<?xml version="1.0" encoding="US-ASCII"?>
<!-- Generated by DFIN XBRL Schema Document - http://www.dfinsolutions.com/ - on 27-09-2026 09:08:57 PM -->
<!-- Copyright(c) 2026 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
<schema targetNamespace="http://www.ftportfolios.com/20260925" xmlns="http://www.w3.org/2001/XMLSchema" xmlns:ftetfiv="http://www.ftportfolios.com/20260925" xmlns:dei="http://xbrl.sec.gov/dei/2025" xmlns:srt-types="http://fasb.org/srt-types/2025" xmlns:deprecated="http://www.xbrl.org/2009/role/deprecated" xmlns:dtr="http://www.xbrl.org/2009/dtr" xmlns:oef="http://xbrl.sec.gov/oef/2025" xmlns:ref="http://www.xbrl.org/2006/ref" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xl="http://www.xbrl.org/2003/XLink" xmlns:us-gaap="http://fasb.org/us-gaap/2025" xmlns:oef-pre="http://xbrl.sec.gov/oef-pre/2025" xmlns:oef-lab="http://xbrl.sec.gov/oef-lab/2025" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:country="http://xbrl.sec.gov/country/2025" xmlns:us-roles="http://fasb.org/us-roles/2025" xmlns:enum2="http://xbrl.org/2020/extensible-enumerations-2.0" xmlns:us-types="http://fasb.org/us-types/2025" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2024-01-31" xmlns:oef-def="http://xbrl.sec.gov/oef-def/2025" xmlns:negated="http://www.xbrl.org/2009/role/negated" xmlns:xbrldi="http://xbrl.org/2006/xbrldi" xmlns:srt="http://fasb.org/srt/2025" xmlns:oef-sr="http://xbrl.sec.gov/oef-sr/2025" xmlns:srt-roles="http://fasb.org/srt-roles/2025" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:stpr="http://xbrl.sec.gov/stpr/2025" elementFormDefault="qualified">
	<import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
	<import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
	<import namespace="http://xbrl.sec.gov/dei/2025" schemaLocation="https://xbrl.sec.gov/dei/2025/dei-2025.xsd"/>
	<import namespace="http://fasb.org/us-types/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-types-2025.xsd"/>
	<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"/>
	<import namespace="http://fasb.org/srt-types/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-types-2025.xsd"/>
	<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"/>
	<import namespace="http://fasb.org/us-roles/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd"/>
	<import namespace="http://fasb.org/srt-roles/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-roles-2025.xsd"/>
	<annotation>
		<appinfo>
			<link:linkbase id="lnk">
				<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
				<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/ShareholderReport" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ShareholderReport"/>
				<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"/>
				<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ShareholderReportLineGraphDetails"/>
				<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ShareholderReportAverageAnnualReturnDetails"/>
				<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/ClassOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ClassOnly"/>
				<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"/>
				<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/LargestHoldingOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#LargestHoldingOnly"/>
				<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/Other1CategoryOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#Other1CategoryOnly"/>
				<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/AdditionalIndexOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#AdditionalIndexOnly"/>
				<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/BroadBasedIndexOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#BroadBasedIndexOnly"/>
				<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/Other2CategoryOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#Other2CategoryOnly"/>
				<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/SalesLoadOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#SalesLoadOnly"/>
				<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/MaturityOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#MaturityOnly"/>
				<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/IndustrySectorOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#IndustrySectorOnly"/>
				<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/CreditQualityOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#CreditQualityOnly"/>
				<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/GeographicRegionOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#GeographicRegionOnly"/>
				<link:presentationLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/ShareholderReport">              
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ShareClassDomain" xlink:label="ShareClassDomain"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_C000246109Member" xlink:label="C000246109Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000246109Member" order="2.0" />
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_C000248162Member" xlink:label="C000248162Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000248162Member" order="3.0" />
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_C000248350Member" xlink:label="C000248350Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000248350Member" order="4.0" />
				</link:presentationLink>
				<link:presentationLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails">               
