982B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfRevenueAbstract" xlink:label="loc_us-gaap_CostOfRevenueAbstract_8C9E5C56ED60C78D65420E2D269273F7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_A57201D205F5DA85DB7D0E2D2692982B" xlink:to="loc_us-gaap_CostOfRevenueAbstract_8C9E5C56ED60C78D65420E2D269273F7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfRevenue" xlink:label="loc_us-gaap_CostOfRevenue_5CC703589D4D1135CCC10E2D26923424" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_8C9E5C56ED60C78D65420E2D269273F7" xlink:to="loc_us-gaap_CostOfRevenue_5CC703589D4D1135CCC10E2D26923424" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_F1CCD086E7A5546E71440E2D26922E17" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_A57201D205F5DA85DB7D0E2D2692982B" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_F1CCD086E7A5546E71440E2D26922E17" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_7186D579B1CF51CC7DD60E2D2692CCB7" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_A57201D205F5DA85DB7D0E2D2692982B" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_7186D579B1CF51CC7DD60E2D2692CCB7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="loc_us-gaap_CostsAndExpenses_5F905D2CBF503BFF14FE0E2D269293E9" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_A57201D205F5DA85DB7D0E2D2692982B" xlink:to="loc_us-gaap_CostsAndExpenses_5F905D2CBF503BFF14FE0E2D269293E9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_BC8159D6184E1CE312BA0E2D2692FE56" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A097E0F584B73BB078B00E2D26926CD8" xlink:to="loc_us-gaap_OperatingIncomeLoss_BC8159D6184E1CE312BA0E2D2692FE56" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_6CBE4F30973E0BAC243E0E2D26925651" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A097E0F584B73BB078B00E2D26926CD8" xlink:to="loc_us-gaap_InterestExpense_6CBE4F30973E0BAC243E0E2D26925651" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_1A61E80CAE43B6B93DDC0E2D2692A82D" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A097E0F584B73BB078B00E2D26926CD8" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_1A61E80CAE43B6B93DDC0E2D2692A82D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_60EF8D2091A15C50BAC30E2D26920C45" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A097E0F584B73BB078B00E2D26926CD8" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_60EF8D2091A15C50BAC30E2D26920C45" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_E49C481ADA32859F9F7D0E2D2692EF25" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A097E0F584B73BB078B00E2D26926CD8" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_E49C481ADA32859F9F7D0E2D2692EF25" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_A144697DC1B59EA83EE50E2D269290C4" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A097E0F584B73BB078B00E2D26926CD8" xlink:to="loc_us-gaap_ProfitLoss_A144697DC1B59EA83EE50E2D269290C4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity_1B143A0387CD36AE9D5A0E2D26929ED5" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A097E0F584B73BB078B00E2D26926CD8" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity_1B143A0387CD36AE9D5A0E2D26929ED5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_4A3CE6B6E90A044A56540E2D26920F1E" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A097E0F584B73BB078B00E2D26926CD8" xlink:to="loc_us-gaap_NetIncomeLoss_4A3CE6B6E90A044A56540E2D26920F1E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_814054FB210D2A1A3CA40E2D26926224" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A097E0F584B73BB078B00E2D26926CD8" xlink:to="loc_us-gaap_EarningsPerShareAbstract_814054FB210D2A1A3CA40E2D26926224" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_40DE23C5619C9B16B8940E2D2692D392" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_814054FB210D2A1A3CA40E2D26926224" xlink:to="loc_us-gaap_EarningsPerShareBasic_40DE23C5619C9B16B8940E2D2692D392" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_DE15D758913B0C367FCF0E2D2692103A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_814054FB210D2A1A3CA40E2D26926224" xlink:to="loc_us-gaap_EarningsPerShareDiluted_DE15D758913B0C367FCF0E2D2692103A" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/ContractAssetsAndContractLiabilities" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/ContractAssetsAndContractLiabilitiesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/ContractAssetsAndContractLiabilitiesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/CostReductionActions" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/CostReductionActionsAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_639F458F2E468AD8FC8CF609B3C6B89E" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_D045B68A1A5BE3519DB7F609B3C32AD7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_639F458F2E468AD8FC8CF609B3C6B89E" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_D045B68A1A5BE3519DB7F609B3C32AD7" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_1601A8427EBE3795A55DF609B3C33FA1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_D045B68A1A5BE3519DB7F609B3C32AD7" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_1601A8427EBE3795A55DF609B3C33FA1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_3FC1DCE31DD30F937C1FF609B3C48BC2_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_1601A8427EBE3795A55DF609B3C33FA1" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_3FC1DCE31DD30F937C1FF609B3C48BC2_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_3FC1DCE31DD30F937C1FF609B3C48BC2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_1601A8427EBE3795A55DF609B3C33FA1" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_3FC1DCE31DD30F937C1FF609B3C48BC2" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_LeaseAbandonmentandAssetWriteOffsMember" xlink:label="loc_uis_LeaseAbandonmentandAssetWriteOffsMember_B54CD035FC6353F7BCF8F609B3C4506A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_3FC1DCE31DD30F937C1FF609B3C48BC2" xlink:to="loc_uis_LeaseAbandonmentandAssetWriteOffsMember_B54CD035FC6353F7BCF8F609B3C4506A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_1DEF67DA1DA78B6EFB28F609B3C4FD24" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_D045B68A1A5BE3519DB7F609B3C32AD7" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_1DEF67DA1DA78B6EFB28F609B3C4FD24" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_9339E708A3241B5CFC50F609B3C46B08_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_1DEF67DA1DA78B6EFB28F609B3C4FD24" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_9339E708A3241B5CFC50F609B3C46B08_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_9339E708A3241B5CFC50F609B3C46B08" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_1DEF67DA1DA78B6EFB28F609B3C4FD24" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_9339E708A3241B5CFC50F609B3C46B08" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfSalesMember" xlink:label="loc_us-gaap_CostOfSalesMember_CE08B04A72C6E0BA1D83F609B3C502F1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_9339E708A3241B5CFC50F609B3C46B08" xlink:to="loc_us-gaap_CostOfSalesMember_CE08B04A72C6E0BA1D83F609B3C502F1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_2B75FAD33E248F163F38F609B3C53A47" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_9339E708A3241B5CFC50F609B3C46B08" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_2B75FAD33E248F163F38F609B3C53A47" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ResearchAndDevelopmentExpenseMember" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_6D57BC8C77335167EB97F609B3C5AC9A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_9339E708A3241B5CFC50F609B3C46B08" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_6D57BC8C77335167EB97F609B3C5AC9A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_A7AD9831D0553D5ED8B8F609B3C58E5D" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_D045B68A1A5BE3519DB7F609B3C32AD7" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_A7AD9831D0553D5ED8B8F609B3C58E5D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_2CA3C18219ADEAA276AFF609B3C6FD35_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_A7AD9831D0553D5ED8B8F609B3C58E5D" xlink:to="loc_us-gaap_SegmentDomain_2CA3C18219ADEAA276AFF609B3C6FD35_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_2CA3C18219ADEAA276AFF609B3C6FD35" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_A7AD9831D0553D5ED8B8F609B3C58E5D" xlink:to="loc_us-gaap_SegmentDomain_2CA3C18219ADEAA276AFF609B3C6FD35" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_ServicesMember" xlink:label="loc_uis_ServicesMember_5423941D84BD9BDABE89F609B3C6397E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_2CA3C18219ADEAA276AFF609B3C6FD35" xlink:to="loc_uis_ServicesMember_5423941D84BD9BDABE89F609B3C6397E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCharges" xlink:label="loc_us-gaap_RestructuringCharges_9565AE03191D7BF50230F609B3C6B05A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_639F458F2E468AD8FC8CF609B3C6B89E" xlink:to="loc_us-gaap_RestructuringCharges_9565AE03191D7BF50230F609B3C6B05A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherRestructuringCosts" xlink:label="loc_us-gaap_OtherRestructuringCosts_02EDB41A5537717A4E56F609B3C7CACC" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_639F458F2E468AD8FC8CF609B3C6B89E" xlink:to="loc_us-gaap_OtherRestructuringCosts_02EDB41A5537717A4E56F609B3C7CACC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SeveranceCosts1" xlink:label="loc_us-gaap_SeveranceCosts1_AC715F4391BADA587AE8F609B3C76C4D" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_639F458F2E468AD8FC8CF609B3C6B89E" xlink:to="loc_us-gaap_SeveranceCosts1_AC715F4391BADA587AE8F609B3C76C4D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringReserveAccrualAdjustment1" xlink:label="loc_us-gaap_RestructuringReserveAccrualAdjustment1_77D68F09E9B076CA1F93F609B3C7092C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_639F458F2E468AD8FC8CF609B3C6B89E" xlink:to="loc_us-gaap_RestructuringReserveAccrualAdjustment1_77D68F09E9B076CA1F93F609B3C7092C" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/CostReductionActionsIndividualComponentsOfWorkForceReductionAndIdleLeaseCostDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_655D3CBD60CF8E080E790E2D254DEF97" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_1966A5BBB4F24F0404FF0E2D25458838" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_655D3CBD60CF8E080E790E2D254DEF97" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_1966A5BBB4F24F0404FF0E2D25458838" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_0BE892AA4F79890513200E2D2545DA33" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_1966A5BBB4F24F0404FF0E2D25458838" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_0BE892AA4F79890513200E2D2545DA33" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_D17B80CB6E014160557F0E2D254C60FC_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_0BE892AA4F79890513200E2D2545DA33" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_D17B80CB6E014160557F0E2D254C60FC_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_D17B80CB6E014160557F0E2D254C60FC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_0BE892AA4F79890513200E2D2545DA33" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_D17B80CB6E014160557F0E2D254C60FC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeSeveranceMember" xlink:label="loc_us-gaap_EmployeeSeveranceMember_B55BFC52B20EC5076E540E2D254CBF1B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_D17B80CB6E014160557F0E2D254C60FC" xlink:to="loc_us-gaap_EmployeeSeveranceMember_B55BFC52B20EC5076E540E2D254CBF1B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementGeographicalAxis" xlink:label="loc_srt_StatementGeographicalAxis_5C5BD9844CEE8A64ECB10E2D254DA1BF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_1966A5BBB4F24F0404FF0E2D25458838" xlink:to="loc_srt_StatementGeographicalAxis_5C5BD9844CEE8A64ECB10E2D254DA1BF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_FED260C52966BC10E78A0E2D254DA378_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_5C5BD9844CEE8A64ECB10E2D254DA1BF" xlink:to="loc_srt_SegmentGeographicalDomain_FED260C52966BC10E78A0E2D254DA378_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_FED260C52966BC10E78A0E2D254DA378" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_5C5BD9844CEE8A64ECB10E2D254DA1BF" xlink:to="loc_srt_SegmentGeographicalDomain_FED260C52966BC10E78A0E2D254DA378" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_7671F3A0C2AB02C4BD960E2D254D7E76" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_FED260C52966BC10E78A0E2D254DA378" xlink:to="loc_country_US_7671F3A0C2AB02C4BD960E2D254D7E76" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NonUsMember" xlink:label="loc_us-gaap_NonUsMember_E1678BB5E42D201F7DC60E2D254DBDF7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_FED260C52966BC10E78A0E2D254DA378" xlink:to="loc_us-gaap_NonUsMember_E1678BB5E42D201F7DC60E2D254DBDF7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementScenarioAxis" xlink:label="loc_srt_StatementScenarioAxis_04349A564BE458DE2DEA0E2D254D9C96" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_1966A5BBB4F24F0404FF0E2D25458838" xlink:to="loc_srt_StatementScenarioAxis_04349A564BE458DE2DEA0E2D254D9C96" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srt_ScenarioUnspecifiedDomain_2B08722B5A606F5D92D10E2D254DA0D2_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_04349A564BE458DE2DEA0E2D254D9C96" xlink:to="loc_srt_ScenarioUnspecifiedDomain_2B08722B5A606F5D92D10E2D254DA0D2_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srt_ScenarioUnspecifiedDomain_2B08722B5A606F5D92D10E2D254DA0D2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_04349A564BE458DE2DEA0E2D254D9C96" xlink:to="loc_srt_ScenarioUnspecifiedDomain_2B08722B5A606F5D92D10E2D254DA0D2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioForecastMember" xlink:label="loc_srt_ScenarioForecastMember_BC8957E0CA256E24FE540E2D254D666C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_2B08722B5A606F5D92D10E2D254DA0D2" xlink:to="loc_srt_ScenarioForecastMember_BC8957E0CA256E24FE540E2D254D666C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringReserveRollForward" xlink:label="loc_us-gaap_RestructuringReserveRollForward_704F35AF6CB74C53F41A0E2D254D4B3B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_655D3CBD60CF8E080E790E2D254DEF97" xlink:to="loc_us-gaap_RestructuringReserveRollForward_704F35AF6CB74C53F41A0E2D254D4B3B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringReserve" xlink:label="loc_us-gaap_RestructuringReserve_9BD2CC45890CB390C4380E2D254D71EE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_704F35AF6CB74C53F41A0E2D254D4B3B" xlink:to="loc_us-gaap_RestructuringReserve_9BD2CC45890CB390C4380E2D254D71EE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsForRestructuring" xlink:label="loc_us-gaap_PaymentsForRestructuring_C7017682441168A94CE80E2D254D2142" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_704F35AF6CB74C53F41A0E2D254D4B3B" xlink:to="loc_us-gaap_PaymentsForRestructuring_C7017682441168A94CE80E2D254D2142" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringReserveAccrualAdjustment1" xlink:label="loc_us-gaap_RestructuringReserveAccrualAdjustment1_8F450AADD422822C16F40E2D254DC71E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_704F35AF6CB74C53F41A0E2D254D4B3B" xlink:to="loc_us-gaap_RestructuringReserveAccrualAdjustment1_8F450AADD422822C16F40E2D254DC71E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringReserveTranslationAdjustment" xlink:label="loc_us-gaap_RestructuringReserveTranslationAdjustment_9A1440D14E27331E2EF50E2D254D8DF3" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_704F35AF6CB74C53F41A0E2D254D4B3B" xlink:to="loc_us-gaap_RestructuringReserveTranslationAdjustment_9A1440D14E27331E2EF50E2D254D8DF3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_B37454AC1AFD8AF284820E2D254DA9A4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_655D3CBD60CF8E080E790E2D254DEF97" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_B37454AC1AFD8AF284820E2D254DA9A4" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/CostReductionActionsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/Debt" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/DebtAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_077708E3C4AC41BD12354B89CA411AFF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_us-gaap_DebtInstrumentTable_077708E3C4AC41BD12354B89CA411AFF" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_BDB8CC64BCFC83FACA404B89CA4142EA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_077708E3C4AC41BD12354B89CA411AFF" xlink:to="loc_us-gaap_DebtInstrumentAxis_BDB8CC64BCFC83FACA404B89CA4142EA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_791B46503EA616C0B5BB4B89CA427880_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_BDB8CC64BCFC83FACA404B89CA4142EA" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_791B46503EA616C0B5BB4B89CA427880_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_791B46503EA616C0B5BB4B89CA427880" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_BDB8CC64BCFC83FACA404B89CA4142EA" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_791B46503EA616C0B5BB4B89CA427880" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_SeniorSecuredNotesDue2022Member" xlink:label="loc_uis_SeniorSecuredNotesDue2022Member_3E7111A0F7A57B3A41844B89CA42F038" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_791B46503EA616C0B5BB4B89CA427880" xlink:to="loc_uis_SeniorSecuredNotesDue2022Member_3E7111A0F7A57B3A41844B89CA42F038" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_ConvertibleSeniorNotesDue2021Member" xlink:label="loc_uis_ConvertibleSeniorNotesDue2021Member_B359ED71B39BA703AD0B4B89CA42CDCB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_791B46503EA616C0B5BB4B89CA427880" xlink:to="loc_uis_ConvertibleSeniorNotesDue2021Member_B359ED71B39BA703AD0B4B89CA42CDCB" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_CreditAgreementMember" xlink:label="loc_uis_CreditAgreementMember_2015D3A4FE1F0A6C35514B89CA435112" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_791B46503EA616C0B5BB4B89CA427880" xlink:to="loc_uis_CreditAgreementMember_2015D3A4FE1F0A6C35514B89CA435112" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_InstallmentPaymentAgreementMember" xlink:label="loc_uis_InstallmentPaymentAgreementMember_442403C4EB396B9B05FE4B89CA43A4A5" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_791B46503EA616C0B5BB4B89CA427880" xlink:to="loc_uis_InstallmentPaymentAgreementMember_442403C4EB396B9B05FE4B89CA43A4A5" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_InstallmentPaymentAgreementMaturingMarch302022Member" xlink:label="loc_uis_InstallmentPaymentAgreementMaturingMarch302022Member_4D7261858C8BA792BB8C4B89CA43B931" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_uis_InstallmentPaymentAgreementMember_442403C4EB396B9B05FE4B89CA43A4A5" xlink:to="loc_uis_InstallmentPaymentAgreementMaturingMarch302022Member_4D7261858C8BA792BB8C4B89CA43B931" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_InstallmentPaymentAgreementMaturingDecember302023Member" xlink:label="loc_uis_InstallmentPaymentAgreementMaturingDecember302023Member_1CF9BBDBA853E65435764B89CA4359C5" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_uis_InstallmentPaymentAgreementMember_442403C4EB396B9B05FE4B89CA43A4A5" xlink:to="loc_uis_InstallmentPaymentAgreementMaturingDecember302023Member_1CF9BBDBA853E65435764B89CA4359C5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_3937427D6EA32FCBA8524B89CA43AEEF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_077708E3C4AC41BD12354B89CA411AFF" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_3937427D6EA32FCBA8524B89CA43AEEF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_9DCA7C6CFA5DAF98B97B4B89CA439FAD_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_3937427D6EA32FCBA8524B89CA43AEEF" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_9DCA7C6CFA5DAF98B97B4B89CA439FAD_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_9DCA7C6CFA5DAF98B97B4B89CA439FAD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_3937427D6EA32FCBA8524B89CA43AEEF" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_9DCA7C6CFA5DAF98B97B4B89CA439FAD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="loc_us-gaap_SeniorNotesMember_704DD5FE8CB1440215BF4B89CA449B0E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_9DCA7C6CFA5DAF98B97B4B89CA439FAD" xlink:to="loc_us-gaap_SeniorNotesMember_704DD5FE8CB1440215BF4B89CA449B0E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditMember" xlink:label="loc_us-gaap_LineOfCreditMember_3AFC257B9F388897959D4B89CA4434A1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_9DCA7C6CFA5DAF98B97B4B89CA439FAD" xlink:to="loc_us-gaap_LineOfCreditMember_3AFC257B9F388897959D4B89CA4434A1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_4968A4F23201D35CD14E4B89CA44FEE3" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_077708E3C4AC41BD12354B89CA411AFF" xlink:to="loc_us-gaap_CreditFacilityAxis_4968A4F23201D35CD14E4B89CA44FEE3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_94360A00452DBC5EEB464B89CA441623_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_4968A4F23201D35CD14E4B89CA44FEE3" xlink:to="loc_us-gaap_CreditFacilityDomain_94360A00452DBC5EEB464B89CA441623_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_94360A00452DBC5EEB464B89CA441623" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_4968A4F23201D35CD14E4B89CA44FEE3" xlink:to="loc_us-gaap_CreditFacilityDomain_94360A00452DBC5EEB464B89CA441623" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_FF116C509D61EE248AB84B89CA452CA1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_94360A00452DBC5EEB464B89CA441623" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_FF116C509D61EE248AB84B89CA452CA1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LetterOfCreditMember" xlink:label="loc_us-gaap_LetterOfCreditMember_FF939CF48C1022A30C244B89CA45969D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_94360A00452DBC5EEB464B89CA441623" xlink:to="loc_us-gaap_LetterOfCreditMember_FF939CF48C1022A30C244B89CA45969D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_43F1ECC94229CD0165914B89CA45265F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_43F1ECC94229CD0165914B89CA45265F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_ED2AF83E84AB7943C3B14B89CA46AB53" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_ED2AF83E84AB7943C3B14B89CA46AB53" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed_3F210EB1D926FD7FCA054B89CA4640E0" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed_3F210EB1D926FD7FCA054B89CA4640E0" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_DebtInstrumentRedemptionPercentageofNotes" xlink:label="loc_uis_DebtInstrumentRedemptionPercentageofNotes_508E83338D2421DE53B84B89CA46EADA" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_uis_DebtInstrumentRedemptionPercentageofNotes_508E83338D2421DE53B84B89CA46EADA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_1C72F57EB1B0055F66E64B89CA4688A1" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_1C72F57EB1B0055F66E64B89CA4688A1" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_DebtInstrumentCovenantRequiredCollateralCoverageRatioNotMetRedemptionPricePercentage" xlink:label="loc_uis_DebtInstrumentCovenantRequiredCollateralCoverageRatioNotMetRedemptionPricePercentage_23BD5B96F80A21B9EFCA4B89CA461FA9" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_uis_DebtInstrumentCovenantRequiredCollateralCoverageRatioNotMetRedemptionPricePercentage_23BD5B96F80A21B9EFCA4B89CA461FA9" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_DebtInstrumentCovenantCollateralCoverageRatioMinimum" xlink:label="loc_uis_DebtInstrumentCovenantCollateralCoverageRatioMinimum_5AFBDE54911F480128524B89CA46E919" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_uis_DebtInstrumentCovenantCollateralCoverageRatioMinimum_5AFBDE54911F480128524B89CA46E919" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_DebtInstrumentCovenantCollateralCoverageRatioCalculationAmountAddedtoCashandCashEquivalents" xlink:label="loc_uis_DebtInstrumentCovenantCollateralCoverageRatioCalculationAmountAddedtoCashandCashEquivalents_93D1FF6981028BF020854B89CA463EC5" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_uis_DebtInstrumentCovenantCollateralCoverageRatioCalculationAmountAddedtoCashandCashEquivalents_93D1FF6981028BF020854B89CA463EC5" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_DebtInstrumentCovenantCollateralCoverageRatioCalculationAverageGrantorEBITDAMultiplierforSevenMostRecentFiscalQuarters" xlink:label="loc_uis_DebtInstrumentCovenantCollateralCoverageRatioCalculationAverageGrantorEBITDAMultiplierforSevenMostRecentFiscalQuarters_0D1FC80CA295843A14794B89CA47B8E0" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_uis_DebtInstrumentCovenantCollateralCoverageRatioCalculationAverageGrantorEBITDAMultiplierforSevenMostRecentFiscalQuarters_0D1FC80CA295843A14794B89CA47B8E0" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_DebtInstrumentCovenantRequiredCollateralCoverageRatioNotMetRedemptionPeriod" xlink:label="loc_uis_DebtInstrumentCovenantRequiredCollateralCoverageRatioNotMetRedemptionPeriod_BA32D0772E07C7F6D53D4B89CA47448B" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_uis_DebtInstrumentCovenantRequiredCollateralCoverageRatioNotMetRedemptionPeriod_BA32D0772E07C7F6D53D4B89CA47448B" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_DebtInstrumentCovenantChangeinControlRedemptionPricePercentage" xlink:label="loc_uis_DebtInstrumentCovenantChangeinControlRedemptionPricePercentage_6C262F9612556236FA864B89CA472E5B" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_uis_DebtInstrumentCovenantChangeinControlRedemptionPricePercentage_6C262F9612556236FA864B89CA472E5B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_245B421CF22B03AAB69B4B89CA47A9D6" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_245B421CF22B03AAB69B4B89CA47A9D6" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_DebtInstrumentConvertibleConversionRate" xlink:label="loc_uis_DebtInstrumentConvertibleConversionRate_ACF1272ED02F2F85BBAB4B89CA47EF8E" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_uis_DebtInstrumentConvertibleConversionRate_ACF1272ED02F2F85BBAB4B89CA47EF8E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentConvertibleNumberOfEquityInstruments" xlink:label="loc_us-gaap_DebtInstrumentConvertibleNumberOfEquityInstruments_841566C0FF1AD646804C4B89CA489BF2" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_us-gaap_DebtInstrumentConvertibleNumberOfEquityInstruments_841566C0FF1AD646804C4B89CA489BF2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_6E288D24C521CD80F96C4B89CA4874EB" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_6E288D24C521CD80F96C4B89CA4874EB" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_PaymentsForCappedCallTransactions" xlink:label="loc_uis_PaymentsForCappedCallTransactions_13036EBB3E3506AD98AA4B89CA487935" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_uis_PaymentsForCappedCallTransactions_13036EBB3E3506AD98AA4B89CA487935" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_DebtInstrumentConversionPremium" xlink:label="loc_uis_DebtInstrumentConversionPremium_2815BFECEAB53AB491234B89CA48CD10" xlink:type="locator" />
    <link:definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_uis_DebtInstrumentConversionPremium_2815BFECEAB53AB491234B89CA48CD10" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_7B2BDA4C1F7F19911EC24B89CA482E1D" xlink:type="locator" />
    <link:definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_7B2BDA4C1F7F19911EC24B89CA482E1D" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_LineofCreditFacilityAccordionFeatureIncreaseLimit" xlink:label="loc_uis_LineofCreditFacilityAccordionFeatureIncreaseLimit_FE9FA5A6D6505B21D6DC4B89CA484B69" xlink:type="locator" />
    <link:definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_uis_LineofCreditFacilityAccordionFeatureIncreaseLimit_FE9FA5A6D6505B21D6DC4B89CA484B69" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCredit" xlink:label="loc_us-gaap_LineOfCredit_E4858B11EF643A3EF7A94B89CA488D67" xlink:type="locator" />
    <link:definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_us-gaap_LineOfCredit_E4858B11EF643A3EF7A94B89CA488D67" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_C27BC405445759F57B334B89CA492064" xlink:type="locator" />
    <link:definitionArc order="21" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_C27BC405445759F57B334B89CA492064" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_1519F6C285206AC0B2754B89CA4934A6" xlink:type="locator" />
    <link:definitionArc order="22" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_1519F6C285206AC0B2754B89CA4934A6" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_LineofCreditFacilitySpringingMaturityDatePeriodPriortoMaturityDateofConvertibleDebt" xlink:label="loc_uis_LineofCreditFacilitySpringingMaturityDatePeriodPriortoMaturityDateofConvertibleDebt_141CEFC1913CA00A5C994B89CA496308" xlink:type="locator" />
    <link:definitionArc order="23" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_uis_LineofCreditFacilitySpringingMaturityDatePeriodPriortoMaturityDateofConvertibleDebt_141CEFC1913CA00A5C994B89CA496308" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_LineofCreditFacilitySpringingMaturityDatePeriodPriortoMaturityDateofSecuredDebt" xlink:label="loc_uis_LineofCreditFacilitySpringingMaturityDatePeriodPriortoMaturityDateofSecuredDebt_758595E558FE22D1FF4D4B89CA49B01C" xlink:type="locator" />
