**EXHIBIT 31.1**

CERTIFICATION****AS ADOPTED PURSUANT TO  SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

| I, Craig H. Stevenson, Jr.,   certify that: |
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|                                        | 1. | I   have reviewed this report   on Form 10-Q of OMI Corporation; |
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|                                        | 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; |
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|                                        | 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; |
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|                                        | 4. | The   registrant’s other certifying officer 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: |
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|                                        |   |   | (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; |
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|                                        |   |   | (b)   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 |
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|                                        |   |   | (c)   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 this 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 |
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|                                        | 5. | The   registrant’s other certifying officer 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): |
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|                                        |   |   | (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 |
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|                                        |   |   | (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 9, 2004 |   | By:    | /s/   CRAIG H. STEVENSON, JR.                                                      |
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|   |                |   |   |                                                                                    |
|   |           |   |   | **Craig H.   Stevenson, Jr.    Chairman of the Board and Chief Executive Officer** |