<SEC-DOCUMENT>0001683863-23-000176-index.html : 20230119
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ACCESSION NUMBER:		0001683863-23-000176
CONFORMED SUBMISSION TYPE:	N-CSR
PUBLIC DOCUMENT COUNT:		22
CONFORMED PERIOD OF REPORT:	20221130
FILED AS OF DATE:		20230119
DATE AS OF CHANGE:		20230119
EFFECTIVENESS DATE:		20230119

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-CSR
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-04992
		FILM NUMBER:		23536720

	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
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<FILENAME>f24064d1.htm
<DESCRIPTION>MFS HIGH YIELD MUNICIPAL TRUST NCSR
<TEXT>
Document 1 - file: f24064d1.htm

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<DESCRIPTION>99.COE
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Document 2 - file: f24064d2.htm

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<DOCUMENT>
<TYPE>EX-99.302 CERT
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<FILENAME>f24064d3.htm
<DESCRIPTION>99.302CERT
<TEXT>
Document 3 - file: f24064d3.htm

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<DOCUMENT>
<TYPE>EX-99.906 CERT
<SEQUENCE>4
<FILENAME>f24064d4.htm
<DESCRIPTION>99.906CERT
<TEXT>
Document 4 - file: f24064d4.htm

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<DOCUMENT>
<TYPE>EX-99.30E-3
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<DESCRIPTION>99.30E-3
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Document 5 - file: f24064d5.htm

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Document 6 - file: f24064d6.htm

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Document 7 - file: img14ab14858.gif

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Document 8 - file: img21ff470c1.gif

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Document 9 - file: img298851996.jpg

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Document 10 - file: img40cfb2b33.jpg

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Document 11 - file: img5d760f1d9.gif

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Document 12 - file: img86f82e4c4.gif

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Document 13 - file: imgb7c397be5.jpg

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Document 14 - file: imgf70d67507.jpg

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Document 15 - file: imgf9208c5a2.gif

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Document 16 - file: cmu-1btonotice3x1.jpg

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Document 17 - file: cmu-1btonotice5x1.jpg

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Document 18 - file: cmu-99coe1x1.jpg

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Document 19 - file: cmu-9930e32x1.jpg

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Document 20 - file: cmu-9930e33x1.jpg

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Document 21 - file: cmu-99proxypol14x1.jpg

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Document 22 - file: cmu-99proxypol17x1.jpg

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