UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 25

NOTIFICATION OF REMOVAL FROM LISTING AND/OR
REGISTRATION UNDER SECTION 12(b) OF THE
SECURITIES EXCHANGE ACT OF 1934.

Commission File Number                                         

Marathon Oil Corporation; NYSE Arca, Inc. (Formerly, Pacific Exchange)

(Exact name of Issuer as specified in its charter, and name of Exchange where security is listed and/or registered

5555 San Felipe Road, Houston, TX 77056 – 2723

Common Stock, poc value $1.00 per Share
(Description of class of securities)

Please place and X in the box to designate the rule provision relied upon to strike the class of securities from listing and registration:

o 17 CFR 240.12d2-2(a)(1)

o 17 CFR 240.12d2-2(a)(2)

o 17 CFR 240.12d2-2(a)(3)

o 17 CFR 240.12d2-2(a)(4)

o Pursuant to 17 CFR 240.12d2-2(b), the Exchange has complied with its rules to strike the class of securities from listing and/or withdraw registration on the Exchange.¹

þ Pursuant to 17 CFR 240.12d2-2(c), the Issuer has complied with the rules of the Exchange and the requirements of 17 CFR 240.12d2-2 (c) governing the voluntary withdrawal of the class of securities from listing and registration on the Exchange.

Pursuant to the requirements of the Securities Exchange Act of 1934, Marathon Oil Corporation (Name of Issuer of Exchange) certifies that it has reasonable grounds to believe that it meets all of the requirements for filing the Form 25 and has caused this notification to be signed on its behalf by the undersigned duly authorized person.

December 22, 2006		By		/s/ William F. Schwind, Jr.		Vice President, General Counsel and Secretary
Date				Name		Title