    <link:definitionArc order="24" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_uis_LineofCreditFacilitySpringingMaturityDatePeriodPriortoMaturityDateofSecuredDebt_758595E558FE22D1FF4D4B89CA49B01C" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_DebtInstrumentCovenantMinimumFixedChargeCoverageRatioAvailableBorrowingsThresholdPercentofLenderCommitments" xlink:label="loc_uis_DebtInstrumentCovenantMinimumFixedChargeCoverageRatioAvailableBorrowingsThresholdPercentofLenderCommitments_95A085C93EABA67A948C4B89CA493E07" xlink:type="locator" />
    <link:definitionArc order="25" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_uis_DebtInstrumentCovenantMinimumFixedChargeCoverageRatioAvailableBorrowingsThresholdPercentofLenderCommitments_95A085C93EABA67A948C4B89CA493E07" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_DebtInstrumentCovenantMinimumFixedChargeCoverageRatioAvailableBorrowingsThreshold" xlink:label="loc_uis_DebtInstrumentCovenantMinimumFixedChargeCoverageRatioAvailableBorrowingsThreshold_12D9DEEBF9272310860B4B89CA490965" xlink:type="locator" />
    <link:definitionArc order="26" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_uis_DebtInstrumentCovenantMinimumFixedChargeCoverageRatioAvailableBorrowingsThreshold_12D9DEEBF9272310860B4B89CA490965" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_DebtInstrumentDebtDefaultTriggeringEventThresholdAmount" xlink:label="loc_uis_DebtInstrumentDebtDefaultTriggeringEventThresholdAmount_B9816994D82D23ABEC564B89CA4A40BE" xlink:type="locator" />
    <link:definitionArc order="27" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFB259E405D855AD97C04B89CA45C12A" xlink:to="loc_uis_DebtInstrumentDebtDefaultTriggeringEventThresholdAmount_B9816994D82D23ABEC564B89CA4A40BE" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/DebtScheduleOfComponentsOfLongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_1878DCD807A9510E0DC72886732DA784" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_0D463043067B8EA157BE2886732B4FEF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1878DCD807A9510E0DC72886732DA784" xlink:to="loc_us-gaap_DebtInstrumentTable_0D463043067B8EA157BE2886732B4FEF" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_A5A21D2B945096014BA02886732C7887" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_0D463043067B8EA157BE2886732B4FEF" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_A5A21D2B945096014BA02886732C7887" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_68EBC6257AE73E0CC7E92886732CB85C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_A5A21D2B945096014BA02886732C7887" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_68EBC6257AE73E0CC7E92886732CB85C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_68EBC6257AE73E0CC7E92886732CB85C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_A5A21D2B945096014BA02886732C7887" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_68EBC6257AE73E0CC7E92886732CB85C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="loc_us-gaap_SeniorNotesMember_968AF200A833E8E300B92886732CF6B5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_68EBC6257AE73E0CC7E92886732CB85C" xlink:to="loc_us-gaap_SeniorNotesMember_968AF200A833E8E300B92886732CF6B5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_9EA9B45B2200C552ECF92886732CBC1A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_0D463043067B8EA157BE2886732B4FEF" xlink:to="loc_us-gaap_DebtInstrumentAxis_9EA9B45B2200C552ECF92886732CBC1A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_45710E8A35CA064738BB2886732DFB46_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_9EA9B45B2200C552ECF92886732CBC1A" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_45710E8A35CA064738BB2886732DFB46_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_45710E8A35CA064738BB2886732DFB46" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_9EA9B45B2200C552ECF92886732CBC1A" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_45710E8A35CA064738BB2886732DFB46" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_TenPointSevenFivePercentageSeniorSecuredNotesDueinAprilTwoThousandTwentyTwoMember" xlink:label="loc_uis_TenPointSevenFivePercentageSeniorSecuredNotesDueinAprilTwoThousandTwentyTwoMember_76340DE2D748ADF27B822886732D8B5A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_45710E8A35CA064738BB2886732DFB46" xlink:to="loc_uis_TenPointSevenFivePercentageSeniorSecuredNotesDueinAprilTwoThousandTwentyTwoMember_76340DE2D748ADF27B822886732D8B5A" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_ConvertibleSeniorNotesDue2021Member" xlink:label="loc_uis_ConvertibleSeniorNotesDue2021Member_1D6D5C335E92E11AA8862886732DE90B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_45710E8A35CA064738BB2886732DFB46" xlink:to="loc_uis_ConvertibleSeniorNotesDue2021Member_1D6D5C335E92E11AA8862886732DE90B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_02C60C6A08188A4207262886732DDC6A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1878DCD807A9510E0DC72886732DA784" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_02C60C6A08188A4207262886732DDC6A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_614A1FD7B50CD8BA96D12886732EC0BA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1878DCD807A9510E0DC72886732DA784" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_614A1FD7B50CD8BA96D12886732EC0BA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscount" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_93890FC26D96B4D71F1B2886732E6132" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1878DCD807A9510E0DC72886732DA784" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_93890FC26D96B4D71F1B2886732E6132" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_2825883B71ECD5DE48DE2886732E7362" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1878DCD807A9510E0DC72886732DA784" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_2825883B71ECD5DE48DE2886732E7362" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiability" xlink:label="loc_us-gaap_FinanceLeaseLiability_DB202582B2C91A2A67522886732E36B5" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1878DCD807A9510E0DC72886732DA784" xlink:to="loc_us-gaap_FinanceLeaseLiability_DB202582B2C91A2A67522886732E36B5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLongTermDebt" xlink:label="loc_us-gaap_OtherLongTermDebt_9CF5A71BBB6F63CF5C1E2886732FE9F6" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1878DCD807A9510E0DC72886732DA784" xlink:to="loc_us-gaap_OtherLongTermDebt_9CF5A71BBB6F63CF5C1E2886732FE9F6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_E2B0624B5D0B7926D8272886732F9044" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1878DCD807A9510E0DC72886732DA784" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_E2B0624B5D0B7926D8272886732F9044" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_D736FA35B4BEC9CD003A2886732FA0BA" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1878DCD807A9510E0DC72886732DA784" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_D736FA35B4BEC9CD003A2886732FA0BA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_E17CD909D6CA4BA1E23F2886732FADC4" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1878DCD807A9510E0DC72886732DA784" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_E17CD909D6CA4BA1E23F2886732FADC4" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/DebtScheduleOfInterestExpenseDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_4FE370A6BE3F00D0F9B728867312178E" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_FBAF13953C7F9B6A2F3E288673100E03" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4FE370A6BE3F00D0F9B728867312178E" xlink:to="loc_us-gaap_DebtInstrumentTable_FBAF13953C7F9B6A2F3E288673100E03" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_7146C54893A1A8950F4E28867310290B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_FBAF13953C7F9B6A2F3E288673100E03" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_7146C54893A1A8950F4E28867310290B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_D9D1797E5ED3C306C4E1288673102931_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_7146C54893A1A8950F4E28867310290B" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_D9D1797E5ED3C306C4E1288673102931_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_D9D1797E5ED3C306C4E1288673102931" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_7146C54893A1A8950F4E28867310290B" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_D9D1797E5ED3C306C4E1288673102931" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="loc_us-gaap_SeniorNotesMember_B10A4D513C13AF045EA528867310B937" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_D9D1797E5ED3C306C4E1288673102931" xlink:to="loc_us-gaap_SeniorNotesMember_B10A4D513C13AF045EA528867310B937" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_196F7B79B7B1CAA264F7288673118CEB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_FBAF13953C7F9B6A2F3E288673100E03" xlink:to="loc_us-gaap_DebtInstrumentAxis_196F7B79B7B1CAA264F7288673118CEB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_A5C8557AD1077897F20028867311B57B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_196F7B79B7B1CAA264F7288673118CEB" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_A5C8557AD1077897F20028867311B57B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_A5C8557AD1077897F20028867311B57B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_196F7B79B7B1CAA264F7288673118CEB" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_A5C8557AD1077897F20028867311B57B" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_SeniorSecuredNotesDue2022Member" xlink:label="loc_uis_SeniorSecuredNotesDue2022Member_110A83801CAED4CCF3A128867311A6EB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_A5C8557AD1077897F20028867311B57B" xlink:to="loc_uis_SeniorSecuredNotesDue2022Member_110A83801CAED4CCF3A128867311A6EB" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_ConvertibleSeniorNotesDue2021Member" xlink:label="loc_uis_ConvertibleSeniorNotesDue2021Member_780CD6DCCAF610C885EA288673117BAA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_A5C8557AD1077897F20028867311B57B" xlink:to="loc_uis_ConvertibleSeniorNotesDue2021Member_780CD6DCCAF610C885EA288673117BAA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestExpenseDebtExcludingAmortization" xlink:label="loc_us-gaap_InterestExpenseDebtExcludingAmortization_C8B5B6138C80884E8A0C288673121EBF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4FE370A6BE3F00D0F9B728867312178E" xlink:to="loc_us-gaap_InterestExpenseDebtExcludingAmortization_C8B5B6138C80884E8A0C288673121EBF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AmortizationOfDebtDiscountPremium" xlink:label="loc_us-gaap_AmortizationOfDebtDiscountPremium_BF8E027A3AF046146BA928867312A51E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4FE370A6BE3F00D0F9B728867312178E" xlink:to="loc_us-gaap_AmortizationOfDebtDiscountPremium_BF8E027A3AF046146BA928867312A51E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AmortizationOfFinancingCosts" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_07C446FBF58BE07A390528867312AE0D" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4FE370A6BE3F00D0F9B728867312178E" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_07C446FBF58BE07A390528867312AE0D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestExpenseDebt" xlink:label="loc_us-gaap_InterestExpenseDebt_624DD36CD29E97A3FCFA288673125906" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4FE370A6BE3F00D0F9B728867312178E" xlink:to="loc_us-gaap_InterestExpenseDebt_624DD36CD29E97A3FCFA288673125906" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/DebtTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/DocumentAndEntityInformation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/EarningsPerShare" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/EarningsPerShareComputationOfEarningsPerCommonShareAttributableToUnisysCorporationDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_E1EE027949C3A4BBEEFC1A1FE902C131" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_6E39CBBB1689EA3EF9C01A1FE901B3BC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_E1EE027949C3A4BBEEFC1A1FE902C131" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_6E39CBBB1689EA3EF9C01A1FE901B3BC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_D99231F04207CFD0E2931A1FE901DE38" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_6E39CBBB1689EA3EF9C01A1FE901B3BC" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_D99231F04207CFD0E2931A1FE901DE38" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_19F0CBCAB9216EB4F40A1A1FE9017653_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_D99231F04207CFD0E2931A1FE901DE38" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_19F0CBCAB9216EB4F40A1A1FE9017653_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_19F0CBCAB9216EB4F40A1A1FE9017653" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_D99231F04207CFD0E2931A1FE901DE38" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_19F0CBCAB9216EB4F40A1A1FE9017653" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_StockOptionsAndRestrictedStockUnitsMember" xlink:label="loc_uis_StockOptionsAndRestrictedStockUnitsMember_18C6E00A84337E11394F1A1FE9018F6B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_19F0CBCAB9216EB4F40A1A1FE9017653" xlink:to="loc_uis_StockOptionsAndRestrictedStockUnitsMember_18C6E00A84337E11394F1A1FE9018F6B" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_ConvertibleSeniorNotesFivePointFivePercentDueTwentyTwentyOneMember" xlink:label="loc_uis_ConvertibleSeniorNotesFivePointFivePercentDueTwentyTwentyOneMember_EFE44EDC5E087BC5E6C01A1FE902DFB6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_19F0CBCAB9216EB4F40A1A1FE9017653" xlink:to="loc_uis_ConvertibleSeniorNotesFivePointFivePercentDueTwentyTwentyOneMember_EFE44EDC5E087BC5E6C01A1FE902DFB6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_3579C5B02488578048B21A1FE902FB27" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_E1EE027949C3A4BBEEFC1A1FE902C131" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_3579C5B02488578048B21A1FE902FB27" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_3AAB271ED8D4AC0D66D31A1FE90224C1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_E1EE027949C3A4BBEEFC1A1FE902C131" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_3AAB271ED8D4AC0D66D31A1FE90224C1" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/EarningsPerShareTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/FinancialInstrumentsAndFairValueMeasurements" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/FinancialInstrumentsAndFairValueMeasurementsAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:href="uis-20190630.xsd#uis_FairValueMeasurementsDisclosureLineItems" xlink:label="loc_uis_FairValueMeasurementsDisclosureLineItems_0F4B70B4886F1A23E9DC4B89CAC2E971" xlink:type="locator" />
