<SEC-DOCUMENT>0001213900-24-103298.txt : 20241127
<SEC-HEADER>0001213900-24-103298.hdr.sgml : 20241127
<ACCEPTANCE-DATETIME>20241127130420
ACCESSION NUMBER:		0001213900-24-103298
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20241126
FILED AS OF DATE:		20241127
DATE AS OF CHANGE:		20241127

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Grumhaus David D Jr.
		CENTRAL INDEX KEY:			0001611309
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-22533
		FILM NUMBER:		241509117

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

ISSUER:		

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

	BUSINESS ADDRESS:	
		STREET 1:		10 SOUTH WACKER DRIVE
		STREET 2:		SUITE 1900
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60606
		BUSINESS PHONE:		(866) 270-7598

	MAIL ADDRESS:	
		STREET 1:		10 SOUTH WACKER DRIVE
		STREET 2:		SUITE 1900
		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>marketforms-67441.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2024-11-26</periodOfReport>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001611309</rptOwnerCik>
            <rptOwnerName>Grumhaus David D Jr.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>10 S. WACKER DR., 19TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60606</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>true</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle>President and CEO</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2024-11-26</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1500</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>12.32</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>9877</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Includes 377 shares acquired by the reporting person since his last Form 4 filing through a dividend reinvestment plan meeting the requirements of Rule 16a-11 promulgated under the Securities Exchange Act of 1934. Total number of shares held through the plan is 377.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ David D. Grumhaus, Jr.</signatureName>
        <signatureDate>2024-11-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
