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<P ALIGN="CENTER">UNITED STATES</P>


<P ALIGN="CENTER">SECURITIES AND EXCHANGE COMMISSION</P>


<P ALIGN="CENTER">Washington, D.C. 20549</P>


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<B><P ALIGN="CENTER">FORM 8-K</P>


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<B><P ALIGN="CENTER">CURRENT REPORT</P>


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<B><P ALIGN="CENTER">Pursuant to Section&nbsp;13 or 15(d) of the Securities Exchange Act of 1934</P>


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<P ALIGN="CENTER">Date of Report (Date of earliest event reported): <B>April 27, 2004</P>


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<B><P ALIGN="CENTER">&nbsp;</P>


<P ALIGN="CENTER">MARATHON OIL CORPORATION</P>


</B><P ALIGN="CENTER">(Exact name of registrant as specified in its charter)</P>


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<P ALIGN="CENTER"><CENTER><TABLE CELLSPACING=0 BORDER=0 CELLPADDING=7 WIDTH=581>


<TR><TD WIDTH="3%" VALIGN="TOP">&nbsp;</TD>


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<B><P ALIGN="CENTER">Delaware</B></TD>


<TD WIDTH="35%" VALIGN="TOP">


<B><P ALIGN="CENTER">1-5153</B></TD>


<TD WIDTH="30%" VALIGN="TOP">


<B><P ALIGN="CENTER">25-0996816</B></TD>


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<TD WIDTH="33%" VALIGN="TOP">


<P ALIGN="CENTER">(State or other jurisdiction of incorporation)</TD>


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<P ALIGN="CENTER">(Commission File Number)</TD>


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<P ALIGN="CENTER">(IRS Employer Identification No.)</TD>


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<P ALIGN="JUSTIFY">&nbsp;</P>


<P ALIGN="CENTER"><CENTER><TABLE CELLSPACING=0 BORDER=0 CELLPADDING=7 WIDTH=574>


<TR><TD WIDTH="3%" VALIGN="TOP">&nbsp;</TD>


<TD WIDTH="56%" VALIGN="TOP">


<B><P ALIGN="CENTER">5555 San Felipe Road, Houston, Texas</B></TD>


<TD WIDTH="4%" VALIGN="TOP">&nbsp;</TD>


<TD WIDTH="37%" VALIGN="TOP">


<B><P ALIGN="CENTER">77056-2723</B></TD>


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<P ALIGN="CENTER">(Address of principal executive offices)</TD>


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<P ALIGN="CENTER">(Zip Code)</TD>


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<P ALIGN="CENTER">Registrant's telephone number, including area code: (<B>713) 629-6600</P>


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<P ALIGN="CENTER">______________________________</P>


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<P ALIGN="CENTER">&nbsp;</P>


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<P ALIGN="CENTER">&nbsp;</P></B>


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<B><P>Item 7.&#9;</B></TD>


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<B><P>Financial Statements and Exhibits</B>.</TD>


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<TD WIDTH="85%" VALIGN="TOP">


<P ALIGN="JUSTIFY">(c) &#9;Exhibits.</TD>


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<P ALIGN="JUSTIFY">99.1&#9;Press Release dated April 27, 2004, issued by Marathon Oil Corporation.</TD>


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<B><P>Item 12.</B></TD>


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<B><P>Disclosure of Results of Operations and Financial Condition</B>.</TD>


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<P ALIGN="JUSTIFY">On April 27, 2004, Marathon Oil Corporation (Marathon) issued a press release announcing first quarter 2004 earnings.  The press release is being furnished as an exhibit to this report and is incorporated herein by reference.</TD>


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<B><P ALIGN="CENTER">SIGNATURE</B></TD>


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<P>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.</TD>


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<P ALIGN="JUSTIFY">MARATHON OIL CORPORATION</P>


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<P>Date: April 27, 2004</TD>


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<P ALIGN="RIGHT">By:</TD>


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<U><P>  /s/ A.G. Adkins&#9;&#9;</U></TD>


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<P>A.G. Adkins</TD>


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<TR><TD WIDTH="3%" VALIGN="TOP">&nbsp;</TD>


<TD WIDTH="27%" VALIGN="TOP">&nbsp;</TD>


<TD WIDTH="19%" VALIGN="TOP">&nbsp;</TD>


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<P>Vice President-Accounting and Controller</TD>


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</I><P>&nbsp;</P>


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<B><P ALIGN="CENTER">EXHIBIT INDEX</P>


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<B><U><P>Number</B></U></TD>


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<B><U><P>Exhibit</B></U></TD>


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<P ALIGN="CENTER">99.1</TD>


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<P ALIGN="JUSTIFY">Press Release dated April 27, 2004, announcing Marathon's financial results for the first quarter 2004.</TD>


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_
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):
April 27, 2004
MARATHON OIL CORPORATION
(Exact name of registrant as specified in its charter)
Delaware
1-5153
25-0996816
(State or other jurisdiction of incorporation)
(Commission File Number)
(IRS Employer 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 7.
Financial Statements and Exhibits
.
(c) 	Exhibits.
99.1	Press Release dated April 27, 2004, issued by Marathon Oil Corporation.
Item 12.
Disclosure of Results of Operations and Financial Condition
.
On April 27, 2004, Marathon Oil Corporation (Marathon) issued a press release announcing first quarter 2004 earnings.  The press release is being furnished as an exhibit to this report and is incorporated herein by reference.
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: April 27, 2004
By:
/s/ A.G. Adkins
A.G. Adkins
Vice President-Accounting and Controller
EXHIBIT INDEX
Number
Exhibit
99.1
Press Release dated April 27, 2004, announcing Marathon's financial results for the first quarter 2004.