    <link:loc xlink:href="uis-20190630.xsd#uis_FairValueMeasurementsDisclosureTable" xlink:label="loc_uis_FairValueMeasurementsDisclosureTable_B09D5A70E8B0B7EBD41F4B89CAC0BF10" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_uis_FairValueMeasurementsDisclosureLineItems_0F4B70B4886F1A23E9DC4B89CAC2E971" xlink:to="loc_uis_FairValueMeasurementsDisclosureTable_B09D5A70E8B0B7EBD41F4B89CAC0BF10" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_F30B4ACC4042F4CAD92C4B89CAC192C8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_uis_FairValueMeasurementsDisclosureTable_B09D5A70E8B0B7EBD41F4B89CAC0BF10" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_F30B4ACC4042F4CAD92C4B89CAC192C8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_91DEA9164F0BC0F074BD4B89CAC1F46A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_F30B4ACC4042F4CAD92C4B89CAC192C8" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_91DEA9164F0BC0F074BD4B89CAC1F46A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_91DEA9164F0BC0F074BD4B89CAC1F46A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_F30B4ACC4042F4CAD92C4B89CAC192C8" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_91DEA9164F0BC0F074BD4B89CAC1F46A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignExchangeForwardMember" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_5EDE2625A272C019E72B4B89CAC1093A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_91DEA9164F0BC0F074BD4B89CAC1F46A" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_5EDE2625A272C019E72B4B89CAC1093A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeTermOfContract" xlink:label="loc_us-gaap_DerivativeTermOfContract_C272E8BA67584BBE7D454B89CAC20234" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_uis_FairValueMeasurementsDisclosureLineItems_0F4B70B4886F1A23E9DC4B89CAC2E971" xlink:to="loc_us-gaap_DerivativeTermOfContract_C272E8BA67584BBE7D454B89CAC20234" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeAssetNotionalAmount" xlink:label="loc_us-gaap_DerivativeAssetNotionalAmount_DEBBEA24BDE0DE22E5764B89CAC235CD" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_uis_FairValueMeasurementsDisclosureLineItems_0F4B70B4886F1A23E9DC4B89CAC2E971" xlink:to="loc_us-gaap_DerivativeAssetNotionalAmount_DEBBEA24BDE0DE22E5764B89CAC235CD" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/FinancialInstrumentsAndFairValueMeasurementsFairValueOfForeignExchangeForwardContractsByBalanceSheetLocationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_9F699B16C4B5F6B70B010E25B66B6535" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingTable" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_E860AE6B2F203BC3AD150E25B66631F6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_9F699B16C4B5F6B70B010E25B66B6535" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_E860AE6B2F203BC3AD150E25B66631F6" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_FA4910C9BB6BF14601940E25B666DD4C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_E860AE6B2F203BC3AD150E25B66631F6" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_FA4910C9BB6BF14601940E25B666DD4C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_8B5DC385C3EA30A5C2A70E25B666C849_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_FA4910C9BB6BF14601940E25B666DD4C" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_8B5DC385C3EA30A5C2A70E25B666C849_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_8B5DC385C3EA30A5C2A70E25B666C849" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_FA4910C9BB6BF14601940E25B666DD4C" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_8B5DC385C3EA30A5C2A70E25B666C849" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignExchangeForwardMember" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_39E84D733903823043F70E25B666D04A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_8B5DC385C3EA30A5C2A70E25B666C849" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_39E84D733903823043F70E25B666D04A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_6EAB41B380B2C5F987320E25B66661DD" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_E860AE6B2F203BC3AD150E25B66631F6" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_6EAB41B380B2C5F987320E25B66661DD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_939DB28BC6FAA1C436190E25B6664926_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_6EAB41B380B2C5F987320E25B66661DD" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_939DB28BC6FAA1C436190E25B6664926_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_939DB28BC6FAA1C436190E25B6664926" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_6EAB41B380B2C5F987320E25B66661DD" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_939DB28BC6FAA1C436190E25B6664926" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember" xlink:label="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_FD1E8FF4561BB71E0FC80E25B66692D4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_939DB28BC6FAA1C436190E25B6664926" xlink:to="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_FD1E8FF4561BB71E0FC80E25B66692D4" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_OtherAccruedLiabilitiesMember" xlink:label="loc_uis_OtherAccruedLiabilitiesMember_9A0BD19B272DAF996C780E25B66AC762" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_939DB28BC6FAA1C436190E25B6664926" xlink:to="loc_uis_OtherAccruedLiabilitiesMember_9A0BD19B272DAF996C780E25B66AC762" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_B0363BD81AAAC32154990E25B66A82BF" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_E860AE6B2F203BC3AD150E25B66631F6" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_B0363BD81AAAC32154990E25B66A82BF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_476AD854CA32C4B123C00E25B66AA7DC_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_B0363BD81AAAC32154990E25B66A82BF" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_476AD854CA32C4B123C00E25B66AA7DC_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_476AD854CA32C4B123C00E25B66AA7DC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_B0363BD81AAAC32154990E25B66A82BF" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_476AD854CA32C4B123C00E25B66AA7DC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_4DE9633CC25347409EBF0E25B66A0E56" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_476AD854CA32C4B123C00E25B66AA7DC" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_4DE9633CC25347409EBF0E25B66A0E56" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeAssets" xlink:label="loc_us-gaap_DerivativeAssets_825447BBE5E07913F0E10E25B66B6D18" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_9F699B16C4B5F6B70B010E25B66B6535" xlink:to="loc_us-gaap_DerivativeAssets_825447BBE5E07913F0E10E25B66B6D18" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeLiabilities_2E7AF83E81CBFE420FF10E25B66CDB11" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_9F699B16C4B5F6B70B010E25B66B6535" xlink:to="loc_us-gaap_DerivativeLiabilities_2E7AF83E81CBFE420FF10E25B66CDB11" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet" xlink:label="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_4ACED2D905ED02566EFB0E25B66CDE36" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_9F699B16C4B5F6B70B010E25B66B6535" xlink:to="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_4ACED2D905ED02566EFB0E25B66CDE36" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/FinancialInstrumentsAndFairValueMeasurementsFairValuesOfOtherFinancialInstrumentsNotMeasuredAtFairValueInConsolidatedBalanceSheetsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_A52F91A511B8508AE4A40E25B392C973" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_3A3A76FCA88B36C15AE70E25B38DF7E7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_A52F91A511B8508AE4A40E25B392C973" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_3A3A76FCA88B36C15AE70E25B38DF7E7" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_6D4F924875F75A7712E50E25B38DD3EA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_3A3A76FCA88B36C15AE70E25B38DF7E7" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_6D4F924875F75A7712E50E25B38DD3EA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_D54F2F5343C4912B79150E25B38D270E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_6D4F924875F75A7712E50E25B38DD3EA" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_D54F2F5343C4912B79150E25B38D270E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_E0734F4C04075FC1C5F80E25B38D8F60" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_6D4F924875F75A7712E50E25B38DD3EA" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_E0734F4C04075FC1C5F80E25B38D8F60" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_D54F2F5343C4912B79150E25B38D270E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_E0734F4C04075FC1C5F80E25B38D8F60" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_D54F2F5343C4912B79150E25B38D270E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_88C89F006C3395CDDA920E25B38DE62A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_E0734F4C04075FC1C5F80E25B38D8F60" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_88C89F006C3395CDDA920E25B38DE62A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_A7E9B07310CA708110B00E25B38F4125" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_3A3A76FCA88B36C15AE70E25B38DF7E7" xlink:to="loc_us-gaap_DebtInstrumentAxis_A7E9B07310CA708110B00E25B38F4125" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_CEE2C401EBEA286C23FD0E25B38F0379_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_A7E9B07310CA708110B00E25B38F4125" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_CEE2C401EBEA286C23FD0E25B38F0379_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_CEE2C401EBEA286C23FD0E25B38F0379" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_A7E9B07310CA708110B00E25B38F4125" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_CEE2C401EBEA286C23FD0E25B38F0379" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_TenPointSevenFivePercentageSeniorSecuredNotesDueinAprilTwoThousandTwentyTwoMember" xlink:label="loc_uis_TenPointSevenFivePercentageSeniorSecuredNotesDueinAprilTwoThousandTwentyTwoMember_B827E7DA0B6F880994040E25B390BD4E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_CEE2C401EBEA286C23FD0E25B38F0379" xlink:to="loc_uis_TenPointSevenFivePercentageSeniorSecuredNotesDueinAprilTwoThousandTwentyTwoMember_B827E7DA0B6F880994040E25B390BD4E" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_ConvertibleSeniorNotesDue2021Member" xlink:label="loc_uis_ConvertibleSeniorNotesDue2021Member_84639C5A3B115A8009B10E25B3915818" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_CEE2C401EBEA286C23FD0E25B38F0379" xlink:to="loc_uis_ConvertibleSeniorNotesDue2021Member_84639C5A3B115A8009B10E25B3915818" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_120A5497A99AC022351E0E25B39179FA" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_3A3A76FCA88B36C15AE70E25B38DF7E7" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_120A5497A99AC022351E0E25B39179FA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_65649FCA373320BFDD5C0E25B391A248_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_120A5497A99AC022351E0E25B39179FA" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_65649FCA373320BFDD5C0E25B391A248_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_65649FCA373320BFDD5C0E25B391A248" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_120A5497A99AC022351E0E25B39179FA" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_65649FCA373320BFDD5C0E25B391A248" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="loc_us-gaap_SeniorNotesMember_0D70BB9B50440B96E0F60E25B39108DE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_65649FCA373320BFDD5C0E25B391A248" xlink:to="loc_us-gaap_SeniorNotesMember_0D70BB9B50440B96E0F60E25B39108DE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_208FC1F188E0EE8302EA0E25B392129E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_A52F91A511B8508AE4A40E25B392C973" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_208FC1F188E0EE8302EA0E25B392129E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtFairValue" xlink:label="loc_us-gaap_LongTermDebtFairValue_C7B18726593153A19B0C0E25B3933772" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_A52F91A511B8508AE4A40E25B392C973" xlink:to="loc_us-gaap_LongTermDebtFairValue_C7B18726593153A19B0C0E25B3933772" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_4D507D6BD12400B213310E25B393C5CB" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_A52F91A511B8508AE4A40E25B392C973" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_4D507D6BD12400B213310E25B393C5CB" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/FinancialInstrumentsAndFairValueMeasurementsGainsAndLossesRecognizedOnForeignExchangeForwardContractsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasuredOnRecurringBasisGainLossIncludedInEarningsAbstract" xlink:label="loc_us-gaap_FairValueMeasuredOnRecurringBasisGainLossIncludedInEarningsAbstract_F916F9515A1F874C55C87520E6B11800" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasuredOnRecurringBasisGainLossIncludedInEarningsTable" xlink:label="loc_us-gaap_FairValueMeasuredOnRecurringBasisGainLossIncludedInEarningsTable_6A25C3E8B564D33DD5757520E6B09BA3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueMeasuredOnRecurringBasisGainLossIncludedInEarningsAbstract_F916F9515A1F874C55C87520E6B11800" xlink:to="loc_us-gaap_FairValueMeasuredOnRecurringBasisGainLossIncludedInEarningsTable_6A25C3E8B564D33DD5757520E6B09BA3" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_8142F2D9D3F01F75BE337520E6B031D7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueMeasuredOnRecurringBasisGainLossIncludedInEarningsTable_6A25C3E8B564D33DD5757520E6B09BA3" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_8142F2D9D3F01F75BE337520E6B031D7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_BB4696741B33D452F9457520E6B17433_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_8142F2D9D3F01F75BE337520E6B031D7" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_BB4696741B33D452F9457520E6B17433_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_BB4696741B33D452F9457520E6B17433" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_8142F2D9D3F01F75BE337520E6B031D7" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_BB4696741B33D452F9457520E6B17433" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_OtherIncomeExpenseNetMember" xlink:label="loc_uis_OtherIncomeExpenseNetMember_D78442E66A09A4401F017520E6B1A0D8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_BB4696741B33D452F9457520E6B17433" xlink:to="loc_uis_OtherIncomeExpenseNetMember_D78442E66A09A4401F017520E6B1A0D8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings" xlink:label="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_CA2F7138AA6E6C64226B75246355EA1A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasuredOnRecurringBasisGainLossIncludedInEarningsAbstract_F916F9515A1F874C55C87520E6B11800" xlink:to="