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ShareClassDomain" xlink:label="ShareClassDomain"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_C000246109Member" xlink:label="C000246109Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000246109Member" order="2.0" />
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_C000248162Member" xlink:label="C000248162Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000248162Member" order="3.0" />
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_C000248350Member" xlink:label="C000248350Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000248350Member" order="4.0" />   
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="InvestmentTypeCategorizationMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_GovernmentAndAgencyMember" xlink:label="GovernmentAndAgencyMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="GovernmentAndAgencyMember" order="2.0" />
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_ShortGovernmentAgencyMember" xlink:label="ShortGovernmentAgencyMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="ShortGovernmentAgencyMember" order="3.0" />
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_NetOtherAssetsAndLiabilitiesMember" xlink:label="NetOtherAssetsAndLiabilitiesMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="NetOtherAssetsAndLiabilitiesMember" order="4.0" />
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_WrittenOptionsMember" xlink:label="WrittenOptionsMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="WrittenOptionsMember" order="5.0" />
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_USGovernmentAgencyMortgageBackedSecuritiesSoldShortMember" xlink:label="USGovernmentAgencyMortgageBackedSecuritiesSoldShortMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="USGovernmentAgencyMortgageBackedSecuritiesSoldShortMember" order="6.0" />
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_PurchasedOptionsMember" xlink:label="PurchasedOptionsMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="PurchasedOptionsMember" order="7.0" />
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_ForeignCorporateBondsAndNotesMember" xlink:label="ForeignCorporateBondsAndNotesMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="ForeignCorporateBondsAndNotesMember" order="8.0" />
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_USGovernmentBondsAndNotesMember" xlink:label="USGovernmentBondsAndNotesMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="USGovernmentBondsAndNotesMember" order="9.0" />
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_CorporateBondsAndNotesMember" xlink:label="CorporateBondsAndNotesMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="CorporateBondsAndNotesMember" order="10.0" />
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_USGovernmentAgencyMortgageBackedSecuritiesMember" xlink:label="USGovernmentAgencyMortgageBackedSecuritiesMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="USGovernmentAgencyMortgageBackedSecuritiesMember" order="11.0" />
					<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:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="MortgageBackedSecuritiesMember" order="12.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember" xlink:label="AssetBackedSecuritiesMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="AssetBackedSecuritiesMember" order="13.0" />
					<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:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="USGovernmentCorporationsAndAgenciesSecuritiesMember" order="14.0" />
					<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:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="ExchangeTradedFundsMember" order="15.0" />
					<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:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="MoneyMarketFundsMember" order="16.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MunicipalBondsMember" xlink:label="MunicipalBondsMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="MunicipalBondsMember" order="17.0" />
					<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:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="USTreasuryBillSecuritiesMember" order="18.0" />
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_ShortGovernmentAndAgencyMember" xlink:label="ShortGovernmentAndAgencyMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="InvestmentTypeCategorizationMember" xlink:to="ShortGovernmentAndAgencyMember" order="19.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_MaturityDomain" xlink:label="MaturityDomain"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_OtherCategory1Domain" xlink:label="OtherCategory1Domain"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_OtherCategory2Domain" xlink:label="OtherCategory2Domain"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_LargestHoldingsDomain" xlink:label="LargestHoldingsDomain"/>
					<!--GeographicRegionDomain Only presentation and label linkbases-->			 
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_GeographicRegionDomain" xlink:label="GeographicRegionDomain"/>
					<!--IndustrySectorDomain Only presentation and label linkbases-->	
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_IndustrySectorDomain" xlink:label="IndustrySectorDomain"/>	
					<!--CreditQualityDomain Only presentation and label linkbases-->	
