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                                                            April 10, 2025

Christopher Hemmeter
Chief Executive Officer
Thayer Ventures Acquisition Corp II
25852 McBean Parkway
Suite 508
Valencia, CA 91355

       Re: Thayer Ventures Acquisition Corp II
           Amendment No. 1 to Registration Statement on Form S-1
           Filed April 3, 2025
           File No. 333-285830
Dear Christopher Hemmeter:

     We have reviewed your amended registration statement and have the
following
comments.

        Please respond to this letter by amending your registration statement
and providing
the requested information. If you do not believe a comment applies to your
facts and
circumstances or do not believe an amendment is appropriate, please tell us why
in your
response.

       After reviewing any amendment to your registration statement and the
information
you provide in response to this letter, we may have additional comments. Unless
we note
otherwise, any references to prior comments are to comments in our March 24,
2025, letter.

Amendment No. 1 to Registration Statement on Form S-1
Cover Page

1.     We note your response to prior comment 1. We note that you may seek to
extend the
       time to complete a business combination beyond 21 months. Please
disclose whether
       there are any limitations on extensions, including the number of times
you may seek
       to extend. Please see Item 1602(b)(4) of Regulation S-K.
Part II - Information not Required in Prospectus
Exhibits and Financial Statement Schedules, page II-2

2.     Please reconcile your disclosure on page 20 that shares purchased "in
compliance with
       the requirements of Rule 14e-5 under the Exchange Act would not be voted
in favor
 April 10, 2025
Page 2

       of approving the business combination transaction" with clause 1 of the
letter
       agreement filed as Exhibit 10.4.
Consent of Independent Registered Public Accounting Firm, page 1

3.     We note that the most recent auditor's consent dated April 3, 2025
refers to an audit
       report dated March 14, 2025, when the audit report included in this
filing is dated
       April 3, 2025. In your next amendment, please provide an auditor's
consent that refers
       the correct audit report date.
       Please contact Babette Cooper at 202-551-3396 or Wilson Lee at
202-551-3468 if you
have questions regarding comments on the financial statements and related
matters. Please
contact Stacie Gorman at 202-551-3585 or Ruairi Regan at 202-551-3269 with any
other
questions.



                                                            Sincerely,

                                                            Division of
Corporation Finance
                                                            Office of Real
Estate & Construction
cc:   John T. McKenna, Esq.
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