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                          December 8, 2023

       Jay Wright
       General Counsel
       Castellum, Inc.
       3 Bethesda Metro Center, Suite 700
       Bethesda, MD 20814

                                                        Re: Castellum, Inc.
                                                            Registration
Statement on Form S-3
                                                            Filed December 1,
2023
                                                            File No. 333-275840

       Dear Jay Wright:

              This is to advise you that we have not reviewed and will not
review your registration
       statement.

               Please refer to Rules 460 and 461 regarding requests for
acceleration. We remind you
       that the company and its management are responsible for the accuracy and
adequacy of their
       disclosures, notwithstanding any review, comments, action or absence of
action by the staff.

                                                        Please contact Rucha
Pandit at 202-551-6022 with any questions.




                          Sincerely,


                          Division of Corporation Finance

                          Office of Trade & Services
       cc:                                              Steven Lipstein