					<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:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CreditQualityDomain" xlink:to="MoneyMarketFundsQualityMember" order="2.0" />
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_NRMember" xlink:label="NRMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CreditQualityDomain" xlink:to="NRMember" order="3.0" />
					<!--ExternalCreditRatingFitchMember Only presentation and label linkbases-->	
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ExternalCreditRatingFitchMember" xlink:label="ExternalCreditRatingFitchMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CreditQualityDomain" xlink:to="ExternalCreditRatingFitchMember" xbrldt:usable="false" order="1.0"/>
					<!--ExternalCreditRatingMoodysMember Only presentation and label linkbases-->	
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ExternalCreditRatingMoodysMember" xlink:label="ExternalCreditRatingMoodysMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CreditQualityDomain" xlink:to="ExternalCreditRatingMoodysMember" xbrldt:usable="false" order="2.1"/>
					<!--ExternalCreditRatingStandardPoorsMember Only presentation and label linkbases-->	
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ExternalCreditRatingStandardPoorsMember" xlink:label="ExternalCreditRatingStandardPoorsMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CreditQualityDomain" xlink:to="ExternalCreditRatingStandardPoorsMember" xbrldt:usable="false" order="3.1"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StandardPoorsBBBRatingMember" xlink:label="StandardPoorsBBBRatingMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ExternalCreditRatingStandardPoorsMember" xlink:to="StandardPoorsBBBRatingMember" order="1.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StandardPoorsARatingMember" xlink:label="StandardPoorsARatingMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ExternalCreditRatingStandardPoorsMember" xlink:to="StandardPoorsARatingMember" order="2.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StandardPoorsAARatingMember" xlink:label="StandardPoorsAARatingMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ExternalCreditRatingStandardPoorsMember" xlink:to="StandardPoorsAARatingMember" order="3.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StandardPoorsAAARatingMember" xlink:label="StandardPoorsAAARatingMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ExternalCreditRatingStandardPoorsMember" xlink:to="StandardPoorsAAARatingMember" order="4.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StandardPoorsBRatingMember" xlink:label="StandardPoorsBRatingMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ExternalCreditRatingStandardPoorsMember" xlink:to="StandardPoorsBRatingMember" order="5.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StandardPoorsBBRatingMember" xlink:label="StandardPoorsBBRatingMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ExternalCreditRatingStandardPoorsMember" xlink:to="StandardPoorsBBRatingMember" order="6.0" />
					<!--CreditRatingAMBestDomain Only presentation and label linkbases-->	
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CreditRatingAMBestDomain" xlink:label="CreditRatingAMBestDomain"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CreditQualityDomain" xlink:to="CreditRatingAMBestDomain" xbrldt:usable="false" order="4.1"/>
				</link:presentationLink>
				<link:presentationLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails">            
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ShareClassDomain" xlink:label="ShareClassDomain"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_C000246109Member" xlink:label="C000246109Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000246109Member" order="2.0" />
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_C000248162Member" xlink:label="C000248162Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000248162Member" order="3.0" />
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_C000248350Member" xlink:label="C000248350Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000248350Member" order="4.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_AdditionalIndexDomain" xlink:label="AdditionalIndexDomain"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_ICEBofAUSBroadMarketIndexMember" xlink:label="ICEBofAUSBroadMarketIndexMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="AdditionalIndexDomain" xlink:to="ICEBofAUSBroadMarketIndexMember" order="2.0" />
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_BloombergNonAgencyInvestmentGradeCMBSUSAggregateEligibleAaaIndexMember" xlink:label="BloombergNonAgencyInvestmentGradeCMBSUSAggregateEligibleAaaIndexMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="AdditionalIndexDomain" xlink:to="BloombergNonAgencyInvestmentGradeCMBSUSAggregateEligibleAaaIndexMember" order="3.0" />
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_ICEBofAUSABSAndCMBSIndexMember" xlink:label="ICEBofAUSABSAndCMBSIndexMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="AdditionalIndexDomain" xlink:to="ICEBofAUSABSAndCMBSIndexMember" order="4.0" /> 
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_BroadBasedIndexDomain" xlink:label="BroadBasedIndexDomain"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_BloombergUSAggregateBondIndexMember" xlink:label="BloombergUSAggregateBondIndexMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="BroadBasedIndexDomain" xlink:to="BloombergUSAggregateBondIndexMember" order="2.0" />			  			  
