MFS SERIES TRUST III, 497J, 1996-06-03

MFS SERIES TRUST III
497J, 1996-06-03

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                              MFS SERIES TRUST III
             500 BOYLSTON STREET o BOSTON o MASSACHUSETTS 02116-3741
                                 617 o 954-5000




                                            June 3, 1996




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 High Income Fund and MFS Municipal High Income Fund (a
              series of MFS Series Trust III)

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 individual  series of the Trust does not differ
from that contained in Post-Effective  Amendment No. 22 (the "Amendment") to the
Trust's   Registration   Statement  on  Form  N-1A.  This  Amendment  was  filed
electronically on May 29, 1996.

         Please call Sharon Julius-Doucette at (617) 954-5406 or (800)
343-2829 ext. 5406 with any questions you may have.

                                            Very truly yours,



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

JRB/bjn