<SEC-DOCUMENT>0001193125-21-221681-index.html : 20210722
<SEC-HEADER>0001193125-21-221681.hdr.sgml : 20210722
<ACCEPTANCE-DATETIME>20210722132559
ACCESSION NUMBER:		0001193125-21-221681
CONFORMED SUBMISSION TYPE:	N-CSRS
PUBLIC DOCUMENT COUNT:		16
CONFORMED PERIOD OF REPORT:	20210531
FILED AS OF DATE:		20210722
DATE AS OF CHANGE:		20210722
EFFECTIVENESS DATE:		20210722

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MFS HIGH YIELD MUNICIPAL TRUST
		CENTRAL INDEX KEY:			0000809844
		IRS NUMBER:				042950868
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1130

	FILING VALUES:
		FORM TYPE:		N-CSRS
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-04992
		FILM NUMBER:		211106963

	BUSINESS ADDRESS:	
		STREET 1:		111 HUNTINGTON AVENUE
		STREET 2:		24TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02199
		BUSINESS PHONE:		617-954-5000

	MAIL ADDRESS:	
		STREET 1:		111 HUNTINGTON AVENUE
		STREET 2:		24TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02199

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	COLONIAL MUNICIPAL INCOME TRUST
		DATE OF NAME CHANGE:	19920703
</SEC-HEADER>
<DOCUMENT>
<TYPE>N-CSRS
<SEQUENCE>1
<FILENAME>d127151dncsrs.htm
<DESCRIPTION>MFS HIGH YIELD MUNICIPAL TRUST N-CSRS
<TEXT>
Document 1 - file: d127151dncsrs.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.CERT
<SEQUENCE>2
<FILENAME>d127151dex99cert.htm
<DESCRIPTION>SECTION 302 CERTIFICATIONS
<TEXT>
Document 2 - file: d127151dex99cert.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.906CERT
<SEQUENCE>3
<FILENAME>d127151dex99906cert.htm
<DESCRIPTION>SECTION 906 CERTIFICATIONS
<TEXT>
Document 3 - file: d127151dex99906cert.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.30E3 NOTICE
<SEQUENCE>4
<FILENAME>d127151dex9930e3notice.htm
<DESCRIPTION>30E3 NOTICE
<TEXT>
Document 4 - file: d127151dex9930e3notice.htm

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<SEQUENCE>5
<FILENAME>g127151g11j58.jpg
<DESCRIPTION>GRAPHIC
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Document 5 - file: g127151g11j58.jpg

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<DESCRIPTION>GRAPHIC
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Document 6 - file: g127151g31b52.jpg

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<FILENAME>g127151g52z61.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: g127151g52z61.jpg

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<FILENAME>g127151g55f64.jpg
<DESCRIPTION>GRAPHIC
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Document 8 - file: g127151g55f64.jpg

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Document 9 - file: g127151g85c16.jpg

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Document 10 - file: g127151img370cca6f1.gif

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Document 11 - file: g127151img46ba94e53.jpg

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Document 12 - file: g127151img8a8e4d812.gif

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<FILENAME>g127151img8e3e58aa7.gif
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<TEXT>
Document 13 - file: g127151img8e3e58aa7.gif

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<DESCRIPTION>GRAPHIC
<TEXT>
Document 14 - file: g127151img9aa563ff5.jpg

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<SEQUENCE>15
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<DESCRIPTION>GRAPHIC
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Document 15 - file: g127151imga32978226.jpg

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Document 16 - file: g127151imgb18b82a54.gif

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