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82 Devonshire Street
Boston MA 02109-3614
617-563-7000

||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| January 28, 2010

U.S. Securities & Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

Attn: Christian Sandoe

RE:	Fidelity Advisor Series IV (the trust):
	Fidelity Institutional Short-Intermediate Government Fund (the fund)
	File Nos. (002-83672) and (811-03737)
	Post-Effective Amendment No. 92

Ladies and Gentlemen:

Pursuant to Rule 8b-16 under the Investment Company Act of 1940, as amended, Regulation S-T and Rule 485(b) under the Securities Act of 1933, as amended, transmitted herewith on behalf of the trust is Post-Effective Amendment No. 92 to the trust's current effective Registration Statement on Form N-1A. This transmission contains a conformed signature page, the manually signed original of which, executed pursuant to a Power of Attorney dated February 1, 2009, is maintained at the offices of the trust. This filing also includes a conformed copy of the manually signed consent of the trust's independent registered public accounting firm, the original of which is maintained at the offices of the trust.

This filing includes the Prospectus and Statement of Additional Information for Fidelity Institutional Short-Intermediate Government Fund. The fund's Prospectus and SAI, as filed herein, have been tagged to indicate modifications and editorial changes made since the filing of Post-Effective Amendment No. 91. The fund may be marketed through banks, savings and loan associations, or credit unions.

The principal purpose of this filing is to update the fund's financial information for the fiscal year ended November 30, 2009.

This filing also serves to reflect Staff comments on Post-Effective Amendment No. 91, update standard disclosure, and implement editorial changes.

An effective date of January 29, 2010 is elected by the trust pursuant to Rule 485(b).

Please contact Jamie Plourde at (617) 563-1375 in connection with any questions or comments regarding this filing.

|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||	Very truly yours,
	/s/ Catherine Conlin
	Catherine Conlin
	Legal Product Group