MFS® INVESTMENT MANAGEMENT

500 BOYLSTON STREET, BOSTON, MASSACHUSETTS  02116-3741

(617) 954-5000

July 1, 2010

VIA EDGAR

United States Securities and Exchange Commission

100 F Street, N.E.

Washington, DC  20549

Re: MFS® Series Trust XIII (the “Trust”) (File Nos. 2-74959 and 811-3327) on behalf of MFS® Diversified Income Fund, MFS® Global Real Estate Fund and MFS® Government Securities Fund (the “Funds”)

Ladies and Gentlemen:

Pursuant to Rule 497(j) under the Securities Act of 1933, as amended, please accept this letter on behalf of the Trust as certification that the Prospectuses and Statements of Additional Information for the Funds do not differ from those contained in Post-Effective Amendment No. 44 (the “Amendment”) to the Trust’s Registration Statement on Form N-1A.  The Amendment was filed electronically on June 25, 2010

Please call the undersigned at (617) 954-5843 or Jennifer Moore at (617) 954-5923 with any questions you may have.

Very truly yours,

BRIAN E. LANGENFELD

Brian E. Langenfeld

Vice President & Senior Counsel

BEL/bjn