{Marathon Oil Corporation Logo]

Richard J. Kolencik

Assistant General Counsel and Assistant Secretary

Marathon Oil Corporation

5555 San Felipe Street

Houston, Texas 77056

Telephone  713.296.2535

Fax  713.296.4227

rjkolencik@marathonoil.com

October 12, 2011

Ms. Caroline Kim

Staff Attorney

United States Securities and Exchange Commission

Division of Corporate Finance

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

Washington, DC 20549

RE:           Marathon Oil Corporation

Response to SEC Letter dated September 29, 2011

Annual Report on 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 September 29, 2011 comment letter of the U.S. Securities and Exchange Commission will be due on or before Wednesday, October 26, 2011.  Thank you for your consideration.

Very truly yours,

/s/ Richard J. Kolencik

Richard J. Kolencik

RJK/ca