    <SEC-DOCUMENT>0001193125-23-179641-index.html : 20230630
    <SEC-HEADER>0001193125-23-179641.hdr.sgml : 20230630
    <ACCEPTANCE-DATETIME>20230630091056
    ACCESSION NUMBER:		0001193125-23-179641
    CONFORMED SUBMISSION TYPE:	N-CSRS
    PUBLIC DOCUMENT COUNT:		7
    CONFORMED PERIOD OF REPORT:	20230430
    FILED AS OF DATE:		20230630
    DATE AS OF CHANGE:		20230630
    EFFECTIVENESS DATE:		20230630

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			DNP SELECT INCOME FUND INC
    		CENTRAL INDEX KEY:			0000806628
    		IRS NUMBER:				363480989
    		STATE OF INCORPORATION:			MD
    		FISCAL YEAR END:			1031

    	FILING VALUES:
    		FORM TYPE:		N-CSRS
    		SEC ACT:		1940 Act
    		SEC FILE NUMBER:	811-04915
    		FILM NUMBER:		231059757

    	BUSINESS ADDRESS:
    		STREET 1:		PO BOX 32760
    		CITY:			LOUISVILLE
    		STATE:			KY
    		ZIP:			40232
    		BUSINESS PHONE:		3123685510

    	MAIL ADDRESS:
    		STREET 1:		PO BOX 32760
    		CITY:			LOUISVILLE
    		STATE:			KY
    		ZIP:			40232

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	DUFF & PHELPS SELECTED UTILITIES INC
    		DATE OF NAME CHANGE:	19910429
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>N-CSRS
    <SEQUENCE>1
    <FILENAME>d493753dncsrs.htm
    <DESCRIPTION>DNP SELECT INCOME FUND INC
    <TEXT>
    Document 1 - file: d493753dncsrs.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CERT
    <SEQUENCE>2
    <FILENAME>d493753dex99cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT
    <TEXT>
    Document 2 - file: d493753dex99cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.906CERT
    <SEQUENCE>3
    <FILENAME>d493753dex99906cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT
    <TEXT>
    Document 3 - file: d493753dex99906cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.C
    <SEQUENCE>4
    <FILENAME>d493753dex99c.htm
    <DESCRIPTION>COPIES OF THE REGISTRANT'S NOTICES TO SHAREHOLDERS PURSUANT TO RULE 19A-1
    <TEXT>
    Document 4 - file: d493753dex99c.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>g493753g01b10.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: g493753g01b10.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>g493753g02z61.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: g493753g02z61.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>g493753g44c41.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: g493753g44c41.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>