Anthony C. Wills

Senior Attorney

[Marathon Oil Corporation Letterhead]

5555 San Felipe Street

Houston, Texas 77056

Telephone  713.296.2571

Fax 713.296.4227

ACWills@marathonoil.com

December 22, 2011

Ms. Caroline Kim

Staff Attorney

United States Securities and Exchange Commission

Division of Corporation Finance

100 F Street, N.E., Mail Stop 7010

Washington, DC 20549

Re:	Marathon Oil Corporation
	Response to SEC Letter dated December 21, 2011 Form 10-K for Fiscal Year Ended December 31, 2010
	Filed February 28, 2011
	File No. 001-05153

Dear Ms. Kim:

This letter is to confirm our conversation today that Marathon Oil Corporation’s response letter to the December 21, 2011 comment letter of the U.S. Securities and Exchange Commission will be due on or before Friday, January 13, 2012.

Very truly yours,

/s/ Anthony C. Wills 

Anthony C. Wills