<SEC-DOCUMENT>0001410368-17-001085-index.html : 20170727
<SEC-HEADER>0001410368-17-001085.hdr.sgml : 20170727
<ACCEPTANCE-DATETIME>20170727131637
ACCESSION NUMBER:		0001410368-17-001085
CONFORMED SUBMISSION TYPE:	NSAR-B
PUBLIC DOCUMENT COUNT:		3
CONFORMED PERIOD OF REPORT:	20170531
FILED AS OF DATE:		20170727
DATE AS OF CHANGE:		20170727
EFFECTIVENESS DATE:		20170727

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MainStay DefinedTerm Municipal Opportunities Fund
		CENTRAL INDEX KEY:			0001518557
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0531

	FILING VALUES:
		FORM TYPE:		NSAR-B
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-22551
		FILM NUMBER:		17985426

	BUSINESS ADDRESS:	
		STREET 1:		51 MADISON AVENUE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10010
		BUSINESS PHONE:		212-576-7000

	MAIL ADDRESS:	
		STREET 1:		51 MADISON AVENUE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10010

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MainStay DefinedTerm Municipal High Income Fund
		DATE OF NAME CHANGE:	20110419
</SEC-HEADER>
<DOCUMENT>
<TYPE>NSAR-B
<SEQUENCE>1
<FILENAME>answer.fil
<DESCRIPTION>ANSWER FILE
<TEXT>
Document 1 - file: answer.fil

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.77B ACCT LTTR
<SEQUENCE>2
<FILENAME>exhibit77b.txt
<DESCRIPTION>ACCT LETTER
<TEXT>
Document 2 - file: exhibit77b.txt

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.77Q1 OTHR EXHB
<SEQUENCE>3
<FILENAME>signaturepage.txt
<DESCRIPTION>SIG PAGE
<TEXT>
Document 3 - file: signaturepage.txt

</DOCUMENT>
</SEC-DOCUMENT>