<?xml version="1.0" encoding="us-ascii"?>
<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2019-05-08T17:20:52.1311873+00:00 -->
<!-- Version            : 3.4.7044.22220 -->
<!-- Package ID         : c0bef737668a43e4bc834e9107504dc3 -->
<!-- Copyright (c) 2019 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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  <xsd:element id="ngls_TargaResourcesCorpTargaResourcePartnersMember" name="TargaResourcesCorpTargaResourcePartnersMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_HoldersOfLimitedPartnerInterestsMember" name="HoldersOfLimitedPartnerInterestsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_TargaResourcesGPLLCMember" name="TargaResourcesGPLLCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_PreferredStockBasisSpreadOnVariableRateUponMaturity" name="PreferredStockBasisSpreadOnVariableRateUponMaturity" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ngls_DistributionMadeToLimitedPartnerCashDistributionsDeclaredPerShare" name="DistributionMadeToLimitedPartnerCashDistributionsDeclaredPerShare" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ngls_DerivativeExpirationYearAxis" name="DerivativeExpirationYearAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_DerivativeExpirationYearDomain" name="DerivativeExpirationYearDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_YearOneMember" name="YearOneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_YearTwoMember" name="YearTwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_YearThreeMember" name="YearThreeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_YearFourMember" name="YearFourMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_YearFiveMember" name="YearFiveMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_CondensateMember" name="CondensateMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_DerivativeAssetBeforeEffectsOfMasterNettingArrangements" name="DerivativeAssetBeforeEffectsOfMasterNettingArrangements" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="ngls_DerivativeLiabilityBeforeEffectsOfMasterNettingArrangements" name="DerivativeLiabilityBeforeEffectsOfMasterNettingArrangements" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="ngls_CounterpartiesWithOffsettingPositionOrCollateralMember" name="CounterpartiesWithOffsettingPositionOrCollateralMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_CounterpartiesWithoutOffsettingPositionMember" name="CounterpartiesWithoutOffsettingPositionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_DerivativeCollateralObligationRightToReturnReclaimSecurities" name="DerivativeCollateralObligationRightToReturnReclaimSecurities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="ngls_PriceRiskCashFlowHedgeGainLossExpectedToReclassifyIntoEarnings" name="PriceRiskCashFlowHedgeGainLossExpectedToReclassifyIntoEarnings" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="ngls_DerivativeFairValueOfAssetLiabilityNetIfCommodityPriceIncreasesBy10Percent" name="DerivativeFairValueOfAssetLiabilityNetIfCommodityPriceIncreasesBy10Percent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="ngls_DerivativeFairValueOfAssetLiabilityNetIfCommodityPriceDecreasesBy10Percent" name="DerivativeFairValueOfAssetLiabilityNetIfCommodityPriceDecreasesBy10Percent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="ngls_FinancialInstrumentsRecordedOnOurConsolidatedBalanceSheetsAtFairValueAbstract" name="FinancialInstrumentsRecordedOnOurConsolidatedBalanceSheetsAtFairValueAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_FinancialInstrumentsRecordedOnOurConsolidatedBalanceSheetsAtCarryingValueAbstract" name="FinancialInstrumentsRecordedOnOurConsolidatedBalanceSheetsAtCarryingValueAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_NumberOfNaturalGasBasisSwapsCategorizedAsLevel3" name="NumberOfNaturalGasBasisSwapsCategorizedAsLevel3" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="ngls_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsLiabilityGainLoss" name="FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsLiabilityGainLoss" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="ngls_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityChangeInValuationOfContingentConsideration" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityChangeInValuationOfContingentConsideration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="ngls_RelatedPartyTransactionPayrollAndRelatedCostsIncludedInOperatingExpenseFromTransactionsWithRelatedParty" name="RelatedPartyTransactionPayrollAndRelatedCostsIncludedInOperatingExpenseFromTransactionsWithRelatedParty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="ngls_GeneralPartnersCapitalAccountContributedAmount" name="GeneralPartnersCapitalAccountContributedAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="ngls_SummaryOfTransactionsWithAffiliatesAbstract" name="SummaryOfTransactionsWithAffiliatesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_EnvironmentProceedingMember" name="EnvironmentProceedingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_ComplianceImprovementsMember" name="ComplianceImprovementsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_NonCashAdjustmentToLineFill" name="NonCashAdjustmentToLineFill" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="ngls_ImpactOfCapitalExpenditureAccrualsOnPropertyPlantAndEquipment" name="ImpactOfCapitalExpenditureAccrualsOnPropertyPlantAndEquipment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="ngls_TransfersFromMaterialsAndSuppliesToPropertyPlantAndEquipment" name="TransfersFromMaterialsAndSuppliesToPropertyPlantAndEquipment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="ngls_ContributionOfPropertyPlantAndEquipmentToInvestmentInUnconsolidatedAffiliates" name="ContributionOfPropertyPlantAndEquipmentToInvestmentInUnconsolidatedAffiliates" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="ngls_NoncashNoncontrollingInterestIncreaseFromBusinessCombination" name="NoncashNoncontrollingInterestIncreaseFromBusinessCombination" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="ngls_CashAbstract" name="CashAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_NonCashInvestingActivitiesAbstract" name="NonCashInvestingActivitiesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_NonCashBalanceSheetMovementsRelatedToAcquisitionOfRelatedPartyAbstract" name="NonCashBalanceSheetMovementsRelatedToAcquisitionOfRelatedPartyAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_LeaseLiabilitiesArisingFromRecognitionOfRightOfUseAssetsAbstract" name="LeaseLiabilitiesArisingFromRecognitionOfRightOfUseAssetsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_GatheringAndProcessingMember" name="GatheringAndProcessingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_LogisticsAndMarketingMember" name="LogisticsAndMarketingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_CorporateNonSegmentAndIntersegmentEliminationMember" name="CorporateNonSegmentAndIntersegmentEliminationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_RevenueNotFromContractWithCustomer" name="RevenueNotFromContractWithCustomer" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="ngls_NaturalGasSalesMember" name="NaturalGasSalesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_NglSalesMember" name="NglSalesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_CondensateAndCrudeOilSalesMember" name="CondensateAndCrudeOilSalesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_PetroleumProductsMember" name="PetroleumProductsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_NGLTransportationAndServicesMember" name="NGLTransportationAndServicesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_StorageTerminalingAndExportFeesMember" name="StorageTerminalingAndExportFeesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ngls_MidstreamServicesOtherMember" name="MidstreamServicesOtherMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
</xsd:schema>