				</link:presentationLink>
				<link:presentationLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails">            
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ShareClassDomain" xlink:label="ShareClassDomain"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_C000246109Member" xlink:label="C000246109Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000246109Member" order="2.0" />
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_C000248162Member" xlink:label="C000248162Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000248162Member" order="3.0" />
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_C000248350Member" xlink:label="C000248350Member"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ShareClassDomain" xlink:to="C000248350Member" order="4.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_AdditionalIndexDomain" xlink:label="AdditionalIndexDomain"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_ICEBofAUSBroadMarketIndexMember" xlink:label="ICEBofAUSBroadMarketIndexMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="AdditionalIndexDomain" xlink:to="ICEBofAUSBroadMarketIndexMember" order="2.0" />
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_BloombergNonAgencyInvestmentGradeCMBSUSAggregateEligibleAaaIndexMember" xlink:label="BloombergNonAgencyInvestmentGradeCMBSUSAggregateEligibleAaaIndexMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="AdditionalIndexDomain" xlink:to="BloombergNonAgencyInvestmentGradeCMBSUSAggregateEligibleAaaIndexMember" order="3.0" />
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_ICEBofAUSABSAndCMBSIndexMember" xlink:label="ICEBofAUSABSAndCMBSIndexMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="AdditionalIndexDomain" xlink:to="ICEBofAUSABSAndCMBSIndexMember" order="4.0" /> 
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_BroadBasedIndexDomain" xlink:label="BroadBasedIndexDomain"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_BloombergUSAggregateBondIndexMember" xlink:label="BloombergUSAggregateBondIndexMember"/>
					<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="BroadBasedIndexDomain" xlink:to="BloombergUSAggregateBondIndexMember" order="2.0" />
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_WithSalesLoadMember" xlink:label="WithSalesLoadMember"/>
				</link:presentationLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/ClassOnly">               
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ShareClassDomain" xlink:label="ShareClassDomain"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_C000246109Member" xlink:label="C000246109Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000246109Member" order="1.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_C000248162Member" xlink:label="C000248162Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000248162Member" order="2.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_C000248350Member" xlink:label="C000248350Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000248350Member" order="3.0"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/Other1CategoryOnly">               
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_OtherCategory1Domain" xlink:label="OtherCategory1Domain"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/Other2CategoryOnly">               
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_OtherCategory2Domain" xlink:label="OtherCategory2Domain"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/LargestHoldingOnly">               
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_LargestHoldingsDomain" xlink:label="LargestHoldingsDomain"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/SalesLoadOnly">
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_WithSalesLoadMember" xlink:label="WithSalesLoadMember"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists">               
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="InvestmentTypeCategorizationMember"/>
					<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="1.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_ShortGovernmentAgencyMember" xlink:label="ShortGovernmentAgencyMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="ShortGovernmentAgencyMember" order="2.0"/>
					<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="3.0"/>
					<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="4.0"/>
					<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="5.0"/>
					<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="6.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_ForeignCorporateBondsAndNotesMember" xlink:label="ForeignCorporateBondsAndNotesMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="ForeignCorporateBondsAndNotesMember" 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_CorporateBondsAndNotesMember" xlink:label="CorporateBondsAndNotesMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="CorporateBondsAndNotesMember" order="9.0"/>
					<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="10.0"/>
					<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="11.0"/>
					<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="12.0"/>
					<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="13.0"/>
