MFS MUNICIPAL SERIES TRUST, 497, 1995-08-01

MFS MUNICIPAL SERIES TRUST
497, 1995-08-01

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                               MFS MUNICIPAL SERIES TRUST
                                  500 BOYLSTON STREET
                                    BOSTON, MA 02116
                                      617/954-5000



August 1, 1995



VIA EDGAR

Securities and Exchange Commission
450 Fifth Street, NW
Washington, DC  20549

Re: MFS Municipal  Income Fund (the Fund), a Series of MFS Municipal Series
Trust (the Trust); File Nos. 2-92915 and 811-4096

Ladies and Gentlemen:

Pursuant  to Rule  497(j)  under the  Securities  Act of 1933,  as amended,
please accept this letter as certification  that the prospectus and statement of
additional  information  for the Fund does not  differ  from that  contained  in
Post-Effective  Amendment  No. 28 (the  Amendment)  to the Trust's  Registration
Statement on Form N-1A.  This  Amendment  was filed  electronically  on July 28,
1995.

Please call the  undersigned  or Karen M. Bates at (617)  954-5801 or (800)
343-2829 Ext. 5801 with any questions you may have.

Very truly yours,




JAMES R. BORDEWICK, JR.
James R. Bordewick, Jr.
Assitant Secretary