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