Exhibit 32.3

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Robynne D. Sisco, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge, the Quarterly Report of Workday, Inc. on Form 10-Q for the fiscal quarter ended July 31, 2021, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Workday, Inc.

Date: August 26, 2021	By:	/s/ Robynne D. Sisco
		Robynne D. Sisco
		President and Chief Financial Officer
		(Principal Financial Officer)