MFS SERIES TRUST X, 497J, 1997-12-01

MFS SERIES TRUST X
497J, 1997-12-01

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




                                    December 1, 1997



VIA EDGAR

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

         Re:  MFS Series Trust X (the "Trust") (File No. 33-1657) on Behalf of
              MFS Government Mortgage 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. 20 (the  "Amendment") to the Trust's  Registration
Statement on Form N-1A. The Amendment was filed  electronically  on November 26,
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