SECURITIES AND EXCHANGE COMMISSION
                     WASHINGTON, D.C.  20549

                            FORM S-6

 For Registration Under the Securities Act of 1933 of Securities
       of Unit Investment Trusts Registered on Form N-8B-2

A.   Exact Name of Trust:             FT 8667

B.   Name of Depositor:               FIRST TRUST PORTFOLIOS L.P.

C.   Complete Address of Depositor's  120 East Liberty Drive
     Principal Executive Offices:     Suite 400
                                      Wheaton, Illinois  60187

D.   Name and Complete Address of
     Agents for Service:              FIRST TRUST PORTFOLIOS L.P.
                                      Attention:  James A. Bowen
                                      120 East Liberty Drive
                                      Suite 400
                                      Wheaton, Illinois  60187

                                      CHAPMAN & CUTLER LLP
                                      Attention: Eric F. Fess
                                      111 West Monroe Street
                                      Chicago, Illinois  60603

E.   Title and Amount of Securities
     Being Registered:                An indefinite number of
                                      Units pursuant to Rule
                                      24f-2 promulgated under
                                      the Investment Company Act
                                      of 1940, as amended.

F.   Approximate Date of Proposed
     Sale to the Public:              ____ Check if it is
                                      proposed that this filing
                                      will become effective on
                                      _____ at ____ p.m.
                                      pursuant to Rule 487.

     The registrant hereby amends this Registration Statement  on
such  date  or  dates as may be necessary to delay its  effective
date  until  the registrant shall file a further amendment  which
specifically  states  that  this  Registration  Statement   shall
thereafter  become effective in accordance with Section  8(a)  of
the  Securities  Act of 1933 or until the Registration  Statement
shall  become  effective on such date as the  Commission,  acting
pursuant to said Section 8(a), may determine.


                  Preliminary Prospectus Dated March 19, 2020

                                    FT 8667

       The  final  Prospectus  for  one  or  more  prior  Series of the Fund, as
referenced  below,  are  hereby  used  as a preliminary Prospectus for the above
stated  Series.  The narrative information and structure of the referenced final
Prospectus  or  Prospectuses will be substantially the same as that of the final
Prospectus  for  this Series. Information with respect to pricing, the number of
Units, dates and summary information regarding the characteristics of securities
to  be deposited in this Series is not now available and will be different since
each Series has a unique Portfolio. Accordingly the information contained herein
with  regard  to  the previous Series should be considered as being included for
informational  purposes  only. Ratings, if any, of the securities in this Series
are  expected  to  be  comparable  to  those  of the securities deposited in the
previous Series.

      A  registration  statement  relating  to  the units of this Series will be
filed  with  the  Securities  and  Exchange  Commission  but  has not yet become
effective.  Information  contained herein is subject to completion or amendment.
Such  Units  may not be sold nor may offers to buy be accepted prior to the time
the   registration  statement  becomes  effective.  This  Prospectus  shall  not
constitute  an  offer  to  sell or the solicitation of an offer to buy nor shall
there be any sale of the Units in any state in which such offer, solicitation or
sale  would  be  unlawful  prior  to  registration  or  qualification  under the
securities  laws  of  any  such  state. (Incorporated herein by reference is the
final  prospectus  for  FT 8614 (Registration No. 333-236550) as filed March 17,
2020 which shall be used as the preliminary Prospectus for the current series of
the Fund.)


                       CONTENTS OF REGISTRATION STATEMENT

ITEM A Bonding Arrangements of Depositor:

            First  Trust Portfolios L.P. is covered by a Broker's Fidelity Bond,
            in  the total amount of $2,000,000, the insurer being National Union
            Fire Insurance Company of Pittsburgh.

ITEM B This Registration Statement on Form S-6 comprises the following papers
and documents:

            The facing sheet

            The Prospectus

            The signatures

            Exhibits

                                      S-1


                                   SIGNATURES

      Pursuant   to  the  requirements  of  the  Securities  Act  of  1933,  the
Registrant,  FT 8667 has duly caused this Registration Statement to be signed on
its behalf by the undersigned, thereunto duly authorized, in the City of Wheaton
and State of Illinois on March 19, 2020.