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_CA2F7138AA6E6C64226B75246355EA1A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GainLossOnForeignCurrencyDerivativesRecordedInEarningsNet" xlink:label="loc_us-gaap_GainLossOnForeignCurrencyDerivativesRecordedInEarningsNet_CF6793621965DD383C817520E6B1F731" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasuredOnRecurringBasisGainLossIncludedInEarningsAbstract_F916F9515A1F874C55C87520E6B11800" xlink:to="loc_us-gaap_GainLossOnForeignCurrencyDerivativesRecordedInEarningsNet_CF6793621965DD383C817520E6B1F731" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/FinancialInstrumentsAndFairValueMeasurementsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/Goodwill" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/GoodwillDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillLineItems" xlink:label="loc_us-gaap_GoodwillLineItems_8A8A65CCC28D7AD91A840E25B31564E1" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfGoodwillTable" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_A6A2F928F449B2894C200E25B31171B0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_8A8A65CCC28D7AD91A840E25B31564E1" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_A6A2F928F449B2894C200E25B31171B0" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_CB5CC30735E32328AE9C0E25B312A15A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_A6A2F928F449B2894C200E25B31171B0" xlink:to="loc_srt_ProductOrServiceAxis_CB5CC30735E32328AE9C0E25B312A15A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_C7F5AEA9E1358EC284590E25B313AF5F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_CB5CC30735E32328AE9C0E25B312A15A" xlink:to="loc_srt_ProductsAndServicesDomain_C7F5AEA9E1358EC284590E25B313AF5F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_C7F5AEA9E1358EC284590E25B313AF5F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_CB5CC30735E32328AE9C0E25B312A15A" xlink:to="loc_srt_ProductsAndServicesDomain_C7F5AEA9E1358EC284590E25B313AF5F" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_BusinessProcessOutsourcingServicesMember" xlink:label="loc_uis_BusinessProcessOutsourcingServicesMember_43D1AAE8CC437BD0F0870E25B313C3BF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_C7F5AEA9E1358EC284590E25B313AF5F" xlink:to="loc_uis_BusinessProcessOutsourcingServicesMember_43D1AAE8CC437BD0F0870E25B313C3BF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_3B36203176F894B2F9820E25B3148FE3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_A6A2F928F449B2894C200E25B31171B0" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_3B36203176F894B2F9820E25B3148FE3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_DAF566EB453821D0DEF60E25B314BECB_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_3B36203176F894B2F9820E25B3148FE3" xlink:to="loc_us-gaap_SegmentDomain_DAF566EB453821D0DEF60E25B314BECB_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_DAF566EB453821D0DEF60E25B314BECB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_3B36203176F894B2F9820E25B3148FE3" xlink:to="loc_us-gaap_SegmentDomain_DAF566EB453821D0DEF60E25B314BECB" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_ServicesMember" xlink:label="loc_uis_ServicesMember_055731C176B0400AD4660E25B3147E3F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_DAF566EB453821D0DEF60E25B314BECB" xlink:to="loc_uis_ServicesMember_055731C176B0400AD4660E25B3147E3F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_08B0D1C1D5C7C62257740E25B3164BB1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_8A8A65CCC28D7AD91A840E25B31564E1" xlink:to="loc_us-gaap_Goodwill_08B0D1C1D5C7C62257740E25B3164BB1" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/GoodwillScheduleOfChangesInCarryingAmountOfGoodwillBySegmentDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillLineItems" xlink:label="loc_us-gaap_GoodwillLineItems_0E60CBAB03C259C3F9090E25B33D8CE7" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfGoodwillTable" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_E35DD4BD4586551005370E25B33D1FF5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_0E60CBAB03C259C3F9090E25B33D8CE7" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_E35DD4BD4586551005370E25B33D1FF5" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_9842A9B67A9A150E7B500E25B33D07AA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_E35DD4BD4586551005370E25B33D1FF5" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_9842A9B67A9A150E7B500E25B33D07AA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_390E9AD5EFE3A6A774E60E25B33D241F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_9842A9B67A9A150E7B500E25B33D07AA" xlink:to="loc_us-gaap_SegmentDomain_390E9AD5EFE3A6A774E60E25B33D241F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_390E9AD5EFE3A6A774E60E25B33D241F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_9842A9B67A9A150E7B500E25B33D07AA" xlink:to="loc_us-gaap_SegmentDomain_390E9AD5EFE3A6A774E60E25B33D241F" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_ServicesMember" xlink:label="loc_uis_ServicesMember_63027F96D6888A42C1970E25B33DC3E3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_390E9AD5EFE3A6A774E60E25B33D241F" xlink:to="loc_uis_ServicesMember_63027F96D6888A42C1970E25B33DC3E3" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_TechnologyMember" xlink:label="loc_uis_TechnologyMember_B90605A875BB6E2D64E40E25B33D2ED4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_390E9AD5EFE3A6A774E60E25B33D241F" xlink:to="loc_uis_TechnologyMember_B90605A875BB6E2D64E40E25B33D2ED4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillRollForward" xlink:label="loc_us-gaap_GoodwillRollForward_5F71D0A1E2EC03B276F20E25B341CBAD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_0E60CBAB03C259C3F9090E25B33D8CE7" xlink:to="loc_us-gaap_GoodwillRollForward_5F71D0A1E2EC03B276F20E25B341CBAD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_9BF3D50D225FCB89BA820E25B3419D27" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_5F71D0A1E2EC03B276F20E25B341CBAD" xlink:to="loc_us-gaap_Goodwill_9BF3D50D225FCB89BA820E25B3419D27" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_F6A2C9B650C80E64A3D30E25B3428B9D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_5F71D0A1E2EC03B276F20E25B341CBAD" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_F6A2C9B650C80E64A3D30E25B3428B9D" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/GoodwillTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/IncomeTaxes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/PensionAndPostretirementBenefits" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/PensionAndPostretirementBenefitsAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_98831BBD8E98971FCAA5477A7ACF977C" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_2CE5AF5B8A57CCA37BA1477A7ACD98AF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_98831BBD8E98971FCAA5477A7ACF977C" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_2CE5AF5B8A57CCA37BA1477A7ACD98AF" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_BC5D24C5462EB7EEB075477A7ACD2386" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_2CE5AF5B8A57CCA37BA1477A7ACD98AF" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_BC5D24C5462EB7EEB075477A7ACD2386" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_DAFE535D341AA7F9417E477A7ACE9242_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_BC5D24C5462EB7EEB075477A7ACD2386" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_DAFE535D341AA7F9417E477A7ACE9242_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_DAFE535D341AA7F9417E477A7ACE9242" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_BC5D24C5462EB7EEB075477A7ACD2386" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_DAFE535D341AA7F9417E477A7ACE9242" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_F010DB7675BD768DCC18477A7ACEA09E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_DAFE535D341AA7F9417E477A7ACE9242" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_F010DB7675BD768DCC18477A7ACEA09E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_DBFBCB37CC020BC10896477A7ACE7310" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_DAFE535D341AA7F9417E477A7ACE9242" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_DBFBCB37CC020BC10896477A7ACE7310" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_5D96903659E16BD2B671477A7ACE1303" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_2CE5AF5B8A57CCA37BA1477A7ACD98AF" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_5D96903659E16BD2B671477A7ACE1303" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_8F2F73DC72DE2B7C110A477A7ACF7046_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_5D96903659E16BD2B671477A7ACE1303" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_8F2F73DC72DE2B7C110A477A7ACF7046_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_8F2F73DC72DE2B7C110A477A7ACF7046" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_5D96903659E16BD2B671477A7ACE1303" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_8F2F73DC72DE2B7C110A477A7ACF7046" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_FB69E8F468B4E9067A2B477A7ACF4043" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_8F2F73DC72DE2B7C110A477A7ACF7046" xlink:to="loc_country_US_FB69E8F468B4E9067A2B477A7ACF4043" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignPlanMember" xlink:label="loc_us-gaap_ForeignPlanMember_3ADF98DC41A7B55D2408477A7ACFB835" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_8F2F73DC72DE2B7C110A477A7ACF7046" xlink:to="loc_us-gaap_ForeignPlanMember_3ADF98DC41A7B55D2408477A7ACFB835" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsCurrentFiscalYear" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsCurrentFiscalYear_32777BE0AFDE0F2304EF477A7AD0047F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_98831BBD8E98971FCAA5477A7ACF977C" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsCurrentFiscalYear_32777BE0AFDE0F2304EF477A7AD0047F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionContributions" xlink:label="loc_us-gaap_PensionContributions_12839935C05F6231B5F4477A7AD07C10" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_98831BBD8E98971FCAA5477A7ACF977C" xlink:to="loc_us-gaap_PensionContributions_12839935C05F6231B5F4477A7AD07C10" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherPostretirementBenefitsPayments" xlink:label="loc_us-gaap_OtherPostretirementBenefitsPayments_E770B4C08B5A13478B29477A7AD0CEDF" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_98831BBD8E98971FCAA5477A7ACF977C" xlink:to="loc_us-gaap_OtherPostretirementBenefitsPayments_E770B4C08B5A13478B29477A7AD0CEDF" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/PensionAndPostretirementBenefitsComponentsOfNetPeriodicBenefitExpenseDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_64FFE5BD762182A786B32839D0D0E868" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_8D0AE147EF4CF37E3F652839D0CAD2BE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_64FFE5BD762182A786B32839D0D0E868" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_8D0AE147EF4CF37E3F652839D0CAD2BE" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_531B34A0CF9E4E22A2FA2839D0CA78C5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_8D0AE147EF4CF37E3F652839D0CAD2BE" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_531B34A0CF9E4E22A2FA2839D0CA78C5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_C6AC1F4C276EA6F660A32839D0CA10BE_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_531B34A0CF9E4E22A2FA2839D0CA78C5" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_C6AC1F4C276EA6F660A32839D0CA10BE_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_C6AC1F4C276EA6F660A32839D0CA10BE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_531B34A0CF9E4E22A2FA2839D0CA78C5" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_C6AC1F4C276EA6F660A32839D0CA10BE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_7052A7B75D52700FC88F2839D0CE062E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_C6AC1F4C276EA6F660A32839D0CA10BE" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_7052A7B75D52700FC88F2839D0CE062E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_89E05CCE442A28A937102839D0CE1086" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_C6AC1F4C276EA6F660A32839D0CA10BE" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_89E05CCE442A28A937102839D0CE1086" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_54A7154C9BD2432D2B152839D0CEA4A3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_8D0AE147EF4CF37E3F652839D0CAD2BE" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_54A7154C9BD2432D2B152839D0CEA4A3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_72C497A8B2F50FBA6F802839D0CF5ADD_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_54A7154C9BD2432D2B152839D0CEA4A3" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_72C497A8B2F50FBA6F802839D0CF5ADD_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_72C497A8B2F50FBA6F802839D0CF5ADD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_54A7154C9BD2432D2B152839D0CEA4A3" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_72C497A8B2F50FBA6F802839D0CF5ADD" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_EFE3EE125BB7F3ABADE42839D0CF259D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_72C497A8B2F50FBA6F802839D0CF5ADD" xlink:to="loc_country_US_EFE3EE125BB7F3ABADE42839D0CF259D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignPlanMember" xlink:label="loc_us-gaap_ForeignPlanMember_66080744488D5800999D2839D0D00DA2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_72C497A8B2F50FBA6F802839D0CF5ADD" xlink:to="loc_us-gaap_ForeignPlanMember_66080744488D5800999D2839D0D00DA2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_BCB886E5A443C9BF16692839D0D07080" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_64FFE5BD762182A786B32839D0D0E868" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_BCB886E5A443C9BF16692839D0D07080" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_2E2D86EA8FAADE57F63F2839D0D0FB79" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_64FFE5BD762182A786B32839D0D0E868" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_2E2D86EA8FAADE57F63F2839D0D0FB79" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_6BA3DCFBC7EB289CE2D62839D0D08ECD" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_64FFE5BD762182A786B32839D0D0E868" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_6BA3DCFBC7EB289CE2D62839D0D08ECD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_9A04EF963CF71A2FB7972839D0D00002" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_64FFE5BD762182A786B32839D0D0E868" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_9A04EF963CF71A2FB7972839D0D00002" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_F5CF6322FB2274F6DCA62839D0D093FA" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_64FFE5BD762182A786B32839