MFS SERIES TRUST III, 497J, 1998-09-17

MFS SERIES TRUST III
497J, 1998-09-17

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                              MFS SERIES TRUST III
               500 Boylston Street Boston Massachusetts 02116-3741
                                  617 954 5000




                                        September 17, 1998




VIA EDGAR

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

         Re:  MFS Series Trust III (the "Trust") (File No. 2-60491) on behalf of
              MFS Municipal High Income Fund

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 Trust do not  differ  from those  contained  in
Post-Effective  Amendment No. 27 (the  "Amendment") to the Trust's  Registration
Statement on Form N-1A. The Amendment was filed  electronically on September 17,
1998.

         Please call the undersigned or Nicole E. Leonard at (617) 954-5169 or
(800) 343-2829 with any questions you may have.

                                        Very truly yours,


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

JRB/bjn