EXHIBIT 31.2

                           Certification by Donald D. Humphreys
                    Pursuant to Securities Exchange Act Rule 13a-14(a)

I, Donald D. Humphreys, certify that:

  1.  I have reviewed this quarterly report on Form 10-Q of Exxon Mobil
      Corporation;

  2.  Based on my knowledge, this report does not contain any untrue statement
      of a material fact or omit to state a material fact necessary to make
      the statements made, in light of the circumstances under which such
      statements were made, not misleading with respect to the period covered
      by this report;

  3.  Based on my knowledge, the financial statements, and other financial
      information included in this report, fairly present in all material
      respects the financial condition, results of operations and cash flows
      of the registrant as of, and for, the periods presented in this report;

  4.  The registrant's other certifying officers and I are responsible for
      establishing and maintaining disclosure controls and procedures (as
      defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the
      registrant and have:

     (a)  Designed such disclosure controls and procedures, or caused such
          disclosure controls and procedures to be designed under our
          supervision, to ensure that material information relating to the
          registrant, including its consolidated subsidiaries, is made known
          to us by others within those entities, particularly during the
          period in which this report is being prepared;

    (b)  [Paragraph omitted pursuant to SEC Release Nos. 33-8238 and 34-47986]

    (c)  Evaluated the effectiveness of the registrant's disclosure controls
         and procedures and presented in this report our conclusions about the
         effectiveness of the disclosure controls and procedures, as of the
         end of the period covered by this report based on such evaluation;
         and

    (d)  Disclosed in this report any change in the registrant's internal
         control over financial reporting that occurred during the
         registrant's most recent fiscal quarter (the registrant's fourth
         fiscal quarter in the case of an annual report) that has materially
         affected, or is reasonably likely to materially affect, the
         registrant's internal control over financial reporting; and

  5.  The registrant's other certifying officers and I have disclosed, based
      on our most recent evaluation of internal control over financial
      reporting, to the registrant's auditors and the audit committee of the
      registrant's board of directors (or persons performing the equivalent
      functions):

    (a)  All significant deficiencies and material weaknesses in the design or
         operation of internal control over financial reporting which are
         reasonably likely to adversely affect the registrant's ability to
         record, process, summarize and report financial information; and

    (b)  Any fraud, whether or not material, that involves management or other
         employees who have a significant role in the registrant's internal
         control over financial reporting.


Date: August 13, 2003
                                         /s/ Donald D. Humphreys
                                       _______________________________
                                       Donald D. Humphreys
                                       Vice President and Controller
                                       (Principal Accounting Officer)