                                 FT 8667
                                             (Registrant)

                                    By:  FIRST TRUST PORTFOLIOS L.P.
                                         ---------------------------
                                         Depositor


                                    By:  /s/ Elizabeth H. Bull
                                         ---------------------
                                         Senior Vice President

                                      S-2


      Pursuant to the requirements of the Securities Act of 1933, this Amendment
to the Registration Statement has been signed below by the following person in
the capacity and on the date indicated:



Name                 Title*                                 Date
----                 -----                                  ----
                                                      
James A. Bowen       Director of The Charger Corporation,   )
                     the General Partner of First Trust     )
                     Portfolios L.P., and Chief Executive   )
                     Officer of First Trust Portfolios      )By: /s/ Elizabeth H. Bull
                     L.P.                                   )    ---------------------
                                                            )    Attorney-in-Fact**
James M. Dykas       Chief Financial Officer of First       )    March 19, 2020
                     Trust Portfolios L.P.                  )
                                                            )
Christina Knierim    Controller of First Trust Portfolios   )
                     L.P.                                   )


*     The title of the person named herein represents his or her capacity in and
      relationship to First Trust Portfolios L.P., the Depositor.

**    Executed  copies  of  the  related  powers of attorney were filed with the
      Securities  and Exchange Commission in connection with the Amendment No. 1
      to  Form  S-6  of  FT  8556  (File  No. 333-236093) and the same is hereby
      incorporated herein by this reference.

                                      S-3


                               CONSENT OF COUNSEL

      The  consent  of counsel to the use of its name in the Prospectus included
in this Registration Statement will be contained in its respective opinion to be
filed as Exhibit 3.1 of the Registration Statement.

                        CONSENT OF DELOITTE & TOUCHE LLP

      The  consent  of  Deloitte  & Touche LLP to the use of its name and to the
reference to such firm in the Prospectus included in this Registration Statement
will be filed by amendment.

                      CONSENT OF FIRST TRUST ADVISORS L.P.

      The  consent  of  First  Trust Advisors L.P. to the use of its name in the
Prospectus  included  in the Registration Statement will be filed as Exhibit 4.1
to the Registration Statement.

                                      S-4


                                 EXHIBIT INDEX

1.1      Form  of Standard Terms and Conditions of Trust for FT 4484 and certain
         subsequent Series among First Trust Portfolios L.P., as
         Depositor,  The  Bank  of  New  York  Mellon,  as  Trustee, First Trust
         Advisors  L.P.,  as Evaluator and Portfolio Supervisor and FTP Services
         LLC,  as  FTPS  Unit  Servicing  Agent  (incorporated  by  reference to
         Amendment No. 1 to Form S-6 [File No. 333-191558] filed on behalf of FT
         4484).

1.1.1*   Form  of Trust Agreement for FT 8667 among First Trust Portfolios L.P.,
         as  Depositor,  The  Bank  of  New York Mellon, as Trustee, First Trust
         Advisors L.P., as Evaluator and Portfolio Supervisor.

1.2      Copy  of  Certificate  of Limited Partnership of Nike Securities, L.P.,
         predecessor  of  First Trust Portfolios L.P. (incorporated by reference
         to Amendment No. 1 to Form S-6 [File No. 333-230481] filed on behalf of
         FT 8001).

1.3      Copy  of  Amended  and  Restated  Limited Partnership Agreement of Nike
         Securities,   L.P.,   predecessor   of   First  Trust  Portfolios  L.P.
         (incorporated  by  reference  to  Amendment No. 1 to Form S-6 [File No.
         333-230481] filed on behalf of FT 8001).

1.4      Copy  of  Articles  of  Incorporation  of  Nike Securities Corporation,
         predecessor  to  The  Charger Corporation, the general partner of First
         Trust   Portfolios   L.P.,  Depositor  (incorporated  by  reference  to
         Amendment No. 1 to Form S-6 [File No. 333-230481] filed on behalf of FT
         8001).

1.5      Copy  of  By-Laws  of  The  Charger Corporation, the general partner of
         First  Trust  Portfolios  L.P., Depositor (incorporated by reference to
         Amendment No. 2 to Form S-6 [File No. 333-169625] filed on behalf of FT
         2669).

1.6      Underwriter Agreement (incorporated by reference to  Amendment No.  1
         to  Form  S-6 [File No. 33-42755] filed on behalf of  The First Trust
         Special Situations Trust, Series 19).

                                      S-5


2.2      Copy of Code of Ethics (incorporated by reference to Amendment No. 1 to
         Form S-6 [File No. 333-224320] filed on behalf of FT 7359).

3.1*     Opinion of counsel as to legality of securities being registered.

4.1*     Consent of First Trust Advisors L.P.

6.1      List  of Principal Officers of the Depositor (incorporated by reference
         to Amendment No. 1 to Form S-6 [File No. 333-236093] filed on behalf of
         FT 8556).

7.1      Powers  of Attorney executed by the Officers listed on page S-3 of this
         Registration Statement (incorporated by reference to Amendment No. 1 to
         Form S-6 [File No. 333-236093] filed on behalf of FT 8556).

___________________________________
* To be filed by amendment.

                                      S-6