					<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:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="MoneyMarketFundsMember" order="14.0"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MunicipalBondsMember" xlink:label="MunicipalBondsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="MunicipalBondsMember" order="15.0"/>
					<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="16.0"/>
					<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="17.0"/>
				</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:loc xlink:type="locator" xlink:href="#ftetfiv_BloombergUSAggregateBondIndexMember" xlink:label="BloombergUSAggregateBondIndexMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BroadBasedIndexDomain" xlink:to="BloombergUSAggregateBondIndexMember" order="1.0"/>
				</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:loc xlink:type="locator" xlink:href="#ftetfiv_ICEBofAUSBroadMarketIndexMember" xlink:label="ICEBofAUSBroadMarketIndexMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AdditionalIndexDomain" xlink:to="ICEBofAUSBroadMarketIndexMember" order="1.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_BloombergNonAgencyInvestmentGradeCMBSUSAggregateEligibleAaaIndexMember" xlink:label="BloombergNonAgencyInvestmentGradeCMBSUSAggregateEligibleAaaIndexMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AdditionalIndexDomain" xlink:to="BloombergNonAgencyInvestmentGradeCMBSUSAggregateEligibleAaaIndexMember" order="2.0"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_ICEBofAUSABSAndCMBSIndexMember" xlink:label="ICEBofAUSABSAndCMBSIndexMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AdditionalIndexDomain" xlink:to="ICEBofAUSABSAndCMBSIndexMember" order="3.0"/>
				</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: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: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="#ftetfiv_GovernmentAndAgencyMember" xlink:label="GovernmentAndAgencyMember"/>
					<link:label xlink:type="resource" xlink:label="label_GovernmentAndAgencyMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Government And Agency [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="GovernmentAndAgencyMember" xlink:to="label_GovernmentAndAgencyMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_ShortGovernmentAgencyMember" xlink:label="ShortGovernmentAgencyMember"/>
					<link:label xlink:type="resource" xlink:label="label_ShortGovernmentAgencyMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Short Government Agency [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ShortGovernmentAgencyMember" xlink:to="label_ShortGovernmentAgencyMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_MoneyMarketFundsQualityMember" xlink:label="MoneyMarketFundsQualityMember"/>
					<link:label xlink:type="resource" xlink:label="label_MoneyMarketFundsQualityMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Money Market Funds Quality [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MoneyMarketFundsQualityMember" xlink:to="label_MoneyMarketFundsQualityMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_NetOtherAssetsAndLiabilitiesMember" xlink:label="NetOtherAssetsAndLiabilitiesMember"/>
					<link:label xlink:type="resource" xlink:label="label_NetOtherAssetsAndLiabilitiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Net Other Assets and Liabilities [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="NetOtherAssetsAndLiabilitiesMember" xlink:to="label_NetOtherAssetsAndLiabilitiesMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_WrittenOptionsMember" xlink:label="WrittenOptionsMember"/>
					<link:label xlink:type="resource" xlink:label="label_WrittenOptionsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Written Options [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="WrittenOptionsMember" xlink:to="label_WrittenOptionsMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_USGovernmentAgencyMortgageBackedSecuritiesSoldShortMember" xlink:label="USGovernmentAgencyMortgageBackedSecuritiesSoldShortMember"/>
					<link:label xlink:type="resource" xlink:label="label_USGovernmentAgencyMortgageBackedSecuritiesSoldShortMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">U S Government Agency Mortgage Backed Securities Sold Short [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="USGovernmentAgencyMortgageBackedSecuritiesSoldShortMember" xlink:to="label_USGovernmentAgencyMortgageBackedSecuritiesSoldShortMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_PurchasedOptionsMember" xlink:label="PurchasedOptionsMember"/>
					<link:label xlink:type="resource" xlink:label="label_PurchasedOptionsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Purchased Options [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="PurchasedOptionsMember" xlink:to="label_PurchasedOptionsMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_ForeignCorporateBondsAndNotesMember" xlink:label="ForeignCorporateBondsAndNotesMember"/>
					<link:label xlink:type="resource" xlink:label="label_ForeignCorporateBondsAndNotesMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Foreign Corporate Bonds and Notes [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ForeignCorporateBondsAndNotesMember" xlink:to="label_ForeignCorporateBondsAndNotesMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_USGovernmentBondsAndNotesMember" xlink:label="USGovernmentBondsAndNotesMember"/>
