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<!-- Generated by DFIN XBRL Schema Document - http://www.dfinsolutions.com/ - on 26-06-2026 11:36:26 AM -->
<!-- Copyright(c) 2026 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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	<import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd"/>   
	<import namespace="http://xbrl.sec.gov/country/2025" schemaLocation="https://xbrl.sec.gov/country/2025/country-2025.xsd"/>
	<import namespace="http://fasb.org/srt/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd"/>
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	<import namespace="http://xbrl.sec.gov/oef-sr/2025" schemaLocation="https://xbrl.sec.gov/oef/2025/oef-sr-2025.xsd"/>
	<import namespace="http://fasb.org/us-gaap/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd"/>
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				<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ShareholderReportHoldingsDetails"/>
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				<link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd#eedm"/>
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					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ExchangeTradedFundsMember" xlink:label="ExchangeTradedFundsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="ExchangeTradedFundsMember" order="2.0"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USTreasuryBillSecuritiesMember" xlink:label="USTreasuryBillSecuritiesMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="USTreasuryBillSecuritiesMember" order="3.0"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember" xlink:label="USGovernmentCorporationsAndAgenciesSecuritiesMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="USGovernmentCorporationsAndAgenciesSecuritiesMember" order="4.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_NetOtherAssetsAndLiabilitiesMember" xlink:label="NetOtherAssetsAndLiabilitiesMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="NetOtherAssetsAndLiabilitiesMember" order="5.0"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgageBackedSecuritiesMember" xlink:label="MortgageBackedSecuritiesMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="MortgageBackedSecuritiesMember" order="6.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_USGovernmentAgencyMortgageBackedSecuritiesMember" xlink:label="USGovernmentAgencyMortgageBackedSecuritiesMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="USGovernmentAgencyMortgageBackedSecuritiesMember" order="7.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_USGovernmentBondsAndNotesMember" xlink:label="USGovernmentBondsAndNotesMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="USGovernmentBondsAndNotesMember" order="8.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_USGovernmentAgencyMortgageBackedSecuritiesSoldShortMember" xlink:label="USGovernmentAgencyMortgageBackedSecuritiesSoldShortMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="USGovernmentAgencyMortgageBackedSecuritiesSoldShortMember" order="9.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_WrittenOptionsMember" xlink:label="WrittenOptionsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="WrittenOptionsMember" order="10.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_GovernmentAndAgencyMember" xlink:label="GovernmentAndAgencyMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="GovernmentAndAgencyMember" order="11.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_ShortGovernmentAndAgencyMember" xlink:label="ShortGovernmentAndAgencyMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="ShortGovernmentAndAgencyMember" order="12.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_PurchasedOptionsMember" xlink:label="PurchasedOptionsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="PurchasedOptionsMember" order="13.0"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/BroadBasedIndexOnly">               
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_BroadBasedIndexDomain" xlink:label="BroadBasedIndexDomain"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/AdditionalIndexOnly">              
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_AdditionalIndexDomain" xlink:label="AdditionalIndexDomain"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/MaturityOnly">
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_MaturityDomain" xlink:label="MaturityDomain"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/IndustrySectorOnly">
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_IndustrySectorDomain" xlink:label="IndustrySectorDomain"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_MultiUtilitiesMember" xlink:label="MultiUtilitiesMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="MultiUtilitiesMember" order="1.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_ElectricUtilitiesMember" xlink:label="ElectricUtilitiesMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="ElectricUtilitiesMember" order="2.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_MachineryMember" xlink:label="MachineryMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="MachineryMember" order="3.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_ConstructionAndEngineeringMember" xlink:label="ConstructionAndEngineeringMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="ConstructionAndEngineeringMember" order="4.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_ElectricalEquipmentMember" xlink:label="ElectricalEquipmentMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="ElectricalEquipmentMember" order="5.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_GasUtilitiesMember" xlink:label="GasUtilitiesMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="GasUtilitiesMember" order="6.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_OilGasAndConsumableFuelsMember" xlink:label="OilGasAndConsumableFuelsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="OilGasAndConsumableFuelsMember" order="7.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_InsuranceMember" xlink:label="InsuranceMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="InsuranceMember" order="8.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_SoftwareMember" xlink:label="SoftwareMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="SoftwareMember" order="9.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_HotelsRestaurantsAndLeisureMember" xlink:label="HotelsRestaurantsAndLeisureMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="HotelsRestaurantsAndLeisureMember" order="10.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_HealthCareProvidersAndServicesMember" xlink:label="HealthCareProvidersAndServicesMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="HealthCareProvidersAndServicesMember" order="11.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_MediaMember" xlink:label="MediaMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="MediaMember" order="12.