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

Dana C. Gavenda, President and Chief Executive Officer, and Kevin D. Maroney, Chief Operating Officer and Chief Financial Officer of FSB Bancorp, Inc. (the “Company”) each certify in their capacity as an officer of the Company that they have reviewed this Annual Report on Form 10-K of the Company for the fiscal year ended December 31, 2016 and that to the best of their knowledge:

(1) the report fully complies with the requirements of Section 13(a) 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.

The purpose of this statement is solely to comply with Title 18, Chapter 63, Section 1350 of the United States Code, as amended by Section 906 of the Sarbanes-Oxley Act of 2002.

Date:	March 16, 2017	/s/ Dana C. Gavenda
		Dana C. Gavenda
		President and Chief Executive Officer
Date:	March 16, 2017	/s/ Kevin D. Maroney
		Kevin D. Maroney
		Chief Operating Officer and Chief Financial Officer