MFS SERIES TRUST X, 497J, 1995-11-30

MFS SERIES TRUST X
497J, 1995-11-30

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




                                       November 30, 1995




VIA EDGAR

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

    Re:  MFS Series Trust X (the "Trust"), on behalf of MFS Government Mortgage
         Fund, a series of the Trust (File Nos. 33-1657 and 811-4492)

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 Fund does not  differ  from that  contained  in
Post-Effective  Amendment No. 13 (the  "Amendment") to the Trust's  Registration
Statement on Form N-1A. This Amendment was filed  electronically on November 28,
1995.

    Please call the undersigned or Kendra D. McGeorge at (800) 343-2829
Ext. 5034 with any questions you may have.

                                       Very truly yours,



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

JRB/bjn