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_CommercialServicesAndSuppliesMember" xlink:label="CommercialServicesAndSuppliesMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="CommercialServicesAndSuppliesMember" order="13.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_TradingCompaniesAndDistributorsMember" xlink:label="TradingCompaniesAndDistributorsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="TradingCompaniesAndDistributorsMember" order="14.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_BuildingProductsMember" xlink:label="BuildingProductsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="BuildingProductsMember" order="15.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_IndependentPowerAndRenewableElectricityProductsMember" xlink:label="IndependentPowerAndRenewableElectricityProductsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="IndependentPowerAndRenewableElectricityProductsMember" order="16.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_MoneyMarketFundsSectorMember" xlink:label="MoneyMarketFundsSectorMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="MoneyMarketFundsSectorMember" order="17.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_IndependentPowerAndRenewableElectricityProducersMember" xlink:label="IndependentPowerAndRenewableElectricityProducersMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="IndependentPowerAndRenewableElectricityProducersMember" order="18.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_EnergyEquipmentAndServicesMember" xlink:label="EnergyEquipmentAndServicesMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="EnergyEquipmentAndServicesMember" order="19.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_USTreasuryBillSecuritiesSectorMember" xlink:label="USTreasuryBillSecuritiesSectorMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="USTreasuryBillSecuritiesSectorMember" order="20.0"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/CreditQualityOnly">
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_CreditQualityDomain" xlink:label="CreditQualityDomain"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_MoneyMarketFundsQualityMember" xlink:label="MoneyMarketFundsQualityMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CreditQualityDomain" xlink:to="MoneyMarketFundsQualityMember" order="1.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_NRMember" xlink:label="NRMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CreditQualityDomain" xlink:to="NRMember" order="2.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_A1ShortTermMember" xlink:label="A1ShortTermMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CreditQualityDomain" xlink:to="A1ShortTermMember" order="3.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_ExchangeTradedFundsQualityMember" xlink:label="ExchangeTradedFundsQualityMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CreditQualityDomain" xlink:to="ExchangeTradedFundsQualityMember" order="4.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_A3Member" xlink:label="A3Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CreditQualityDomain" xlink:to="A3Member" order="5.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_A2Member" xlink:label="A2Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CreditQualityDomain" xlink:to="A2Member" order="6.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_A2ShortTermMember" xlink:label="A2ShortTermMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CreditQualityDomain" xlink:to="A2ShortTermMember" order="7.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_A3ShortTermMember" xlink:label="A3ShortTermMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CreditQualityDomain" xlink:to="A3ShortTermMember" order="8.0"/>
				</link:definitionLink>
				<!--GeographicRegionOnly use only for STPR-->
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/GeographicRegionOnly">
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_GeographicRegionDomain" xlink:label="GeographicRegionDomain"/>
				</link:definitionLink>
				<link:labelLink xlink:type="extended" xlink:role="http://www.xbrl.org/2003/role/link">               
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MoneyMarketFundsMember" xlink:label="MoneyMarketFundsMember"/>
					<link:label xlink:type="resource" xlink:label="label_MoneyMarketFundsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Money Market Funds [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MoneyMarketFundsMember" xlink:to="label_MoneyMarketFundsMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StandardPoorsBBBRatingMember" xlink:label="StandardPoorsBBBRatingMember"/>
					<link:label xlink:type="resource" xlink:label="label_StandardPoorsBBBRatingMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Standard &amp; Poor&apos;s, BBB Rating [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="StandardPoorsBBBRatingMember" xlink:to="label_StandardPoorsBBBRatingMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StandardPoorsBBRatingMember" xlink:label="StandardPoorsBBRatingMember"/>
					<link:label xlink:type="resource" xlink:label="label_StandardPoorsBBRatingMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Standard &amp; Poor&apos;s, BB Rating [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="StandardPoorsBBRatingMember" xlink:to="label_StandardPoorsBBRatingMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StandardPoorsBRatingMember" xlink:label="StandardPoorsBRatingMember"/>
					<link:label xlink:type="resource" xlink:label="label_StandardPoorsBRatingMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Standard &amp; Poor&apos;s, B Rating [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="StandardPoorsBRatingMember" xlink:to="label_StandardPoorsBRatingMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StandardPoorsCCCRatingMember" xlink:label="StandardPoorsCCCRatingMember"/>
					<link:label xlink:type="resource" xlink:label="label_StandardPoorsCCCRatingMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Standard &amp; Poor&apos;s, CCC Rating [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="StandardPoorsCCCRatingMember" xlink:to="label_StandardPoorsCCCRatingMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ExchangeTradedFundsMember" xlink:label="ExchangeTradedFundsMember"/>
					<link:label xlink:type="resource" xlink:label="label_ExchangeTradedFundsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Exchange Traded Funds [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ExchangeTradedFundsMember" xlink:to="label_ExchangeTradedFundsMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StandardPoorsAAARatingMember" xlink:label="StandardPoorsAAARatingMember"/>
					<link:label xlink:type="resource" xlink:label="label_StandardPoorsAAARatingMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Standard &amp; Poor&apos;s, AAA Rating [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="StandardPoorsAAARatingMember" xlink:to="label_StandardPoorsAAARatingMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StandardPoorsAARatingMember" xlink:label="StandardPoorsAARatingMember"/>
