Fidelity (logo) Investments®||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Fidelity Management & Research Company
82 Devonshire Street
Boston MA 02109-3614
617 563 7000

||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| June 1, 2010

U.S. Securities & Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

Attn: File Room

RE:	Fidelity Aberdeen Street Trust (the trust):
	Fidelity Advisor Freedom 2005 Fund, Fidelity Advisor Freedom 2010 Fund, Fidelity Advisor Freedom 2015 Fund, Fidelity Advisor Freedom 2020 Fund, Fidelity Advisor Freedom 2025 Fund, Fidelity Advisor Freedom 2030 Fund, Fidelity Advisor Freedom 2035 Fund, Fidelity Advisor Freedom 2040 Fund, Fidelity Advisor Freedom 2045 Fund, Fidelity Advisor Freedom 2050 Fund, Fidelity Advisor Freedom Income Fund, Fidelity Freedom 2000 Fund, Fidelity Freedom 2005 Fund, Fidelity Freedom 2010 Fund, Fidelity Freedom 2015 Fund, Fidelity Freedom 2020 Fund, Fidelity Freedom 2025 Fund, Fidelity Freedom 2030 Fund, Fidelity Freedom 2035 Fund, Fidelity Freedom 2040 Fund, Fidelity Freedom 2045 Fund, Fidelity Freedom 2050 Fund, Fidelity Freedom Income Fund, Fidelity Freedom Index Income Fund, Fidelity Freedom Index 2000 Fund, Fidelity Freedom Index 2005 Fund, Fidelity Freedom Index 2010 Fund, Fidelity Freedom Index 2015 Fund, Fidelity Freedom Index 2020 Fund, Fidelity Freedom Index 2025 Fund, Fidelity Freedom Index 2030 Fund, Fidelity Freedom Index 2035 Fund, Fidelity Freedom Index 2040 Fund, Fidelity Freedom Index 2045 Fund, Fidelity Freedom Index 2050 Fund, Fidelity Freedom K Income Fund, Fidelity Freedom K 2000 Fund, Fidelity Freedom K 2005 Fund, Fidelity Freedom K 2010 Fund, Fidelity Freedom K 2015 Fund, Fidelity Freedom K 2020 Fund, Fidelity Freedom K 2025 Fund, Fidelity Freedom K 2030 Fund, Fidelity Freedom K 2035 Fund, Fidelity Freedom K 2040 Fund, Fidelity Freedom K 2045 Fund, Fidelity Freedom K 2050 Fund (the funds)
	File Nos. (033-43529) and (811-06440)

__________________________________________________________________________

Ladies and Gentlemen:

Transmitted herewith pursuant to Rule 497(j) under the Securities Act of 1933 is certification that the Prospectuses and Statements of Additional Information with respect to the above referenced funds do not differ from those filed in the most recent post-effective amendment, which was filed electronically.

||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||	Very truly yours,
	/s/ Scott C. Goebel
	Scott C. Goebel
	Secretary of the Trust