POWER OF ATTORNEY

	The undersigned hereby authorizes and designates each of Sylvia J. Kerrigan,
Richard J. Kolencik and Yvonne R. Kunetka (the "Attorneys") as his fully
authorized attorney for the purpose of signing and filing on behalf of the
undersigned all forms which are permitted or required to be filed pursuant to
Section 16 of the Securities Exchange Act of 1934 (the "Forms") concerning the
undersigned's interest in securities of Marathon Oil Corporation ("MOC") and/or
the undersigned's status with respect to MOC.  This Power of Attorney authorizes
each of the Attorneys to sign and file the Forms on behalf of the undersigned
from the date hereof until the undersigned ceases to be subject to Section 16 of
the Securities Exchange Act of 1934 by virtue of having been a director of MOC.

Signed in the City of Houston, State of Texas on October 28, 2009.


_/s/Gregory H. Boyce	___

Gregory H. Boyce