    <SEC-DOCUMENT>0001193125-23-182584-index.html : 20230706
    <SEC-HEADER>0001193125-23-182584.hdr.sgml : 20230706
    <ACCEPTANCE-DATETIME>20230706111955
    ACCESSION NUMBER:		0001193125-23-182584
    CONFORMED SUBMISSION TYPE:	N-CSRS
    PUBLIC DOCUMENT COUNT:		3
    CONFORMED PERIOD OF REPORT:	20230430
    FILED AS OF DATE:		20230706
    DATE AS OF CHANGE:		20230706
    EFFECTIVENESS DATE:		20230706

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			NUVEEN MUNICIPAL INCOME FUND INC
    		CENTRAL INDEX KEY:			0000830271
    		IRS NUMBER:				363566347
    		STATE OF INCORPORATION:			MN
    		FISCAL YEAR END:			1031

    	FILING VALUES:
    		FORM TYPE:		N-CSRS
    		SEC ACT:		1940 Act
    		SEC FILE NUMBER:	811-05488
    		FILM NUMBER:		231072574

    	BUSINESS ADDRESS:
    		STREET 1:		333 W WACKER DR
    		CITY:			CHICAGO
    		STATE:			IL
    		ZIP:			60606
    		BUSINESS PHONE:		3129178200

    	MAIL ADDRESS:
    		STREET 1:		333 W WACKER DRIVE
    		CITY:			CHICAGO
    		STATE:			IL
    		ZIP:			60606
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>N-CSRS
    <SEQUENCE>1
    <FILENAME>d493684dncsrs.htm
    <DESCRIPTION>NUVEEN MUNICIPAL INCOME FUND, INC.
    <TEXT>
    Document 1 - file: d493684dncsrs.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CERT
    <SEQUENCE>2
    <FILENAME>d493684dex99cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT
    <TEXT>
    Document 2 - file: d493684dex99cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.906CERT
    <SEQUENCE>3
    <FILENAME>d493684dex99906cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT
    <TEXT>
    Document 3 - file: d493684dex99906cert.htm

    </DOCUMENT>
    </SEC-DOCUMENT>