<SEC-DOCUMENT>0001821268-21-000260-index.html : 20210604
<SEC-HEADER>0001821268-21-000260.hdr.sgml : 20210604
<ACCEPTANCE-DATETIME>20210604122437
ACCESSION NUMBER:		0001821268-21-000260
CONFORMED SUBMISSION TYPE:	N-CSR
PUBLIC DOCUMENT COUNT:		10
CONFORMED PERIOD OF REPORT:	20210331
FILED AS OF DATE:		20210604
DATE AS OF CHANGE:		20210604
EFFECTIVENESS DATE:		20210604

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			NUVEEN SELECT MATURITIES MUNICIPAL FUND
		CENTRAL INDEX KEY:			0000890119
		IRS NUMBER:				363837799
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			0531

	FILING VALUES:
		FORM TYPE:		N-CSR
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-07056
		FILM NUMBER:		21995634

	BUSINESS ADDRESS:	
		STREET 1:		333 WEST WACKER DRIVE
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60606
		BUSINESS PHONE:		3129177200

	MAIL ADDRESS:	
		STREET 1:		333 W WACKER DRIVE
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60606

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	NUVEEN INTERMEDIATE OPPORTUNITY MUNICIPAL FUND
		DATE OF NAME CHANGE:	19600201
</SEC-HEADER>
<DOCUMENT>
<TYPE>N-CSR
<SEQUENCE>1
<FILENAME>ncsr.htm
<DESCRIPTION>NIM
<TEXT>
Document 1 - file: ncsr.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.CERT
<SEQUENCE>2
<FILENAME>ex99cert.htm
<DESCRIPTION>CERTIFICATIONS
<TEXT>
Document 2 - file: ex99cert.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.906 CERT
<SEQUENCE>3
<FILENAME>ex99906cert.htm
<DESCRIPTION>CERTIFICATION
<TEXT>
Document 3 - file: ex99906cert.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.CODE ETH
<SEQUENCE>4
<FILENAME>ex99codeofethics.htm
<DESCRIPTION>CODE OF ETHICS
<TEXT>
Document 4 - file: ex99codeofethics.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>nim-17x1x1.jpg
<TEXT>
Document 5 - file: nim-17x1x1.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>nim-17x4x1.jpg
<TEXT>
Document 6 - file: nim-17x4x1.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>nim-17x4x2.jpg
<TEXT>
Document 7 - file: nim-17x4x2.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>nim-17x11x1.jpg
<TEXT>
Document 8 - file: nim-17x11x1.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>nim-17x68x1.jpg
<TEXT>
Document 9 - file: nim-17x68x1.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>10
<FILENAME>nim-17x68x2.jpg
<TEXT>
Document 10 - file: nim-17x68x2.jpg

</DOCUMENT>
</SEC-DOCUMENT>