MFS SERIES TRUST III, 497J, 1997-06-02

MFS SERIES TRUST III
497J, 1997-06-02

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




                                            June 2, 1997



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)

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 each  Series of the Trust do not differ  from those
contained in  Post-Effective  Amendment No. 24 (the  "Amendment") to the Trust's
Registration  Statement on Form N-1A. The Amendment was filed  electronically on
May 29, 1997.

         Please call the undersigned or Sharon Julius-Doucette at (617) 954-5406
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