Exhibit 24.1

                                 POWER OF ATTORNEY

    The undersigned constitutes and appoints Joel Rubinstein, Henrikki Harsu,
Adam Berkaw, Fangzhou Ying and Christina Min, or any of them acting singly, as
the undersigned's true and lawful attorneys-in-fact and agents, with full power
of substitution and resubstitution, for the undersigned and in the undersigned's
name, place and stead, to sign any and all Securities and Exchange Commission
("SEC")statements of beneficial ownership of securities of dMY Technology Group,
Inc. IV (the "Company") on Schedule 13D as required under Section 13 and Forms
3, 4 and 5 as required under Section 16(a) of the Securities Exchange Act of
1934, as amended, and any amendments thereto, and to file the same with all
exhibits thereto, and other documents in connection therewith, with the SEC, the
Company and any stock exchange on which any of the Company's securities are
listed, granting unto said attorneys-in-fact and agents, and each of them, full
power and authority to do and perform each act and thing requisite and necessary
to be done under said Section 13 and Section 16(a), as fully and to all intents
and purposes as the undersigned might or could do in person, hereby ratifying
and confirming all that said attorneys-in-fact and agents, and each of them, may
lawfully do or cause to be done by virtue hereof.

    A copy of this power of attorney shall be filed with the SEC.  The
authorization set forth above shall continue in full force and effect until the
undersigned revokes such authorization by written instructions to the attorneys-
in-fact.

    The authority granted hereby shall in no event be deemed to impose or create
any duty on behalf of the attorneys-in-fact with respect to the undersigned's
obligations to file a Form ID, Schedule 13Ds and Forms 3, 4 and 5 with the SEC.


Dated: March 1, 2021

                                        /s/ Francesca Luthi
                                        --------------------------------------
                                        Francesca Luthi