EX-32.1

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Exhibit 32.1

CERTIFICATIONS 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

In connection with the Quarterly Report on Form 10-Q of Korro Bio, Inc. (the “Company”) for the period ended March 31, 2024 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned hereby certify, pursuant to 18 U.S.C. Section 1350, that, to the best of their knowledge:

(1)

the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2)

the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

    /s/ Ram Aiyar 

   

    Ram Aiyar

   

    President and Chief Executive Officer

   

    (Principal Executive Officer)

   

Dated: May 14, 2024

    /s/ Vineet Agarwal

   

    Vineet Agarwal

   

    Chief Financial Officer

   

    (Principal Financial and Accounting Officer)

   

Dated: May 14, 2024