D0D0E868" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_F5CF6322FB2274F6DCA62839D0D093FA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_B69E9E70E15EF81814E32839D0D06856" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_64FFE5BD762182A786B32839D0D0E868" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_B69E9E70E15EF81814E32839D0D06856" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/PensionAndPostretirementBenefitsTables" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_6CA38563B4F1F79E036E0E25B59C2BC1" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_E0631EEA71A4CCCF4A390E25B59CAEF6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_6CA38563B4F1F79E036E0E25B59C2BC1" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_E0631EEA71A4CCCF4A390E25B59CAEF6" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_93A948ECE3AFD97628760E25B59C9E14" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_E0631EEA71A4CCCF4A390E25B59CAEF6" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_93A948ECE3AFD97628760E25B59C9E14" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_5EDD69EA70DF9B9D11A50E25B59C2A7F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_93A948ECE3AFD97628760E25B59C9E14" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_5EDD69EA70DF9B9D11A50E25B59C2A7F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_5EDD69EA70DF9B9D11A50E25B59C2A7F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_93A948ECE3AFD97628760E25B59C9E14" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_5EDD69EA70DF9B9D11A50E25B59C2A7F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_643FF89FF6F9E46AA6240E25B59CDF65" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_5EDD69EA70DF9B9D11A50E25B59C2A7F" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_643FF89FF6F9E46AA6240E25B59CDF65" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_8333511708C35C90AAE10E25B59CC544" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_5EDD69EA70DF9B9D11A50E25B59C2A7F" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_8333511708C35C90AAE10E25B59CC544" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfNetBenefitCostsTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_1BD81C81717F5161FB370E25B59C906B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_6CA38563B4F1F79E036E0E25B59C2BC1" xlink:to="loc_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_1BD81C81717F5161FB370E25B59C906B" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/Properties" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/PropertiesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/RemainingPerformanceObligations" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/RemainingPerformanceObligationsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_17CB35081F8F8A72EAC20E25B5CD5D6C" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_58D73ECC09E52AC60EBE0E25B5CDCA7A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_17CB35081F8F8A72EAC20E25B5CD5D6C" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_58D73ECC09E52AC60EBE0E25B5CDCA7A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_8833281251952E785A6A0E25B5CD9C6A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_58D73ECC09E52AC60EBE0E25B5CDCA7A" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_8833281251952E785A6A0E25B5CD9C6A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_1CDE7CEF46F82ED4864A0E25B5CD032F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_17CB35081F8F8A72EAC20E25B5CD5D6C" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_1CDE7CEF46F82ED4864A0E25B5CD032F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_7CF831EF5F56F77E1D690E25B5CDFDFB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_17CB35081F8F8A72EAC20E25B5CD5D6C" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_7CF831EF5F56F77E1D690E25B5CDFDFB" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/SegmentInformation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/SegmentInformationAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_A83D125AAEF6237B73454B89C9BE7514" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_E1FC805CACEEFA4D3BAF4B89C9BB037E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_A83D125AAEF6237B73454B89C9BE7514" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_E1FC805CACEEFA4D3BAF4B89C9BB037E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_8907554A409991FD6D314B89C9BC1E46" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_E1FC805CACEEFA4D3BAF4B89C9BB037E" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_8907554A409991FD6D314B89C9BC1E46" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_503F15E58260E09A01F04B89C9BCABCA_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_8907554A409991FD6D314B89C9BC1E46" xlink:to="loc_us-gaap_SegmentDomain_503F15E58260E09A01F04B89C9BCABCA_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_503F15E58260E09A01F04B89C9BCABCA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_8907554A409991FD6D314B89C9BC1E46" xlink:to="loc_us-gaap_SegmentDomain_503F15E58260E09A01F04B89C9BCABCA" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_TechnologyMember" xlink:label="loc_uis_TechnologyMember_17D79E482EC1A28BB0B44B89C9BC73BB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_503F15E58260E09A01F04B89C9BCABCA" xlink:to="loc_uis_TechnologyMember_17D79E482EC1A28BB0B44B89C9BC73BB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_84436A8B99918A3679604B89C9BDAC1A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_E1FC805CACEEFA4D3BAF4B89C9BB037E" xlink:to="loc_srt_ProductOrServiceAxis_84436A8B99918A3679604B89C9BDAC1A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_EE26893FA742466CE53F4B89C9BD1F8B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_84436A8B99918A3679604B89C9BDAC1A" xlink:to="loc_srt_ProductsAndServicesDomain_EE26893FA742466CE53F4B89C9BD1F8B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_EE26893FA742466CE53F4B89C9BD1F8B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_84436A8B99918A3679604B89C9BDAC1A" xlink:to="loc_srt_ProductsAndServicesDomain_EE26893FA742466CE53F4B89C9BD1F8B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LicenseAndMaintenanceMember" xlink:label="loc_us-gaap_LicenseAndMaintenanceMember_A5E82177BF252504F4C24B89C9BD37BA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_EE26893FA742466CE53F4B89C9BD1F8B" xlink:to="loc_us-gaap_LicenseAndMaintenanceMember_A5E82177BF252504F4C24B89C9BD37BA" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_OtherTechnologyMember" xlink:label="loc_uis_OtherTechnologyMember_740BBA4CD556B1AB451C4B89C9BDAD1E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_EE26893FA742466CE53F4B89C9BD1F8B" xlink:to="loc_uis_OtherTechnologyMember_740BBA4CD556B1AB451C4B89C9BDAD1E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsAxis" xlink:label="loc_srt_ConsolidationItemsAxis_3E72C928369C246100064B89C9BD916C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_E1FC805CACEEFA4D3BAF4B89C9BB037E" xlink:to="loc_srt_ConsolidationItemsAxis_3E72C928369C246100064B89C9BD916C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_6152413D99302A25F7514B89C9BD1485_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_3E72C928369C246100064B89C9BD916C" xlink:to="loc_srt_ConsolidationItemsDomain_6152413D99302A25F7514B89C9BD1485_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_6152413D99302A25F7514B89C9BD1485" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_3E72C928369C246100064B89C9BD916C" xlink:to="loc_srt_ConsolidationItemsDomain_6152413D99302A25F7514B89C9BD1485" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MaterialReconcilingItemsMember" xlink:label="loc_us-gaap_MaterialReconcilingItemsMember_7693AC8094C4B7DD6DD54B89C9BE364E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_6152413D99302A25F7514B89C9BD1485" xlink:to="loc_us-gaap_MaterialReconcilingItemsMember_7693AC8094C4B7DD6DD54B89C9BE364E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_7158F9780228A8DBBB254B89C9BEC5A9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_A83D125AAEF6237B73454B89C9BE7514" xlink:to="loc_us-gaap_Revenues_7158F9780228A8DBBB254B89C9BEC5A9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NumberOfOperatingSegments" xlink:label="loc_us-gaap_NumberOfOperatingSegments_48D3D101E2B0A5B97B7F4B89C9BEFDE6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_A83D125AAEF6237B73454B89C9BE7514" xlink:to="loc_us-gaap_NumberOfOperatingSegments_48D3D101E2B0A5B97B7F4B89C9BEFDE6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_9B52FC5B9FAB537AE8AB4B89C9BF893D" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_A83D125AAEF6237B73454B89C9BE7514" xlink:to="loc_us-gaap_OperatingIncomeLoss_9B52FC5B9FAB537AE8AB4B89C9BF893D" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/SegmentInformationCustomerRevenueByClassesOfSimilarProductsOrServicesDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems" xlink:label="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_A06363B82A05B2E1C9D80E25B50AAA7F" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable" xlink:label="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_3E757158E6138FA261AE0E25B5040C72" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_A06363B82A05B2E1C9D80E25B50AAA7F" xlink:to="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_3E757158E6138FA261AE0E25B5040C72" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_ADC71E6BF657367B6A6D0E25B5056FCA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_3E757158E6138FA261AE0E25B5040C72" xlink:to="loc_srt_ProductOrServiceAxis_ADC71E6BF657367B6A6D0E25B5056FCA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_F02D02CB86EFA8BECDEC0E25B505BA36_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_ADC71E6BF657367B6A6D0E25B5056FCA" xlink:to="loc_srt_ProductsAndServicesDomain_F02D02CB86EFA8BECDEC0E25B505BA36_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_F02D02CB86EFA8BECDEC0E25B505BA36" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_ADC71E6BF657367B6A6D0E25B5056FCA" xlink:to="loc_srt_ProductsAndServicesDomain_F02D02CB86EFA8BECDEC0E25B505BA36" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_CloudAndInfrastructureServicesMember" xlink:label="loc_uis_CloudAndInfrastructureServicesMember_325645529DA504CB19620E25B506EB89" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_F02D02CB86EFA8BECDEC0E25B505BA36" xlink:to="loc_uis_CloudAndInfrastructureServicesMember_325645529DA504CB19620E25B506EB89" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_ApplicationServicesMember" xlink:label="loc_uis_ApplicationServicesMember_3C5DD80DF19FE621FD370E25B5074F99" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_F02D02CB86EFA8BECDEC0E25B505BA36" xlink:to="loc_uis_ApplicationServicesMember_3C5DD80DF19FE621FD370E25B5074F99" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_BusinessProcessOutsourcingServicesMember" xlink:label="loc_uis_BusinessProcessOutsourcingServicesMember_2EB7B04FBBADD0FF3A3B0E25B508AEC8" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_F02D02CB86EFA8BECDEC0E25B505BA36" xlink:to="loc_uis_BusinessProcessOutsourcingServicesMember_2EB7B04FBBADD0FF3A3B0E25B508AEC8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_604D4E3580CEA61F91E00E25B508ACAE" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_3E757158E6138FA261AE0E25B5040C72" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_604D4E3580CEA61F91E00E25B508ACAE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_3C79DCEF5DA0C72FC7520E25B508E25A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_604D4E3580CEA61F91E00E25B508ACAE" xlink:to="loc_us-gaap_SegmentDomain_3C79DCEF5DA0C72FC7520E25B508E25A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_3C79DCEF5DA0C72FC7520E25B508E25A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_604D4E3580CEA61F91E00E25B508ACAE" xlink:to="loc_us-gaap_SegmentDomain_3C79DCEF5DA0C72FC7520E25B508E25A" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_ServicesMember" xlink:label="loc_uis_ServicesMember_3F9A27FB89FB784A95AA0E25B5096CD4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_3C79DCEF5DA0C72FC7520E25B508E25A" xlink:to="loc_uis_ServicesMember_3F9A27FB89FB784A95AA0E25B5096CD4" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_TechnologyMember" xlink:label="loc_uis_TechnologyMember_EF9AC789CAEE9E7701340E25B509201F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_3C79DCEF5DA0C72FC7520E25B508E25A" xlink:to="loc_uis_TechnologyMember_EF9AC789CAEE9E7701340E25B509201F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_8777A87D18F4182E02C70E25B50A87B9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_A06363B82A05B2E1C9D80E25B50AAA7F" xlink:to="loc_us-gaap_Revenues_8777A87D18F4182E02C70E25B50A87B9" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/SegmentInformationReconciliationOfSegmentOperatingIncomeToConsolidatedIncomeLossBeforeIncomeTaxesDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems" xlink:label="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_262E82767576AF49BFAFFC88841673BA" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable" xlink:label="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_FB1C07079C358FFB3C62FC8884146B64" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_262E82767576AF49BFAFFC88841673BA" xlink:to="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_FB1C07079C358FFB3C62FC8884146B64" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsAxis" xlink:label="loc_srt_ConsolidationItemsAxis_773FF6F2D91104B964B4FC8884140416" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_FB1C07079C358FFB3C62FC8884146B64" xlink:to="loc_srt_ConsolidationItemsAxis_773FF6F2D91104B964B4FC8884140416" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_6B78E294AA89C301FBFEFC888415FEB5_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_773FF6F2D91104B964B4FC8884140416" xlink:to="loc_srt_ConsolidationItemsDomain_6B78E294AA89C301FBFEFC888415FEB5_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_6B78E294AA89C301FBFEFC888415FEB5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_773FF6F2D91104B964B4FC8884140416" xlink:to="loc_srt_ConsolidationItemsDomain_6B78E294AA89C301FBFEFC888415FEB5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingSegmentsMember" xlink:label="loc_us-gaap_OperatingSegmentsMember_02B692029B9DB529C677FC888415FCC8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_6B78E294AA89C301FBFEFC888415FEB5" xlink:to="loc_us-gaap_OperatingSegmentsMember_02B692029B9DB529C677FC888415FCC8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MaterialReconcilingItemsMember" xlink:label="loc_us-gaap_MaterialReconcilingItemsMember_54695ED6269EE7BE9398FC8884151EED" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_6B78E294AA89C301FBFEFC888415FEB5" xlink:to="loc_us-gaap_MaterialReconcilingItemsMember_54695ED6269EE7BE9398FC8884151EED" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_CorporateAndReconcilingItemsMember" xlink:label="loc_uis_CorporateAndReconcilingItemsMember_5C06671C030E0D379722FC8884151F46" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_6B78E294AA89C301FBFEFC888415FEB5" xlink:to="loc_uis_CorporateAndReconcilingItemsMember_5C06671C030E0D379722FC8884151F46" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_1CA8A32150D3AB8C1CFBFC8884167488" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_262E82767576AF49BFAFFC88841673BA" xlink:to="loc_us-gaap_OperatingIncomeLoss_1CA8A32150D3AB8C1CFBFC8884167488" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_F293A6AFA8DF37D8E792FC8884169CFC" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_262E82767576AF49BFAFFC88841673BA" xlink:to="loc_us-gaap_InterestExpense_F293A6AFA8DF37D8E792FC8884169CFC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_97D85866F2FEE48DCE5EFC888416D5CE" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_262E82767576AF49BFAFFC88841673BA" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_97D85866F2FEE48DCE5EFC888416D5CE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCharges" xlink:label="loc_us-gaap_RestructuringCharges_8DB522C8D932D767671AFC8884163455" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_262E82767576AF49BFAFFC88841673BA" xlink:to="loc_us-gaap_RestructuringCharges_8DB522C8D932D767671AFC8884163455" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_6493E87124638386966EFC888416E8AB" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_262E82767576AF49BFAFFC88841673BA" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_6493E87124638386966EFC888416E8AB" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/SegmentInformationRevenuePropertiesAndOutsourcingAssetsByGeographicSegmentDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_82B8DD5600BE2F3A6A830E25B60ABE90" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_E27F9A81BB22D9ADFA740E25B607B5FF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_82B8DD5600BE2F3A6A830E25B60ABE90" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_E27F9A81BB22D9ADFA740E25B607B5FF" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementGeographicalAxis" xlink:label="loc_srt_StatementGeographicalAxis_DD49F0770DCE18E1529E0E25B6073CF3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_E27F9A81BB22D9ADFA740E25B607B5FF" xlink:to="loc_srt_StatementGeographicalAxis_DD49F0770DCE18E1529E0E25B6073CF3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_C38BA627A1298CE73C9A0E25B607AB05_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_DD49F0770DCE18E1529E0E25B6073CF3" xlink:to="loc_srt_SegmentGeographicalDomain_C38BA627A1298CE73C9A0E25B607AB05_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_C38BA627A1298CE73C9A0E25B607AB05" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_DD49F0770DCE18E1529E0E25B6073CF3" xlink:to="loc_srt_SegmentGeographicalDomain_C38BA627A1298CE73C9A0E25B607AB05" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_820FAFDE2348219821BE0E25B6073026" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_C38BA627A1298CE73C9A0E25B607AB05" xlink:to="loc_country_US_820FAFDE2348219821BE0E25B6073026" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_GB" xlink:label="loc_country_GB_7E251DD75013205D80FF0E25B60753DA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_C38BA627A1298CE73C9A0E25B607AB05" xlink:to="loc_country_GB_7E251DD75013205D80FF0E25B60753DA" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_OtherInternationalMember" xlink:label="loc_uis_OtherInternationalMember_A0C71C9B8D19DA8A2A280E25B60AC3F9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_C38BA627A1298CE73C9A0E25B607AB05" xlink:to="loc_uis_OtherInternationalMember_A0C71C9B8D19DA8A2A280E25B60AC3F9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_F59ACE6F87EB111166C80E25B60B5931" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_82B8DD5600BE2F3A6A830E25B60ABE90" xlink:to="loc_us-gaap_Revenues_F59ACE6F87EB111166C80E25B60B5931" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/SegmentInformationSummaryOfOperationsBySegmentDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_9699AD9C861A959D83AF0E25B4BD7E09" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_95383ED7BFC2037829150E25B4B90857" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_9699AD9C861A959D83AF0E25B4BD7E09" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_95383ED7BFC2037829150E25B4B90857" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsAxis" xlink:label="loc_srt_ConsolidationItemsAxis_DE4DA26276EBD59B04CF0E25B4B99593" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_95383ED7BFC2037829150E25B4B90857" xlink:to="loc_srt_ConsolidationItemsAxis_DE4DA26276EBD59B04CF0E25B4B99593" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_68232C0A2A33C426C14E0E25B4BC8C13_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_DE4DA26276EBD59B04CF0E25B4B99593" xlink:to="loc_srt_ConsolidationItemsDomain_68232C0A2A33C426C14E0E25B4BC8C13_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_68232C0A2A33C426C14E0E25B4BC8C13" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_DE4DA26276EBD59B04CF0E25B4B99593" xlink:to="loc_srt_ConsolidationItemsDomain_68232C0A2A33C426C14E0E25B4BC8C13" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IntersegmentEliminationMember" xlink:label="loc_us-gaap_IntersegmentEliminationMember_19FCFE550C8414CE67590E25B4BC95AA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_68232C0A2A33C426C14E0E25B4BC8C13" xlink:to="loc_us-gaap_IntersegmentEliminationMember_19FCFE550C8414CE67590E25B4BC95AA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingSegmentsMember" xlink:label="loc_us-gaap_OperatingSegmentsMember_F94E58D7B9F80325860D0E25B4BD8686" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_68232C0A2A33C426C14E0E25B4BC8C13" xlink:to="loc_us-gaap_OperatingSegmentsMember_F94E58D7B9F80325860D0E25B4BD8686" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CorporateNonSegmentMember" xlink:label="loc_us-gaap_CorporateNonSegmentMember_E83A16160F7962E0D4050E25B4BD4823" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_68232C0A2A33C426C14E0E25B4BC8C13" xlink:to="loc_us-gaap_CorporateNonSegmentMember_E83A16160F7962E0D4050E25B4BD4823" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_97811117C8F6F60A4A660E25B4BDA17A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_95383ED7BFC2037829150E25B4B90857" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_97811117C8F6F60A4A660E25B4BDA17A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_235A31A0A2139304F2690E25B4BDEFB0_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_97811117C8F6F60A4A660E25B4BDA17A" xlink:to="loc_us-gaap_SegmentDomain_235A31A0A2139304F2690E25B4BDEFB0_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_235A31A0A2139304F2690E25B4BDEFB0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_97811117C8F6F60A4A660E25B4BDA17A" xlink:to="loc_us-gaap_SegmentDomain_235A31A0A2139304F2690E25B4BDEFB0" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_ServicesMember" xlink:label="loc_uis_ServicesMember_664C3155B1AC2FF6185F0E25B4BDAC20" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_235A31A0A2139304F2690E25B4BDEFB0" xlink:to="loc_uis_ServicesMember_664C3155B1AC2FF6185F0E25B4BDAC20" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_TechnologyMember" xlink:label="loc_uis_TechnologyMember_C9E4174AD7ABE81DEB4B0E25B4BD0618" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_235A31A0A2139304F2690E25B4BDEFB0" xlink:to="loc_uis_TechnologyMember_C9E4174AD7ABE81DEB4B0E25B4BD0618" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_9B5E5C8AB2BF2AB3C2530E25B4BDED7C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_9699AD9C861A959D83AF0E25B4BD7E09" xlink:to="loc_us-gaap_Revenues_9B5E5C8AB2BF2AB3C2530E25B4BDED7C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_80AC19A87C139C01CA6F0E25B4BDF0AA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_9699AD9C861A959D83AF0E25B4BD7E09" xlink:to="loc_us-gaap_OperatingIncomeLoss_80AC19A87C139C01CA6F0E25B4BDF0AA" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/SegmentInformationTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/StockCompensation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/StockCompensationAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_D066B4C5F0D197826C2F0E25B618CCAF" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_6C20DC44DA7F2C15288B0E25B61859F0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_D066B4C5F0D197826C2F0E25B618CCAF" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_6C20DC44DA7F2C15288B0E25B61859F0" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_FF248516F77CB182650E0E25B618991F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_6C20DC44DA7F2C15288B0E25B61859F0" xlink:to="loc_us-gaap_AwardTypeAxis_FF248516F77CB182650E0E25B618991F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5CFDE8C59B6D6E5B08E80E25B6184F37_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_FF248516F77CB182650E0E25B618991F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5CFDE8C59B6D6E5B08E80E25B6184F37_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5CFDE8C59B6D6E5B08E80E25B6184F37" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_FF248516F77CB182650E0E25B618991F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5CFDE8C59B6D6E5B08E80E25B6184F37" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_59C2BBD767F2B42E509C0E25B618264B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5CFDE8C59B6D6E5B08E80E25B6184F37" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_59C2BBD767F2B42E509C0E25B618264B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_3EAFACBC9DA9173C92350E25B6187DEA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5CFDE8C59B6D6E5B08E80E25B6184F37" xlink:to="loc_us-gaap_EmployeeStockOptionMember_3EAFACBC9DA9173C92350E25B6187DEA" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_PerformanceBasedUnitMember" xlink:label="loc_uis_PerformanceBasedUnitMember_9C367CC7C2351F1B201E0E25B61812FD" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5CFDE8C59B6D6E5B08E80E25B6184F37" xlink:to="loc_uis_PerformanceBasedUnitMember_9C367CC7C2351F1B201E0E25B61812FD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_81D52941356D9B83C77F0E25B618AB1F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_6C20DC44DA7F2C15288B0E25B61859F0" xlink:to="loc_srt_RangeAxis_81D52941356D9B83C77F0E25B618AB1F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_07BB9EB2CD1A7189D0B10E25B618D5F8_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_81D52941356D9B83C77F0E25B618AB1F" xlink:to="loc_srt_RangeMember_07BB9EB2CD1A7189D0B10E25B618D5F8_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_07BB9EB2CD1A7189D0B10E25B618D5F8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_81D52941356D9B83C77F0E25B618AB1F" xlink:to="loc_srt_RangeMember_07BB9EB2CD1A7189D0B10E25B618D5F8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_33E288BD70159B72B2950E25B618A53A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_07BB9EB2CD1A7189D0B10E25B618D5F8" xlink:to="loc_srt_MinimumMember_33E288BD70159B72B2950E25B618A53A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_8CD9CE40006AE7EA63740E25B6186CEA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_07BB9EB2CD1A7189D0B10E25B618D5F8" xlink:to="loc_srt_MaximumMember_8CD9CE40006AE7EA63740E25B6186CEA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_A2773B8437BCB2121D660E25B6185A4B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_D066B4C5F0D197826C2F0E25B618CCAF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_A2773B8437BCB2121D660E25B6185A4B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_125B7F29EC64DE733E390E25B61853F0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_D066B4C5F0D197826C2F0E25B618CCAF" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_125B7F29EC64DE733E390E25B61853F0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_7B00D79920FEB9B7A5620E25B622C2F7" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_D066B4C5F0D197826C2F0E25B618CCAF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_7B00D79920FEB9B7A5620E25B622C2F7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_35C4E3536967B88446B40E25B6232CBC" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_D066B4C5F0D197826C2F0E25B618CCAF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_35C4E3536967B88446B40E25B6232CBC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_CCA761B589B61AAE9BCB0E25B6235B4D" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_D066B4C5F0D197826C2F0E25B618CCAF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_CCA761B589B61AAE9BCB0E25B6235B4D" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesVestingAfterAchievementOfGoals" xlink:label="loc_uis_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesVestingAfterAchievementOfGoals_709A40D8C3DF6363D39C0E25B623A2EB" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_D066B4C5F0D197826C2F0E25B618CCAF" xlink:to="loc_uis_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesVestingAfterAchievementOfGoals_709A40D8C3DF6363D39C0E25B623A2EB" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_uis_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_E8BF70B3285C5190A3F20E25B6237EFF" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_D066B4C5F0D197826C2F0E25B618CCAF" xlink:to="loc_uis_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_E8BF70B3285C5190A3F20E25B6237EFF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_7104609192BAC0993CA90E25B623042B" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_D066B4C5F0D197826C2F0E25B618CCAF" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_7104609192BAC0993CA90E25B623042B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_ADC8B7AA7B99F09E02DB0E25B6247BB8" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_D066B4C5F0D197826C2F0E25B618CCAF" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_ADC8B7AA7B99F09E02DB0E25B6247BB8" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_uis_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_0DCD097A6DE02917C3FD0E25B624334C" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_D066B4C5F0D197826C2F0E25B618CCAF" xlink:to="loc_uis_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_0DCD097A6DE02917C3FD0E25B624334C" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/StockCompensationStockCompensationWeightedAverageAssumptionsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/StockCompensationSummaryOfRestrictedStockUnitActivityDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_88B9AFE2F29C3D19AE0F477A7AA629BD" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_C5E1A64C1E355C072CED477A7AA50B1D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_88B9AFE2F29C3D19AE0F477A7AA629BD" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_C5E1A64C1E355C072CED477A7AA50B1D" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_7A17621A4CAF3590A714477A7AA5EB03" