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| (Mark One) |                                                                                   |
|------------|----------------------------------------------------------------------------------------|
| [X]        | QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)OF THE SECURITIES EXCHANGE ACT OF 1934 |
|       | For the Quarterly Period Ended June 30, 2011                                           |

| [   ] | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)OF THE SECURITIES EXCHANGE ACT OF 1934 |
|----------------------|-----------------------------------------------------------------------------------------|
|                 | For the transition period from _____ to _____                                           |

| Delaware                                                       | 25-0996816                           |
|----------------------------------------------------------------|--------------------------------------|
| (State or other jurisdiction of incorporation or organization) | (I.R.S. Employer Identification No.) |

| Large accelerated filer    x                                                                                                 | Accelerated filer    o         |
|---------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------|
| Non-accelerated filer      o     (Do not check if a smaller reporting company)  | Smaller reporting company  o                  |

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| Exhibit Number |                |                                                                                                                                                    |   | Incorporated by Reference |    | Filed Herewith |        | Furnished Herewith |
|----------------|---------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------|--------|---------------------------|---------|----------------|-------------|--------------------|
|           | Exhibit Description |                                                                                                                                                    | Form   |                      | Exhibit |           | Filing Date |               | SEC File No. |   |   |
| 2.1            |                | Separation and Distribution Agreement dated as of May 25, 2011 among Marathon Oil Corporation, Marathon Oil Company and Marathon Petroleum Corporation. |   | 8-K                       |    | 2.1            |        | 5/26/11            |   |   |   |   |   |   |
| 2.2++          |                | Purchase and Sale Agreement between Hilcorp Resources Holding, LP and Marathon Oil Company dated May 31, 2011                                           |   |                      |    |           |        |               |   |   |   | X |   |   |
| 3.1            |                | Amended and Restated By-Laws of Marathon Oil Corporation effective April 27, 2011.                                                                      |   | 8-K                       |    | 3.1            |        | 4/29/11            |   |   |   |   |   |   |
| 10.1           |                | Tax Sharing Agreement dated as of May 25, 2011 among Marathon Oil Corporation, Marathon Petroleum Corporation and MPC Investment LLC.                   |   | 8-K                       |    | 10.1           |        | 5/26/11            |   |   |   |   |   |   |
| 10.2           |                | Employee Matters Agreement dated as of May 25, 2011 among Marathon Oil Corporation and Marathon Petroleum Corporation.                                  |   | 8-K                       |    | 10.2           |        | 5/26/11            |   |   |   |   |   |   |
| 10.3           |                | Amendment to Employee Matters Agreement dated as of June 30, 2011 among Marathon Oil Corporation and Marathon Petroleum Corporation                     |   | 10-Q                      |    | 10.3           |        | 8/8/11             |   |   |   |   |   |   |
| 10.4           |                | Transition Services Agreement dated as of May 25, 2011 between Marathon Oil Corporation and Marathon Petroleum Corporation.                             |   | 8-K                       |    | 10.3           |        | 5/26/11            |   |   |   |   |   |   |
| 12.1           |                | Computation of Ratio of Earnings to Fixed Charges.                                                                                                      |   |  10-Q                |    |  12.1     |        | 8/8/11             |   |   |   |   |   |   |
| 31.1           |                | Certification of President and Chief Executive Officer pursuant to Rule 13(a)-14 and 15(d)-14 under the Securities Exchange Act of 1934.                |   |                      |    |           |        |               |   |   |   | X |   |   |
| 31.2           |                | Certification of Executive Vice President and Chief Financial Officer pursuant to Rule 13(a)-14 and 15(d)-14 under the Securities Exchange Act of 1934. |   |                      |    |           |        |               |   |   |   | X |   |   |
| 32.1           |                | Certification of President and Chief Executive Officer pursuant to 18 U.S.C. Section 1350.                                                              |   |  10-Q                |    |  32.1     |        |  8/8/11       |   |   |   |   |   |   |
| 32.2           |                | Certification of Executive Vice President and Chief Financial Officer pursuant to 18 U.S.C. Section 1350.                                               |   |  10-Q                |    | 32.2           |        | 8/8/11             |   |   |   |   |   |   |
| 101.INS        |                | XBRL Instance Document                                                                                                                                  |   | 10-Q                      |    | 101.INS        |        |  8/8/11       |   |   |   |   |   |   |
| 101.SCH        |                | XBRL Taxonomy Extension Schema                                                                                                                          |   | 10-Q                      |    | 101.SCH        |        | 8/8/11             |   |   |   |   |   |   |
| 101.CAL        |                | XBRL Taxonomy Extension Calculation Linkbase                                                                                                            |   | 10-Q                      |    | 101.CAL        |        | 8/8/11             |   |   |   |   |   |   |
| 101.PRE        |                | XBRL Taxonomy Extension Presentation Linkbase                                                                                                           |   | 10-Q                      |    | 101.PRE        |        | 8/8/11             |   |   |   |   |   |   |
| 101.LAB        |                | XBRL Taxonomy Extension Label Linkbase                                                                                                                  |   | 10-Q                      |    | 101.LAB        |        | 8/8/11             |   |   |   |   |   |   |
| 101.DEF        |                | XBRL Taxonomy Extension Definitions Linkbase                                                                                                            |   | 10-Q                      |    | 101.DEF        |        | 8/8/11             |   |   |   |   |   |   |

| ++ | Pursuant to a request for confidential treatment under Rule 24b-2 of the Securities Exchange Act of 1934, as amended, portions of this exhibit have been omitted from the publicly filed document and have been separately filed with the Securities and Exchange Commission. |
|----|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| October 18,  2011 | MARATHON OIL CORPORATION                  |
|-----------------------------|-------------------------------------------|
|                        |                                      |
|                        | By: /s/ Michael K. Stewart                |
|                        | Michael K. Stewart                        |
|                        | Vice President, Accounting and Controller |