MFS SERIES TRUST III, 497, 1995-06-05

MFS SERIES TRUST III
497, 1995-06-05

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                              MFS SERIES TRUST III
             500 BOYLSTON STREET, BOSTON, MASSACHUSETTS 02116-3741
                                (617) 954-5000




                                                         June 5, 1995



VIA EDGAR

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

         Re:    MFS Series Trust III (the "Trust"):
                      MFS High Income Fund
                      MFS Municipal High Income Fund
                (File Nos. 2-60491 and 811-2794)

Ladies and Gentlemen:

         Pursuant to Rule 497(j) under the  Securities  Act of 1933, as amended,
please accept this letter as certification that each Prospectus and Statement of
Additional  Information  for the individual  series of the Trust does not differ
from that contained in Post-Effective  Amendment No. 20 (the "Amendment") to the
Trust's  Registration  Statement on Form N-1A, which was filed electronically on
May 31, 1995.

     Please call the  undersigned  or Laurie  Buckley at (617) 954-5873 or (800)
343-2829 Ext. 5873 with any questions you may have.

                                                         Very truly yours,



                                                         James R. Bordewick, Jr.
                                                           Assistant Secretary

JRB/bjn