					<link:label xlink:type="resource" xlink:label="label_USGovernmentBondsAndNotesMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">U S Government Bonds and Notes [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="USGovernmentBondsAndNotesMember" xlink:to="label_USGovernmentBondsAndNotesMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_CorporateBondsAndNotesMember" xlink:label="CorporateBondsAndNotesMember"/>
					<link:label xlink:type="resource" xlink:label="label_CorporateBondsAndNotesMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Corporate Bonds and Notes [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CorporateBondsAndNotesMember" xlink:to="label_CorporateBondsAndNotesMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_USGovernmentAgencyMortgageBackedSecuritiesMember" xlink:label="USGovernmentAgencyMortgageBackedSecuritiesMember"/>
					<link:label xlink:type="resource" xlink:label="label_USGovernmentAgencyMortgageBackedSecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">U S Government Agency Mortgage Backed Securities [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="USGovernmentAgencyMortgageBackedSecuritiesMember" xlink:to="label_USGovernmentAgencyMortgageBackedSecuritiesMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_ICEBofAUSBroadMarketIndexMember" xlink:label="ICEBofAUSBroadMarketIndexMember"/>
					<link:label xlink:type="resource" xlink:label="label_ICEBofAUSBroadMarketIndexMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">ICE BofA US Broad Market Index [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ICEBofAUSBroadMarketIndexMember" xlink:to="label_ICEBofAUSBroadMarketIndexMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_BloombergUSAggregateBondIndexMember" xlink:label="BloombergUSAggregateBondIndexMember"/>
					<link:label xlink:type="resource" xlink:label="label_BloombergUSAggregateBondIndexMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Bloomberg US Aggregate Bond Index [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BloombergUSAggregateBondIndexMember" xlink:to="label_BloombergUSAggregateBondIndexMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_C000246109Member" xlink:label="C000246109Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000246109Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000246109 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000246109Member" xlink:to="label_C000246109Member"/>
										<link:label xlink:type="resource" xlink:label="label_C000246109Member_2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Class Composite</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000246109Member" xlink:to="label_C000246109Member_2"/>
					<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:label xlink:type="resource" xlink:label="label_MortgageBackedSecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Collateralized Mortgage-Backed Securities [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MortgageBackedSecuritiesMember" xlink:to="label_MortgageBackedSecuritiesMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember" xlink:label="AssetBackedSecuritiesMember"/>
					<link:label xlink:type="resource" xlink:label="label_AssetBackedSecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Asset-Backed Securities [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AssetBackedSecuritiesMember" xlink:to="label_AssetBackedSecuritiesMember"/>
					<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="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/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/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MunicipalBondsMember" xlink:label="MunicipalBondsMember"/>
					<link:label xlink:type="resource" xlink:label="label_MunicipalBondsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Municipal Bonds [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MunicipalBondsMember" xlink:to="label_MunicipalBondsMember"/>
					<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/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_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/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_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="#ftetfiv_C000248162Member" xlink:label="C000248162Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000248162Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000248162 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000248162Member" xlink:to="label_C000248162Member"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_BloombergNonAgencyInvestmentGradeCMBSUSAggregateEligibleAaaIndexMember" xlink:label="BloombergNonAgencyInvestmentGradeCMBSUSAggregateEligibleAaaIndexMember"/>
					<link:label xlink:type="resource" xlink:label="label_BloombergNonAgencyInvestmentGradeCMBSUSAggregateEligibleAaaIndexMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Bloomberg Non Agency Investment Grade CMBS US Aggregate Eligible Aaa Index [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BloombergNonAgencyInvestmentGradeCMBSUSAggregateEligibleAaaIndexMember" xlink:to="label_BloombergNonAgencyInvestmentGradeCMBSUSAggregateEligibleAaaIndexMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_ICEBofAUSABSAndCMBSIndexMember" xlink:label="ICEBofAUSABSAndCMBSIndexMember"/>
