Exhibit 32.1

CERTIFICATION

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 Form 10-K to the Annual Report of RBB Bancorp (the “Company”) on Form 10-K for the period ended December 31, 2021, as filed with the Securities and Exchange Commission on March 11, 2022 (the “Report”), I, David Morris, Interim President and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, to the best of my knowledge that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; 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: March 11, 2022	By:	/s/ David R. Morris
	David R. Morris
	Interim President and Chief Executive Officer