EXHIBIT 4.1


            CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

     We consent to the reference to our firm under the caption
"Experts-Independent Registered Public Accounting Firm" and to the use of our
report dated September 8, 2011 in the Amendment No. 2 to the Registration
Statement (File No. 333-175766) and related Prospectus of Guggenheim Defined
Portfolios, Series 811.


                                                          /s/ Grant Thornton LLP
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                                                              GRANT THORNTON LLP


Chicago, Illinois
September 8, 2011