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                           June 1, 2021

       Roger Kahn
       President and Chief Executive Officer
       Bridgeline Digital, Inc.
       100 Sylvan Road
       Suite G-700
       Woburn, MA 01801

                                                        Re: Bridgeline Digital,
Inc.
                                                            Registration
Statement on Form S-3
                                                            Filed May 28, 2021
                                                            File No. 333-256638

       Dear Mr. Kahn:

              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
Katherine Wray, Staff Attorney, at 202-551-3483 with any questions.




                           Sincerely,


                           Division of Corporation Finance

                           Office of Technology
       cc:                                              Jessica Sudweeks