Exhibit 32.1
MCDERMOTT INTERNATIONAL, INC.
Certification Pursuant to
Section 906 of the Sarbanes-Oxley Act of 2002
(Subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code)
Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (Subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code), I, Stephen M. Johnson, Chief Executive Officer of McDermott International, Inc., a Panamanian corporation (the “Company”), hereby certify, to my knowledge, that:
| (1) | the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2012 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and |
| (2) | information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. |
Dated: November 5, 2012
/s/ Stephen M. Johnson |
| Stephen M. Johnson |
Chairman of the Board of Directors, President and Chief Executive Officer |