POWER OF ATTORNEY FOR SECTION 16 REPORTING PURPOSES

Know all by these presents, that the undersigned hereby constitutes
and appoints each of Steven Vattuone, Amit Khetan, William Weesner,
Charles Rogerson and Bianca Jean LaCaille, or any of them signing
singly, and with full power of substitution, as the undersigned's
true and lawful attorney-in-fact to:

(1) prepare, execute for and on behalf of the undersigned Forms 3, 4,
and 5 in accordance with Section 16(a) of the Securities Exchange Act
of 1934 and the rules thereunder, and any other forms or reports the
undersigned may be required to file in connection with the
undersigned's ownership, acquisition, or disposition of securities of
ON24, Inc. (the "Company"),

(2) do and perform any and all acts for and on behalf of the
undersigned which may be necessary or desirable to complete and
execute any such Form 3, 4, or 5, or other form or report, and timely
file such form or report with the United States Securities and
Exchange Commission and any stock exchange or similar authority, and

(3) take any other action of any type whatsoever in connection with
the foregoing, which, in the opinion of such attorney-in-fact, may be
of benefit to, in the best interest of, or legally require d by, the
undersigned, it being understood that the documents executed by such
attorney-in-fact on behalf of the undersigned pursuant to this Power
of Attorney shall be in such form and shall contain such terms and
conditions as such attorney-in-fact may approve in such attorney-in-
fact's discretion.

The undersigned hereby grants to each such attorney-in-fact full
power and authority to do and perform any and every act and thing
whatsoever requisite, necessary, or proper to be done in the exercise
of any of the rights and powers herein granted, as fully to all
intents and purposes as the undersigned might or could do if
personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact, or
such attorney-in-fact's substitute or substitutes, shall lawfully do
or cause to be done by virtue of this power of attorney and the
rights and powers herein granted. The undersigned acknowledges that
the foregoing attorney-in-fact, in serving in such capacity at the
request of the undersigned, is not assuming, nor is the Company
assuming, any of the undersigned's responsibilities to comply with
Section 16 of the Securities Exchange Act of 1934.

This Power of Attorney shall remain in full force and effect until
the undersigned is no longer required to file Forms 3, 4, and 5 with
respect to the undersigned's holdings of and transactions in
securities issued by the Company, unless earlier revoked by the
undersigned in a signed writing delivered to the foregoing attorneys-
in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney
to be executed as of 12/21/2021.

James Blackie