FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person *   KRAJECIK CATHERINE LEE 2. Date of Event Requiring Statement (Month/Day/Year) 12/01/2015 3. Issuer Name and Ticker or Trading Symbol MARATHON OIL CORP [MRO] (Last) (First) (Middle) C/O MARATHON OIL CORPORATION, 5555 SAN FELIPE ST 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Vice President (See Remarks) 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) HOUSTON, TX 77056 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5) Marathon Oil Corporation Common Stock 23,321 D Â

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Employee Stock Option (Right to Buy)	05/28/2011	05/28/2018	Common Stock	3,530	$ 32.06	D	Â
Employee Stock Option (Right to Buy)	05/27/2012	05/27/2019	Common Stock	4,315	$ 18.32	D	Â
Employee Stock Option (Right to Buy)	05/26/2013	05/26/2020	Common Stock	6,950	$ 19.03	D	Â
Employee Stock Option (Right to Buy)	05/26/2013	05/26/2020	Common Stock	2,071	$ 19.03	D	Â
Employee Stock Option (Right to Buy)	05/25/2014	05/25/2021	Common Stock	10,065	$ 33.06	D	Â
Employee Stock Option (Right to Buy)	08/31/2014	08/31/2021	Common Stock	7,392	$ 26.92	D	Â
Employee Stock Option (Right to Buy)	02/28/2015	02/28/2022	Common Stock	5,491	$ 35.06	D	Â
Employee Stock Option (Right to Buy)	08/31/2015	08/31/2022	Common Stock	7,304	$ 27.82	D	Â
Employee Stock Option (Right to Buy)	04/08/2014(1)	04/08/2023	Common Stock	6,467	$ 32.84	D	Â
Employee Stock Option (Right to Buy)	10/07/2014(2)	10/07/2023	Common Stock	6,633	$ 34.72	D	Â
Employee Stock Option (Right to Buy)	04/07/2015(3)	04/07/2024	Common Stock	19,544	$ 34.9	D	Â
Employee Stock Option (Right to Buy)	02/25/2016(4)	02/25/2025	Common Stock	17,575	$ 29.06	D	Â

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
KRAJECIK CATHERINE LEE C/O MARATHON OIL CORPORATION 5555 SAN FELIPE ST HOUSTON, TX 77056	Â	Â	  Vice President (See Remarks)	Â

Signatures

Elisa D. Watts, Attorney-in-Fact for Catherine L. Krajicek		12/08/2015
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Vests in cumulative annual installments of 2,155, 2,156 and 2,156 shares on April 8, 2014, 2015 and 2016, respectively.
(2)	Vests in cumulative annual installments of 2,211, 2,211 and 2,211 shares on October 7, 2014, 2015 and 2016, respectively.
(3)	Vests in cumulative annual installments of 6,514, 6,515 and 6,515 shares on April 7, 2015, 2016 and 2017, respectively.
(4)	Vests in cumulative annual installments of 5,858, 5,858 and 5,859 shares on February 25, 2016, 2017 and 2018, respectively.
  Remarks: Vice President-Corporate Development and Strategy

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