Exhibit 24

                               POWER OF ATTORNEY FOR
                          SECTION 16 REPORTING OBLIGATIONS

        Know all by these presents, that the undersigned hereby makes,
constitutes and appoints each of Justin Mirro and Daniel Huber, each acting
individually, as the undersigned's true and lawful attorney-in-fact, with full
power and authority as described below, to take the following actions on behalf
of and in the name, place and stead of the undersigned:

        (1) prepare, execute, and file on behalf of the undersigned Forms 3, 4,
and 5 (including any amendments thereto) with respect to the securities of
Kensington Capital Acquisition Corp. IV (the "Company"), with the United States
Securities and Exchange Commission, any stock exchange and the Company, as
considered necessary or advisable under Section 16(a) of the Securities
Exchange Act of 1934 (the "Exchange Act") and the rules and regulations
thereunder;

        (2) seek or obtain, as the undersigned's representative and on the
undersigned's behalf, information regarding transactions in the Company's
securities from any third party, including brokers and employee benefit plan
administrators and trustees, and the undersigned hereby authorizes any such
person to release any such information to such attorneys-in-fact and approves
and ratifies any such release of information; and

        (3) do and perform any and all other acts which in the discretion of
such attorney-in-fact are necessary or desirable for and on behalf of the
undersigned in connection with the foregoing.

        The undersigned acknowledges that:

        (1) this Power of Attorney authorizes, but does not require, each such
attorney-in-fact to act in their discretion on information provided to such
attorney-in-fact without independent verification of such information;

        (2) any documents prepared and/or executed by any such attorney-in-fact
on behalf of the undersigned pursuant to this Power of Attorney will be in such
form and will contain such information and disclosure as such attorney-in-fact,
in his or her discretion, deems necessary or desirable;

        (3) neither the Company nor any of such attorneys-in-fact assumes (i)
any liability for the undersigned's responsibility to comply with the
requirements of the Exchange Act, (ii) any liability of the undersigned for any
failure to comply with such requirements, or (iii) any obligation or liability
of the undersigned for profit disgorgement under Section 16(b) of the Exchange
Act; and

        (4) this Power of Attorney does not relieve the undersigned from
responsibility for compliance with the undersigned's obligations under the
Exchange Act, including without limitation the reporting requirements under
Section 16 of the Exchange Act.

        The undersigned hereby gives and grants each of the foregoing
attorneys-in-fact full power and authority to do and perform all and every act
and thing whatsoever necessary or appropriate to be done in the exercise of the
rights and powers granted by this Power of Attorney as fully to all intents and
purposes as the undersigned might or could do personally, hereby ratifying all
that each such attorney-in-fact, shall lawfully do or cause to be done for and
on behalf of the undersigned by virtue of this Power of Attorney.

        This Power of Attorney shall remain in full force and effect until
revoked by the undersigned in a signed writing delivered to each such attorney-
in-fact or until such earlier time as the undersigned is no longer required to
file Forms 3, 4, and 5 with respect to the Company.

        IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney
to be executed as of this 9th day of February 2022.

                                   /s/ Nicole Nason
                                  --------------------------------
                                  -- Signature

                                   Nicole Nason
                                  --------------------------------
                                  -- Print Name