Guggenheim Funds Distributors, Inc.
                           2455 Corporate West Drive
                             Lisle, Illinois 60532


                                October 26, 2011


Securities and Exchange Commission
100 F Street, N.E.
Washington, DC 20549

          Re:     Guggenheim Defined Portfolios, Series 805
                              File No. 333-174875

Ladies/Gentlemen:

     The undersigned, Guggenheim Defined Portfolios, Series 805 (the "Trust"),
by Guggenheim Funds Distributors, Inc., as the sponsor and depositor of the
Trust and of the units covered by the subject Registration Statement, pursuant
to the provisions of Rule 461 of the General Rules and Regulations of the
Securities and Exchange Commission under the Securities Act of 1933, hereby
respectfully requests that the Securities and Exchange Commission consent to the
filing of the amendment to the Registration Statement and grant acceleration of
the effectiveness of said Registration Statement, as amended, so that the same
may become effective as early as practicable on October 31, 2011 or as soon
thereafter as possible.

                                                               Very truly yours,

                                       Guggenheim Defined Portfolios, Series 805

                                         By: Guggenheim Funds Distributors, Inc.


                                                          By: /S/ Kevin Robinson
                                                              ------------------
                                                                  Kevin Robinson
                         Senior Managing Director, General Counsel and Secretary