Chapman and Cutler LLP                                  111 West Monroe Street
                                                        Chicago, Illinois  60603


                                 March 30, 2020




Mark Cowan
U.S. Securities and Exchange Commission
Division of Investment Management
Disclosure Review Office
100 F Street, N.E.
Washington, D.C. 20549



     Re:                           FT 8663
          Municipal Advantage Closed-End and ETF Portfolio, Series 59
                                 (the "Trust")
                      CIK No. 1799247 File No. 333-236936
--------------------------------------------------------------------------------

Dear Mr. Cowan:

      We  received  your  comments  regarding the Registration Statement for the
above captioned Trust. This letter serves to respond to your comments.

COMMENTS

Registration Statement
----------------------

      1.  BECAUSE  THE  FINAL REGISTRATION STATEMENT FOR THE TRUST WILL BE FILED
AFTER  APRIL  1,  2020,  PLEASE  INCLUDE  HYPERLINKS  FOR THE EXHIBITS AND OTHER
INFORMATION INCORPORATED BY REFERENCE IN THE REGISTRATION STATEMENT, IF PUBLICLY
AVAILABLE ON EDGAR. SEE RULES 411 UNDER THE SECURITIES ACT OF 1933 AND 0-4 UNDER
THE  INVESTMENT  COMPANY  ACT  OF  1940.  THE STAFF NOTES THAT ALL EXHIBIT LISTS
(INCLUDING THE ONE REQUIRED IN PART C) MUST INCLUDE LINKS TO EVERY EXHIBIT FILED
WITH  THE REGISTRATION STATEMENT OR INCORPORATED BY REFERENCE. SEE INSTRUCTION 5
TO ITEM 28 OF FORM N-1A AND RULE 102(D) AND RULE 105(D) OF REGULATION S-T.

      Response:  The  final Registration Statement for the Trust will be updated
in accordance with this comment.

Risk Factors
------------

      2.  IF THE TRUST WILL HAVE MATERIAL EXPOSURE TO THE MUNICIPAL BONDS ISSUED
BY  ANY  JURISDICTION  EXPERIENCING  FINANCIAL  DISTRESS,  PLEASE  IDENTIFY THAT
JURISDICTION AND ADD RELEVANT RISK DISCLOSURE.

      Response: The Trust does not expect to have material exposure to municipal
securities issued by any jurisdiction experiencing financial distress.

      3. THE STAFF NOTES THAT SIGNIFICANT MARKET EVENTS HAVE OCCURRED SINCE THIS
REGISTRATION  STATEMENT  WAS  FILED AS A RESULT OF THE COVID-19 PANDEMIC. PLEASE
CONSIDER  WHETHER THE TRUST'S DISCLOSURES, INCLUDING RISK DISCLOSURES, SHOULD BE
REVISED BASED ON HOW THESE EVENTS ARE AFFECTING BOTH DEBT AND EQUITY MARKETS. IF
THE  TRUST  BELIEVES  THAT NO ADDITIONAL DISCLOSURE IS WARRANTED, PLEASE EXPLAIN
WHY NOT SUPPLEMENTALLY.

      Response:  The  following  disclosure  will  be  included  as  the  second
paragraph of the "Current Economic Conditions" risk:

      Local, regional or global events such as war, acts of terrorism, spread of
      infectious  diseases  or  other public health issues, recessions, or other
      events  could  have  a  significant  negative  impact on the Trust and its
      investments. Such events may affect certain geographic regions, countries,
      sectors  and  industries more significantly than others. Such events could
      adversely  affect  the  prices  and  liquidity  of  the  Trust's portfolio
      securities  and  could  result  in disruptions in the trading markets. Any
      such circumstances could have a materially negative impact on the value of
      the  Trust's  Units  and result in increased market volatility. The recent
      outbreak  of  a  respiratory  disease  designated  as  COVID-19  was first
      detected  in  China  in  December  2019. The global economic impact of the
      COVID-19  outbreak  is  impossible  to  predict but is expected to disrupt
      manufacturing,  supply  chains  and sales in affected areas and negatively
      impact  global  economic  growth prospects. The COVID-19 outbreak has also
      caused  significant  volatility  and declines in global financial markets,
      which  have  caused  losses  for  investors.  The  impact  of the COVID-19
      outbreak may be short term or may last for an extended period of time, and
      in  either  case  could  result  in  a  substantial  economic  downturn or
      recession.

      Additionally,  the  following  disclosure  will  be  included as the final
paragraph of the "Municipal Bonds" risk:

      The  costs  associated  with  combatting  the  COVID-19  pandemic  and the
      negative  impact  on  tax  revenues  has  adversely affected the financial
      condition  of  many states and political subdivisions. The effects of this
      pandemic  could affect the ability of states and political subdivisions to
      make  payments on debt obligations when due and could adversely impact the
      value of their bonds, which could negatively impact the performance of the
      Trust.

      4. PLEASE CONSIDER WHETHER "INTEREST RATE RISK" SHOULD BE UPDATED IN LIGHT
OF CURRENT EVENTS.

      Response: The Trust believes that the risks related to current events have
been disclosed in the "Current Economic Conditions" risk.

      We appreciate your prompt attention to this Registration Statement. If you
have  any  questions  or comments or would like to discuss our responses to your
questions  please  feel  free  to contact Brian D. Free at (312) 845-3017 or the
undersigned at (312) 845-3721.

                                                    Very truly yours,

                                                    CHAPMAN AND CUTLER LLP


                                                 By /s/ Daniel J. Fallon
                                                    ________________________
                                                    Daniel J. Fallon