POWER OF ATTORNEY

Know all by these presents that the undersigned, does hereby make, constitute
and appoint each of Serge Saxonov, Justin J. McAnear and Eric S. Whitaker, or
any one of them, as a true and lawful attorney-in-fact of the undersigned with
full powers of substitution and revocation, for and in the name, place and stead
of the undersigned (in the undersigned's individual capacity), to execute and
deliver such forms that the undersigned may be required to file with the U.S.
Securities and Exchange Commission as a result of the undersigned's ownership of
or transactions in securities of 10x Genomics, Inc. (i) pursuant to Section
16(a) of the Securities Exchange Act of 1934, as amended, including without
limitation, statements on Form 3, Form 4 and Form 5 (including any amendments
thereto) and (ii) in connection with any applications for EDGAR access codes,
including without limitation the Form ID. The 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 regard to his or her ownership of or transactions in securities
of 10x Genomics, Inc., unless earlier revoked in writing. The undersigned
acknowledges that Serge Saxonov, Justin J. McAnear and Eric S. Whitaker are not
assuming any of the undersigned's responsibilities to comply with Section 16 of
the Securities Exchange Act of 1934, as amended.


                                        By: /s/Shehnaaz Suliman
                                            ----------------------------
                                        Name: Shehnaaz Suliman


                                        Date: September 9, 2019