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Exhibit 32.1

CERTIFICATIONS OF PRINCIPAL EXECUTIVE OFFICER AND PRINCIPAL FINANCIAL OFFICER PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Matthew M. Cain, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report on Form 10-Q of Couchbase, Inc. for the period ended April 30, 2025 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, and that the information contained in such Quarterly Report on Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Couchbase, Inc.

Date: June 4, 2025			By:			/s/ MATTHEW M. CAIN
			Name:			Matthew M. Cain
			Title:			Chair, President and Chief Executive Officer
						(Principal Executive Officer)

I, Bill Carey, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report on Form 10-Q of Couchbase, Inc. for the period ended April 30, 2025 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, and that the information contained in such Quarterly Report on Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Couchbase, Inc.

Date: June 4, 2025			By:			/s/ BILL CAREY
			Name:			Bill Carey
			Title:			Vice President, Interim Chief Financial Officer and Chief Accounting Officer
						(Principal Financial Officer and Principal Accounting Officer)