UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT


     PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934


         Date of Report (Date of earliest event reported): MAY 23, 2002


                            MARATHON OIL CORPORATION
             (Exact name of registrant as specified in its charter)


                                                                               
              DELAWARE                                 1-5153                               25-0996816
    (State or other jurisdiction              (Commission File Number)                     (IRS Employer
          of incorporation)                                                             Identification No.)



  5555 SAN FELIPE ROAD, HOUSTON, TEXAS                               77056-2723
(Address of principal executive offices)                             (Zip Code)


       Registrant's telephone number, including area code: (713) 629-6600

                         ------------------------------






ITEM 5.           OTHER EVENTS.

                  On May 23, 2002, Marathon Oil Corporation ("Marathon") entered
into an underwriting agreement for the public offering of $450,000,000 aggregate
principal amount of its 5.375% Notes due 2007 (the "Notes"). The Notes are to be
issued under an Indenture dated February 26, 2002 between the Company and
JPMorgan Chase Bank, as Trustee, relating to senior debt securities of Marathon
(the "Senior Indenture"). Closing of the issuance and sale of the Notes is
scheduled for May 29, 2002.

ITEM 7.           FINANCIAL STATEMENTS AND EXHIBITS.

         (c)      Exhibits.

         1.1      Underwriting Agreement dated May 23, 2002 among Marathon and
                  J.P. Morgan Securities Inc. and Salomon Smith Barney Inc., as
                  representatives of the several Underwriters.

         1.2      Pricing Agreement dated May 23, 2002 among Marathon and J.P.
                  Morgan Securities Inc. and Salomon Smith Barney Inc., as
                  representatives of the several Underwriters.

         4.1      Officers' Certificate delivered pursuant to Sections 1.02,
                  2.01, 3.01 and 3.03 of the Senior Indenture dated as of May
                  29, 2002, providing for the issuance of Marathon's 5.375%
                  Notes due 2007.

         4.2      Form of Notes (included in Exhibit 4.1 above).

         5.1      Opinion of Baker Botts L.L.P.





                                       2




                                    SIGNATURE

                  Pursuant to the requirements of the Securities Exchange Act of
1934, the Registrant has duly caused this report to be signed on its behalf by
the undersigned hereunto duly authorized.



                                       MARATHON OIL CORPORATION




Date: May 29, 2002                     By: /s/ PAUL C. REINBOLT
                                          --------------------------------------
                                            Name: Paul C. Reinbolt
                                            Title: Vice President Finance &
                                                   Treasurer







                                  EXHIBIT INDEX

        Number    Exhibit
        ------    -------

         1.1      Underwriting Agreement dated May 23, 2002 among Marathon and
                  J.P. Morgan Securities Inc. and Salomon Smith Barney Inc., as
                  representatives of the several Underwriters.

         1.2      Pricing Agreement dated May 23, 2002 among Marathon and J.P.
                  Morgan Securities Inc. and Salomon Smith Barney Inc., as
                  representatives of the several Underwriters.

         4.1      Officers' Certificate delivered pursuant to Sections 1.02,
                  2.01, 3.01 and 3.03 of the Senior Indenture dated as of May
                  29, 2002, providing for the issuance of Marathon's 5.375%
                  Notes due 2007.

         4.2      Form of Notes (included in Exhibit 4.1 above).

         5.1      Opinion of Baker Botts L.L.P.