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_C5E1A64C1E355C072CED477A7AA50B1D" xlink:to="loc_us-gaap_AwardTypeAxis_7A17621A4CAF3590A714477A7AA5EB03" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6851A3A127D644A014E1477A7AA53AD4_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_7A17621A4CAF3590A714477A7AA5EB03" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6851A3A127D644A014E1477A7AA53AD4_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6851A3A127D644A014E1477A7AA53AD4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_7A17621A4CAF3590A714477A7AA5EB03" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6851A3A127D644A014E1477A7AA53AD4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_91127AA406D77041FAC6477A7AA68DF8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6851A3A127D644A014E1477A7AA53AD4" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_91127AA406D77041FAC6477A7AA68DF8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_6AE7EFB4785BDDC27888477A7AA6F62C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_88B9AFE2F29C3D19AE0F477A7AA629BD" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_6AE7EFB4785BDDC27888477A7AA6F62C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_F776B0380EE5C320A19C477A7AA6C610" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_6AE7EFB4785BDDC27888477A7AA6F62C" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_F776B0380EE5C320A19C477A7AA6C610" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_D8E0D6E808AD4F4FE75B477A7AA6D057" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_6AE7EFB4785BDDC27888477A7AA6F62C" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_D8E0D6E808AD4F4FE75B477A7AA6D057" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_6377405E9FF19B309A78477A7AA7774C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_6AE7EFB4785BDDC27888477A7AA6F62C" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_6377405E9FF19B309A78477A7AA7774C" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresAndExpirationsInPeriod" xlink:label="loc_uis_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresAndExpirationsInPeriod_99F4D564E5094D5FEDBC477A7AA7848F" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_6AE7EFB4785BDDC27888477A7AA6F62C" xlink:to="loc_uis_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresAndExpirationsInPeriod_99F4D564E5094D5FEDBC477A7AA7848F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_38339FE0DFC624A66CF9477A7AA7BD5F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_88B9AFE2F29C3D19AE0F477A7AA629BD" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_38339FE0DFC624A66CF9477A7AA7BD5F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_EB6B3EC6E84646E94B83477A7AA7DF43" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_38339FE0DFC624A66CF9477A7AA7BD5F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_EB6B3EC6E84646E94B83477A7AA7DF43" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_1FAC8DE3667E856DA5B6477A7AA84574" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_38339FE0DFC624A66CF9477A7AA7BD5F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_1FAC8DE3667E856DA5B6477A7AA84574" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_D42428B7F86A9F31F4BF477A7AA8911A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_38339FE0DFC624A66CF9477A7AA7BD5F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_D42428B7F86A9F31F4BF477A7AA8911A" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsForfeituresandExpirationsWeightedAverageGrantDateFairValue" xlink:label="loc_uis_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsForfeituresandExpirationsWeightedAverageGrantDateFairValue_6B3581195F17A2E1F69447AC4EAE1A02" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_38339FE0DFC624A66CF9477A7AA7BD5F" xlink:to="loc_uis_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsForfeituresandExpirationsWeightedAverageGrantDateFairValue_6B3581195F17A2E1F69447AC4EAE1A02" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/StockCompensationTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/SummaryOfSignificantAccountingPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeLeaseDescriptionLineItems" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_FE7AFCF1CEF8750C1CE10E25B479609D" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeLeaseDescriptionTable" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_E2803A535D652431BAB60E25B4746052" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_FE7AFCF1CEF8750C1CE10E25B479609D" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_E2803A535D652431BAB60E25B4746052" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_3EAF6493A565EE6DEC980E25B47799EC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_E2803A535D652431BAB60E25B4746052" xlink:to="loc_srt_RangeAxis_3EAF6493A565EE6DEC980E25B47799EC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_F263515D56C2A4477AFF0E25B478288E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_3EAF6493A565EE6DEC980E25B47799EC" xlink:to="loc_srt_RangeMember_F263515D56C2A4477AFF0E25B478288E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_F263515D56C2A4477AFF0E25B478288E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_3EAF6493A565EE6DEC980E25B47799EC" xlink:to="loc_srt_RangeMember_F263515D56C2A4477AFF0E25B478288E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_A2F139BCC3D5381E9F3D0E25B47837D7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_F263515D56C2A4477AFF0E25B478288E" xlink:to="loc_srt_MinimumMember_A2F139BCC3D5381E9F3D0E25B47837D7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_72386993265A92F2661F0E25B4793761" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_F263515D56C2A4477AFF0E25B478288E" xlink:to="loc_srt_MaximumMember_72386993265A92F2661F0E25B4793761" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_LesseeOperatingandFinanceLeaseTermofContract" xlink:label="loc_uis_LesseeOperatingandFinanceLeaseTermofContract_CB7017958E15DD05A5C40E25B47995D8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_FE7AFCF1CEF8750C1CE10E25B479609D" xlink:to="loc_uis_LesseeOperatingandFinanceLeaseTermofContract_CB7017958E15DD05A5C40E25B47995D8" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_LesseeOperatingandFinanceLeaseRenewalTerm" xlink:label="loc_uis_LesseeOperatingandFinanceLeaseRenewalTerm_A7C0EC135E5A2A93FCC20E25B47A41A3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_FE7AFCF1CEF8750C1CE10E25B479609D" xlink:to="loc_uis_LesseeOperatingandFinanceLeaseRenewalTerm_A7C0EC135E5A2A93FCC20E25B47A41A3" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_LesseeOperatingandFinanceLeaseOptiontoTerminateTerminationPeriod" xlink:label="loc_uis_LesseeOperatingandFinanceLeaseOptiontoTerminateTerminationPeriod_F7A7A12EE3E3DC514B0B0E25B47AA4FB" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_FE7AFCF1CEF8750C1CE10E25B479609D" xlink:to="loc_uis_LesseeOperatingandFinanceLeaseOptiontoTerminateTerminationPeriod_F7A7A12EE3E3DC514B0B0E25B47AA4FB" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/SummaryOfSignificantAccountingPoliciesComponentsOfLeaseExpenseDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/SummaryOfSignificantAccountingPoliciesMarketableSoftwareDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6F247CAB08893DE057561A1FE98DD898" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_8D32D166EFCAA0F94E8C1A1FE98AC364" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6F247CAB08893DE057561A1FE98DD898" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_8D32D166EFCAA0F94E8C1A1FE98AC364" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_D5D36018F5BD8F9C25751A1FE98B18B3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_8D32D166EFCAA0F94E8C1A1FE98AC364" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_D5D36018F5BD8F9C25751A1FE98B18B3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_11C3CC6AF0780F1D58251A1FE98B8206_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_D5D36018F5BD8F9C25751A1FE98B18B3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_11C3CC6AF0780F1D58251A1FE98B8206_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_11C3CC6AF0780F1D58251A1FE98B8206" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_D5D36018F5BD8F9C25751A1FE98B18B3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_11C3CC6AF0780F1D58251A1FE98B8206" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComputerSoftwareIntangibleAssetMember" xlink:label="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_86138BF54828A29C883C1A1FE98BE513" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_11C3CC6AF0780F1D58251A1FE98B8206" xlink:to="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_86138BF54828A29C883C1A1FE98BE513" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_ComputerSoftwareEnterpriseMember" xlink:label="loc_uis_ComputerSoftwareEnterpriseMember_F8FBD89DAD01C06550331A1FE98BCCB5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_86138BF54828A29C883C1A1FE98BE513" xlink:to="loc_uis_ComputerSoftwareEnterpriseMember_F8FBD89DAD01C06550331A1FE98BCCB5" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_ComputerSoftwareExcludingEnterpriseMember" xlink:label="loc_uis_ComputerSoftwareExcludingEnterpriseMember_96809931518D04E26AA91A1FE98C6C92" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_86138BF54828A29C883C1A1FE98BE513" xlink:to="loc_uis_ComputerSoftwareExcludingEnterpriseMember_96809931518D04E26AA91A1FE98C6C92" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RestatementAxis" xlink:label="loc_srt_RestatementAxis_58861FBBE895C3555E741A1FE98CD19A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_8D32D166EFCAA0F94E8C1A1FE98AC364" xlink:to="loc_srt_RestatementAxis_58861FBBE895C3555E741A1FE98CD19A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RestatementDomain" xlink:label="loc_srt_RestatementDomain_541BAE8A7FEDF08199AB1A1FE98C1E17_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_58861FBBE895C3555E741A1FE98CD19A" xlink:to="loc_srt_RestatementDomain_541BAE8A7FEDF08199AB1A1FE98C1E17_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RestatementDomain" xlink:label="loc_srt_RestatementDomain_541BAE8A7FEDF08199AB1A1FE98C1E17" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_58861FBBE895C3555E741A1FE98CD19A" xlink:to="loc_srt_RestatementDomain_541BAE8A7FEDF08199AB1A1FE98C1E17" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioPreviouslyReportedMember" xlink:label="loc_srt_ScenarioPreviouslyReportedMember_4AC6FFAC973E296873EA1A1FE98C4A81" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_541BAE8A7FEDF08199AB1A1FE98C1E17" xlink:to="loc_srt_ScenarioPreviouslyReportedMember_4AC6FFAC973E296873EA1A1FE98C4A81" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RestatementAdjustmentMember" xlink:label="loc_srt_RestatementAdjustmentMember_9F8052B6E6C2167633EF1A1FE98D1CA1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_541BAE8A7FEDF08199AB1A1FE98C1E17" xlink:to="loc_srt_RestatementAdjustmentMember_9F8052B6E6C2167633EF1A1FE98D1CA1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_31406B0738F2C7BC36C11A1FE98D681F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6F247CAB08893DE057561A1FE98DD898" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_31406B0738F2C7BC36C11A1FE98D681F" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_FiniteLivedIntangibleAssetsTypicalRenewalPeriod" xlink:label="loc_uis_FiniteLivedIntangibleAssetsTypicalRenewalPeriod_9BE12C8EDC6D6982D9AD1A1FE98D445C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6F247CAB08893DE057561A1FE98DD898" xlink:to="loc_uis_FiniteLivedIntangibleAssetsTypicalRenewalPeriod_9BE12C8EDC6D6982D9AD1A1FE98D445C" xlink:type="arc" />
    <link:loc xlink:href="uis-20190630.xsd#uis_FiniteLivedIntangibleAssetsPercentageofTotalComputerSoftwareIntangibleAsset" xlink:label="loc_uis_FiniteLivedIntangibleAssetsPercentageofTotalComputerSoftwareIntangibleAsset_FCFE0C3ED0AD89F23D6C1A1FE98DF148" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6F247CAB08893DE057561A1FE98DD898" xlink:to="loc_uis_FiniteLivedIntangibleAssetsPercentageofTotalComputerSoftwareIntangibleAsset_FCFE0C3ED0AD89F23D6C1A1FE98DF148" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfRevenue" xlink:label="loc_us-gaap_CostOfRevenue_D27E3DC6BD8A7A04DF461A1FE98E037B" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6F247CAB08893DE057561A1FE98DD898" xlink:to="loc_us-gaap_CostOfRevenue_D27E3DC6BD8A7A04DF461A1FE98E037B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_C5EDED38B08DBF2199751A1FE98E31B1" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6F247CAB08893DE057561A1FE98DD898" xlink:to="loc_us-gaap_NetIncomeLoss_C5EDED38B08DBF2199751A1FE98E31B1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_E672F93238CD4CFDC7FA1A1FE98EC301" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6F247CAB08893DE057561A1FE98DD898" xlink:to="loc_us-gaap_EarningsPerShareDiluted_E672F93238CD4CFDC7FA1A1FE98EC301" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_887898EF36E54087AD101A1FE98EDE08" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6F247CAB08893DE057561A1FE98DD898" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_887898EF36E54087AD101A1FE98EDE08" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_09464F3BF94AD7DA91D61A1FE98EE476" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6F247CAB08893DE057561A1FE98DD898" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_09464F3BF94AD7DA91D61A1FE98EE476" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1_791ED0BC7BBE0C8D17361A1FE98EC780" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6F247CAB08893DE057561A1FE98DD898" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1_791ED0BC7BBE0C8D17361A1FE98EC780" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.unisys.com/role/SummaryOfSignificantAccountingPoliciesMaturitiesOfLeaseLiabilitiesTopic840Details" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/SummaryOfSignificantAccountingPoliciesMaturitiesOfLeaseLiabilitiesTopic842Details" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/SummaryOfSignificantAccountingPoliciesReceivablesUnderSalesTypeLeaseDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/SummaryOfSignificantAccountingPoliciesSupplementalBalanceSheetInformationDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/SummaryOfSignificantAccountingPoliciesSupplementalCashFlowInformationDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/SummaryOfSignificantAccountingPoliciesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/SupplementalCashFlowInformation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/SupplementalCashFlowInformationReconciliationOfCashCashEquivalentsAndRestrictedCashDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/SupplementalCashFlowInformationScheduleOfSupplementalCashFlowInformationDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.unisys.com/role/SupplementalCashFlowInformationTables" xlink:type="extended" />
</link:linkbase>
