<?xml version="1.0" encoding="us-ascii"?>
<!-- DFS ActiveDisclosure(SM) XBRL Schema Document - http://www.dfsco.com/financial-services/ -->
<!-- Creation Date      : 2018-08-18T02:45:55.9172508+00:00 -->
<!-- Version            : 2.12.6766.32775 -->
<!-- Package ID         : 74039c36e7234840a87a53237d98298b -->
<!-- Copyright (c) 2018 Donnelley Financial, LLC. All Rights Reserved. -->
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  <element id="caci_TaxCutsAndJobsActOf2017IncompleteAccountingTransitionTaxForAccumulatedForeignEarningsProvisionalIncomeTaxExpense" name="TaxCutsAndJobsActOf2017IncompleteAccountingTransitionTaxForAccumulatedForeignEarningsProvisionalIncomeTaxExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
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  <element id="caci_TCJAOverallImpactOnResultsOfOperations" name="TCJAOverallImpactOnResultsOfOperations" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="caci_TCJAOverallImpactOnDilutedEarningsPerShare" name="TCJAOverallImpactOnDilutedEarningsPerShare" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="caci_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterest" name="IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterest" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
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  <element id="caci_FourZeroOneKProfitSharingPlanMember" name="FourZeroOneKProfitSharingPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
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  <element id="caci_EmployerContributionPercentage" name="EmployerContributionPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
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  <element id="caci_SupplementalSavingsPlanParticipantCompensationDeferral" name="SupplementalSavingsPlanParticipantCompensationDeferral" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="caci_SupplementalSavingsPlanCOLIGains" name="SupplementalSavingsPlanCOLIGains" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
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  <element id="caci_TwoThousandSixteenIncentiveCompensationPlanMember" name="TwoThousandSixteenIncentiveCompensationPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
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  <element id="caci_CumulativeEquityInstrumentsForfeited" name="CumulativeEquityInstrumentsForfeited" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <element id="caci_AverageSharePricePerformanceConditionPercentage" name="AverageSharePricePerformanceConditionPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="caci_AverageSharePriceDeterminationPeriod" name="AverageSharePriceDeterminationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="caci_PercentageOfEarnedAwardVestingAfterThreeYears" name="PercentageOfEarnedAwardVestingAfterThreeYears" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="caci_PercentageOfEarnedAwardVestingAfterFourYears" name="PercentageOfEarnedAwardVestingAfterFourYears" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="caci_MaximumEarnedAwardPercentageOfTarget" name="MaximumEarnedAwardPercentageOfTarget" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="caci_AdditionalPerformanceBasedRestrictedStockUnitsEarnedPursuantToCondition" name="AdditionalPerformanceBasedRestrictedStockUnitsEarnedPursuantToCondition" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="caci_StockSettledStockAppreciationRightsAndStockOptionsMember" name="StockSettledStockAppreciationRightsAndStockOptionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
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  <element id="caci_ManagementStockPurchasePlanMember" name="ManagementStockPurchasePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="caci_DirectorStockPurchasePlanMember" name="DirectorStockPurchasePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="caci_ExercisePriceThirtySevenPointSixSevenToFortyNinePointThreeSixMember" name="ExercisePriceThirtySevenPointSixSevenToFortyNinePointThreeSixMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="caci_ExercisePriceFortyEightPointEightThreeMember" name="ExercisePriceFortyEightPointEightThreeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
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  <element id="caci_ShareBasedCompensationNumberOfShareAuthorizedToBePurchasedByEligibleEmployee" name="ShareBasedCompensationNumberOfShareAuthorizedToBePurchasedByEligibleEmployee" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
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  <element id="caci_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockIssuedInLieuOfPercentageOfAnnualBonus" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockIssuedInLieuOfPercentageOfAnnualBonus" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
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  <element id="caci_SystemsEngineeringAndAcquisitionSupportServicesBusinessMember" name="SystemsEngineeringAndAcquisitionSupportServicesBusinessMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
</schema>
