EX-99.906CERT

CERTIFICATIONS PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT

Certification Pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002; provided by the Chief Executive Officer and Chief Financial Officer, based on each such officer’s knowledge and belief.

The undersigned officers of Nuveen S&P 500 Buy-Write Income Fund (the “Registrant”), certify that, to the best of each such officer’s knowledge and belief:

1. The Form N-CSR of the Registrant for the period ended June 30, 2022 (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 Registrant.

Date: September 6, 2022

/s/ David J. Lamb

David J. Lamb

Chief Administrative Officer

(principal executive officer)

/s/ E. Scott Wickerham

E. Scott Wickerham

Vice President and Controller

(principal financial officer)