Exhibit 32.1

CERTIFICATION 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

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, John P. Walker, the Chief Executive Officer and President of Zosano Pharma Corporation (the “Company”), and Georgia Erbez, the Chief Financial Officer and Chief Business Officer of the Company, hereby certify that, to their knowledge:

1. The Annual Report on Form 10-K for the period ended December 31, 2017 of the Company (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.

Date: March 12, 2018	By:	/s/ John P. Walker
		John P. Walker
		Chief Executive Officer and President
		(Principal Executive Officer)
Date: March 12, 2018	By:	/s/ Georgia Erbez
		Georgia Erbez
		Chief Financial Officer and Chief Business Officer
		(Principal Financial Officer)