MASSACHUSETTS FINANCIAL SERVICES COMPANY
              500 Boylston Street, Boston, Massachusetts 02116-3741
                                  617-954-5000




                                        June 21, 2007


VIA EDGAR
United States Securities & Exchange Commission
100 F Street, N.E.
Washington, D.C.  20549

     Re:  Request for  Withdrawal  of  Registration  Statement  on Form N-1A for
          MFS(R)   Series   Trust   IV   File   No.   2-54607;   Accession   No.
          0001047469-07-002353

Ladies and Gentlemen:

     Pursuant to Rule 477 under the Securities Act of 1933, the MFS Series Trust
IV (the  "Registrant"),  on  behalf  of MFS  Money  Market  Fund  (the  "Fund"),
respectfully   requests  that  the  Securities  and  Exchange   Commission  (the
"Commission")  consent  to the  withdrawal  of the  above  captioned  Form  N-1A
Registration Statement (File Nos. 2-54607) filed with the Commission at 11:02 AM
on March 30, 2007 (the "Registration Statement").

     This request for withdrawal is being made because the  Registrant  will not
be redesignating  shares of the Fund as Class A Shares,  nor will the Registrant
be registering  Class B, Class C, Class I, Class 529A,  Class 529B,  Class 529C,
Class R,  Class R1,  Class R2,  Class R3,  Class R4, and Class R5 Shares for the
Fund at this time. No securities were sold in connection  with the  Registration
Statement.

     Registrant  respectfully  submits  that a  withdrawal  of the  Registration
Statement is consistent with the public interest and the protection of investors
in light of the  circumstances  described  above.  Any questions  regarding this
matter  may be  directed  to  Nickolas  M.  Connery  at (617)  954-6124,  or the
undersigned at (617) 954-4340.

                                        Sincerely,




                                        SUSAN A. PEREIRA
                                        Susan A. Pereira
                                        Senior Counsel

SAP/bjn