					<link:label xlink:type="resource" xlink:label="label_StandardPoorsAARatingMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Standard &amp; Poor&apos;s, AA Rating [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="StandardPoorsAARatingMember" xlink:to="label_StandardPoorsAARatingMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StandardPoorsARatingMember" xlink:label="StandardPoorsARatingMember"/>
					<link:label xlink:type="resource" xlink:label="label_StandardPoorsARatingMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Standard &amp; Poor&apos;s, A Rating [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="StandardPoorsARatingMember" xlink:to="label_StandardPoorsARatingMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USTreasuryBillSecuritiesMember" xlink:label="USTreasuryBillSecuritiesMember"/>
					<link:label xlink:type="resource" xlink:label="label_USTreasuryBillSecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">US Treasury Bill Securities [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="USTreasuryBillSecuritiesMember" xlink:to="label_USTreasuryBillSecuritiesMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember" xlink:label="USGovernmentCorporationsAndAgenciesSecuritiesMember"/>
					<link:label xlink:type="resource" xlink:label="label_USGovernmentCorporationsAndAgenciesSecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">US Government Corporations and Agencies Securities [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="USGovernmentCorporationsAndAgenciesSecuritiesMember" xlink:to="label_USGovernmentCorporationsAndAgenciesSecuritiesMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_EnterpriseProductsPartnersLPMember" xlink:label="EnterpriseProductsPartnersLPMember"/>
					<link:label xlink:type="resource" xlink:label="label_EnterpriseProductsPartnersLPMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Enterprise Products Partners L P [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EnterpriseProductsPartnersLPMember" xlink:to="label_EnterpriseProductsPartnersLPMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_MultiUtilitiesMember" xlink:label="MultiUtilitiesMember"/>
					<link:label xlink:type="resource" xlink:label="label_MultiUtilitiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Multi Utilities [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MultiUtilitiesMember" xlink:to="label_MultiUtilitiesMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_EntergyCorpMember" xlink:label="EntergyCorpMember"/>
					<link:label xlink:type="resource" xlink:label="label_EntergyCorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Entergy Corp [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EntergyCorpMember" xlink:to="label_EntergyCorpMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_ElectricUtilitiesMember" xlink:label="ElectricUtilitiesMember"/>
					<link:label xlink:type="resource" xlink:label="label_ElectricUtilitiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Electric Utilities [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ElectricUtilitiesMember" xlink:to="label_ElectricUtilitiesMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_PPLCorpMember" xlink:label="PPLCorpMember"/>
					<link:label xlink:type="resource" xlink:label="label_PPLCorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">PPL Corp [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="PPLCorpMember" xlink:to="label_PPLCorpMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_SouthernTheCoMember" xlink:label="SouthernTheCoMember"/>
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					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SouthernTheCoMember" xlink:to="label_SouthernTheCoMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_NationalFuelGasCoMember" xlink:label="NationalFuelGasCoMember"/>
					<link:label xlink:type="resource" xlink:label="label_NationalFuelGasCoMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">National Fuel Gas Co [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="NationalFuelGasCoMember" xlink:to="label_NationalFuelGasCoMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_KinderMorganIncMember" xlink:label="KinderMorganIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_KinderMorganIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Kinder Morgan Inc [Member]</link:label>
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					<link:loc xlink:type="locator" xlink:href="#ftetfiv_PlainsGPHoldingsLPClassAMember" xlink:label="PlainsGPHoldingsLPClassAMember"/>
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					<link:loc xlink:type="locator" xlink:href="#ftetfiv_MPLXLPMember" xlink:label="MPLXLPMember"/>
					<link:label xlink:type="resource" xlink:label="label_MPLXLPMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">MPLX L P [Member]</link:label>
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					<link:loc xlink:type="locator" xlink:href="#ftetfiv_MorganStanleyInstitutionalLiquidityFundsTreasuryPortfolioInstitutionalClassMember" xlink:label="MorganStanleyInstitutionalLiquidityFundsTreasuryPortfolioInstitutionalClassMember"/>
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					<link:loc xlink:type="locator" xlink:href="#ftetfiv_EnergyTransferLPMember" xlink:label="EnergyTransferLPMember"/>
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					<link:loc xlink:type="locator" xlink:href="#ftetfiv_MachineryMember" xlink:label="MachineryMember"/>
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					<link:label xlink:type="resource" xlink:label="label_ConstructionAndEngineeringMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Construction And Engineering [Member]</link:label>
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					<link:loc xlink:type="locator" xlink:href="#ftetfiv_GasUtilitiesMember" xlink:label="GasUtilitiesMember"/>
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										<link:label xlink:type="resource" xlink:label="label_C000102880Member_2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Class Composite</link:label>
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					<link:loc xlink:type="locator" xlink:href="#ftetfiv_InsuranceMember" xlink:label="InsuranceMember"/>
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					<link:loc xlink:type="locator" xlink:href="#ftetfiv_BuildingProductsMember" xlink:label="BuildingProductsMember"/>
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					<link:loc xlink:type="locator" xlink:href="#ftetfiv_DukeEnergyCorpMember" xlink:label="DukeEnergyCorpMember"/>
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	<element name="C000256817Member" id="ftetfiv_C000256817Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000257988Member" id="ftetfiv_C000257988Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
</schema>