					<link:label xlink:type="resource" xlink:label="label_ICEBofAUSABSAndCMBSIndexMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">ICE BofA US ABS And CMBS Index [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ICEBofAUSABSAndCMBSIndexMember" xlink:to="label_ICEBofAUSABSAndCMBSIndexMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_ShortGovernmentAndAgencyMember" xlink:label="ShortGovernmentAndAgencyMember"/>
					<link:label xlink:type="resource" xlink:label="label_ShortGovernmentAndAgencyMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Short Government And Agency [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ShortGovernmentAndAgencyMember" xlink:to="label_ShortGovernmentAndAgencyMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_NRMember" xlink:label="NRMember"/>
					<link:label xlink:type="resource" xlink:label="label_NRMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">NR [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="NRMember" xlink:to="label_NRMember"/>
					<link:loc xlink:type="locator" xlink:href="#ftetfiv_C000248350Member" xlink:label="C000248350Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000248350Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000248350 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000248350Member" xlink:to="label_C000248350Member"/>
					<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_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/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeAxis" xlink:label="InvestmentTypeAxis"/>
					<link:label xlink:type="resource" xlink:label="label_InvestmentTypeAxis" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Investment Type [Axis]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="InvestmentTypeAxis" xlink:to="label_InvestmentTypeAxis" priority="1"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsNet" xlink:label="AssetsNet"/>
					<link:label xlink:type="resource" xlink:label="label_AssetsNet" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Net Assets</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AssetsNet" xlink:to="label_AssetsNet" priority="1"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentCompanyPortfolioTurnover" xlink:label="InvestmentCompanyPortfolioTurnover"/>
					<link:label xlink:type="resource" xlink:label="label_InvestmentCompanyPortfolioTurnover" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Investment Company Portfolio Turnover</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="InvestmentCompanyPortfolioTurnover" xlink:to="label_InvestmentCompanyPortfolioTurnover" priority="1"/>                
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_NoTradingSymbolFlag" xlink:label="dei_NoTradingSymbolFlag"/>
					<link:label xlink:type="resource" xlink:label="label_NoTradingSymbolFlag" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">No Trading Symbol Flag</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_NoTradingSymbolFlag" xlink:to="label_NoTradingSymbolFlag" priority="1"/>		
				</link:labelLink>
			</link:linkbase>
		</appinfo>
	</annotation>   
	<element name="GovernmentAndAgencyMember" id="ftetfiv_GovernmentAndAgencyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="ShortGovernmentAgencyMember" id="ftetfiv_ShortGovernmentAgencyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="MoneyMarketFundsQualityMember" id="ftetfiv_MoneyMarketFundsQualityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="NetOtherAssetsAndLiabilitiesMember" id="ftetfiv_NetOtherAssetsAndLiabilitiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="WrittenOptionsMember" id="ftetfiv_WrittenOptionsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="USGovernmentAgencyMortgageBackedSecuritiesSoldShortMember" id="ftetfiv_USGovernmentAgencyMortgageBackedSecuritiesSoldShortMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="PurchasedOptionsMember" id="ftetfiv_PurchasedOptionsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="ForeignCorporateBondsAndNotesMember" id="ftetfiv_ForeignCorporateBondsAndNotesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="USGovernmentBondsAndNotesMember" id="ftetfiv_USGovernmentBondsAndNotesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="CorporateBondsAndNotesMember" id="ftetfiv_CorporateBondsAndNotesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="USGovernmentAgencyMortgageBackedSecuritiesMember" id="ftetfiv_USGovernmentAgencyMortgageBackedSecuritiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="ICEBofAUSBroadMarketIndexMember" id="ftetfiv_ICEBofAUSBroadMarketIndexMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="BloombergUSAggregateBondIndexMember" id="ftetfiv_BloombergUSAggregateBondIndexMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000246109Member" id="ftetfiv_C000246109Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000248162Member" id="ftetfiv_C000248162Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="BloombergNonAgencyInvestmentGradeCMBSUSAggregateEligibleAaaIndexMember" id="ftetfiv_BloombergNonAgencyInvestmentGradeCMBSUSAggregateEligibleAaaIndexMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="ICEBofAUSABSAndCMBSIndexMember" id="ftetfiv_ICEBofAUSABSAndCMBSIndexMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="ShortGovernmentAndAgencyMember" id="ftetfiv_ShortGovernmentAndAgencyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="NRMember" id="ftetfiv_NRMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000248350Member" id="ftetfiv_C000248350Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
</schema>
