EXHIBIT 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Tidewater Inc. (the “company”) for the quarter ended September 30, 2025 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Quintin V. Kneen, President and Chief Executive Officer, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

1)	The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2)	The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the company.

Date:	November 10, 2025	/s/ Quintin V. Kneen
		Quintin V. Kneen
		President and Chief Executive Officer

A signed original of this written statement has been provided to the company and will be retained by the company and furnished to the Securities and Exchange Commission or its staff upon request.

The certification the registrant furnishes in this exhibit is not deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that Section. Registration Statements or other documents filed with the Securities and Exchange Commission shall not incorporate this exhibit by reference, except as otherwise expressly stated.

TIDEWATER INC 10-Q