Richard J. Kolencik Assistant Secretary and General Attorney       5555 San Felipe (77056-2799) P.O. Box 4813 (77210-4813) Houston, Texas Telephone 713/296-2535 E-Mail:  rjkolencik@marathonoil.com

   April 3, 2008

Ms. Sandy Eisen

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

Form 10-K for Fiscal Year Ended December 31, 2007

Filed February 29, 2008

File No. 1-5153

Dear Ms. Eisen:

This is to confirm our conversation today with respect to Marathon Oil Corporation’s proposed date to file its response to the SEC’s comment letter dated March 31, 2008.  As discussed, Marathon intends to file its response on or before Friday, April 25, 2008.  This date was acceptable to you.

Thank you for your consideration in this matter.  Please call me at 713-296-2535, if you have any questions regarding this submission.

Very truly yours,

/s/  Richard J. Kolencik

Richard J. Kolencik

Assistant Secretary and General Attorney

RJK/ca

211593

cc: Chris White

Branch Chief