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                          April 18, 2024

       Dennis P. Calvert
       Chief Executive Officer
       BioLargo, Inc.
       14921 Chestnut St.
       Westminster, CA 92683

                                                        Re: BioLargo, Inc.
                                                            Registration
Statement on Form S-1
                                                            Filed April 12,
2024
                                                            File No. 333-278669

       Dear Dennis P. Calvert:

              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 Juan
Grana at 202-551-6034 with any questions.




                          Sincerely,


                          Division of Corporation Finance

                          Office of Industrial Applications and

                          Services
       cc:                                              Gilbert Bradshaw, Esq.