<SEC-DOCUMENT>0001209191-23-025985.txt : 20230428
<SEC-HEADER>0001209191-23-025985.hdr.sgml : 20230428
<ACCEPTANCE-DATETIME>20230428121741
ACCESSION NUMBER:		0001209191-23-025985
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20230426
FILED AS OF DATE:		20230428
DATE AS OF CHANGE:		20230428

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Cusack Mareile B.
		CENTRAL INDEX KEY:			0001965390

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-22533
		FILM NUMBER:		23862674

	MAIL ADDRESS:	
		STREET 1:		DUFF & PHELPS INVESTMENT MANAGEMENT CO.
		STREET 2:		200 SOUTH WACKER DRIVE, SUITE 500
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60640

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Duff & Phelps Utility & Infrastructure Fund Inc.
		CENTRAL INDEX KEY:			0001515671
		IRS NUMBER:				452261437
		FISCAL YEAR END:			1031

	BUSINESS ADDRESS:	
		STREET 1:		200 SOUTH WACKER DRIVE
		STREET 2:		SUITE 500
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60606
		BUSINESS PHONE:		(866) 270-7598

	MAIL ADDRESS:	
		STREET 1:		200 SOUTH WACKER DRIVE
		STREET 2:		SUITE 500
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60606

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Duff & Phelps Global Utility Income Fund Inc.
		DATE OF NAME CHANGE:	20110627

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Duff & Phelps Global Utility & Midstream Energy Income Fund Inc.
		DATE OF NAME CHANGE:	20110316
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0407</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2023-04-26</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001515671</issuerCik>
        <issuerName>Duff &amp; Phelps Utility &amp; Infrastructure Fund Inc.</issuerName>
        <issuerTradingSymbol>DPG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001965390</rptOwnerCik>
            <rptOwnerName>Cusack Mareile B.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>DUFF &amp; PHELPS INVESTMENT MANAGEMENT CO.</rptOwnerStreet1>
            <rptOwnerStreet2>200 SOUTH WACKER DRIVE, SUITE 500</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60640</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2023-04-26</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1335</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>12.58</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1335</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes></footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Mareile B. Cusack</signatureName>
        <signatureDate>2023-04-28</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
