As filed with the Securities and Exchange Commission on February 20, 2013
================================================================================
                                            1933 Act Registration No. 333-182308
                                             1940 Act Registration No. 811-22717

                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933                      [ ]
Post-Effective Amendment No. __                                              [ ]
Post-Effective Amendment No. 6                                               [X]
                                     and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940              [ ]
Amendment No. 8                                                              [X]


                      FIRST TRUST EXCHANGE-TRADED FUND VI
               (Exact name of registrant as specified in charter)
                       120 East Liberty Drive, Suite 400
                            Wheaton, Illinois 60187
              (Address of Principal Executive Offices) (Zip Code)


       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (800) 621-1675

                       W. Scott Jardine, Esq., Secretary
                      First Trust Exchange-Traded Fund VI
                           First Trust Advisors L.P.
                       120 East Liberty Drive, Suite 400
                            Wheaton, Illinois 60187
                    (Name and Address of Agent for Service)

                                    Copy to:
                               Eric F. Fess, Esq.
                             Chapman and Cutler LLP
                             111 West Monroe Street
                            Chicago, Illinois 60603


It is proposed that this filing will become effective (check appropriate box):

[X] immediately upon filing pursuant to paragraph (b)
[ ] on ___________ pursuant to paragraph (b)
[ ] 60 days after filing pursuant to paragraph (a)(1)
[ ] on (date) pursuant to paragraph (a)(1)
[ ] 75 days after filing pursuant to paragraph (a)(2)
[ ] on (date) pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

[ ] this post-effective amendment designates a new effective date for a
    previously filed post-effective amendment.





      This Registration Statement relates to Multi-Asset Diversified Income
Index Fund and First Trust NASDAQ Technology Dividend Index Fund, each a series
of the Registrant.





                                   SIGNATURES

      Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940, the Registrant certifies that it meets all of
the requirements for effectiveness of this Registration Statement under Rule
485(b) under the Securities Act of 1933 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, duly authorized in the
City of Wheaton, and State of Illinois, on the 20th day of February, 2013.

                                          FIRST TRUST EXCHANGE-TRADED FUND VI



                                 By:   /s/ Mark R. Bradley
                                       ---------------------------------------
                                       Mark R. Bradley, President and Chief
                                       Executive Officer


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



                                                                        
SIGNATURE                               TITLE                                 DATE
                                        President and Chief Executive         February 20, 2013
/s/ Mark R. Bradley                     Officer
-------------------------------------
    Mark R. Bradley

                                        Treasurer, Chief Financial Officer    February 20, 2013
/s/ James M. Dykas                      and Chief Accounting Officer
-------------------------------------
    James M. Dykas

                                                         )
James A. Bowen*                                  Trustee )
                                                         )
                                                         )
Richard E. Erickson*                             Trustee )
                                                         )
                                                         )
Thomas R. Kadlec*                                Trustee )                    BY: /s/ W. Scott Jardine
                                                         )                        ------------------------------
                                                         )                              W. Scott Jardine
Robert F. Keith*                                 Trustee )                              Attorney-In-Fact
                                                         )                              February 20, 2013
                                                         )
Niel B. Nielson*                                 Trustee )
                                                         )


*  Original powers of attorney authorizing James A. Bowen, W. Scott Jardine,
   Mark R. Bradley, Eric F. Fess and Kristi A. Maher to execute Registrant's
   Registration Statement, and Amendments thereto, for each of the trustees of
   the Registrant on whose behalf this Registration Statement is filed, were
   previously executed, filed as an exhibit and are incorporated by reference
   herein.





                               INDEX TO EXHIBITS

(101) Risk/return summary in interactive data format