As filed with the Securities and Exchange Commission on March 16, 2005
                         Registration No. 333 -________

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM S-8

             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

                       FIRST HORIZON NATIONAL CORPORATION
             (Exact name of registrant as specified in its charter)

         TENNESSEE                                        62-0803242
(State or other jurisdiction of                       (I.R.S. Employer
 incorporation or organization)                       Identification No.)

                               165 Madison Avenue
                            Memphis, Tennessee  38103
                                 (901) 523-4444
               (Address, including zip code, and telephone number,
       including area code, of registrant's principal executive offices)

              First Horizon National Corporation Savings Plan
                              (Full title of plan)

Harry A. Johnson, III                      With a copy to:
Executive Vice President and
    General Counsel                        Clyde A.  Billings, Jr.
First Horizon National Corporation         Senior Vice President, Assistant
165 Madison Avenue                         General Counsel and
Memphis, Tennessee  38103                  Corporate Secretary
(901) 523-5624                             First Horizon National Corporation
(Name, address, including zip code,        165 Madison Avenue
 and telephone number, including area      Memphis, TN  38103
 code, of agent for service)               (901) 523-5679

                         CALCULATION OF REGISTRATION FEE
=========================================================================
Title of      Amount to     Proposed Maxi-   Proposed Maxi-  Amount of
Securities    Be Regis-     mum Offering     mum Aggregate   Registration
To be         tered         Price per        Offering        Fee (1)
Registered                  Share (1)        Price (1)
----------    -----------   --------------   --------------  ------------
Common Stk*   5,000,000     $42.72           $213,600,000    $25,140.72
& Plan        shares
Interests(2)
=========================================================================
* Including related Rights

(1) Estimated and calculated pursuant to Rule 457(h)(1), based on the
    average of the high and low prices reported on the New York Stock
    Exchange for Registrant's stock on March 14, 2005.

(2) In addition, pursuant to Rule 416(c) under the Securities Act of 1933,
    as amended, this registration statement also covers an indeterminate
    amount of interests offered or sold pursuant to the employee benefit
    plan described herein.



Note on Filing History

     On October 30, 1995,  First  Horizon  National  Corporation  ("FHNC" or the
"Registrant")  filed a registration  statement on Form S-8 (File No.  33-63809),
registering  4,000,000 shares (after adjusting for two intervening stock splits)
of its common stock, par value $0.625 per share ("Common Stock"), for sale under
Registrant's First Horizon National  Corporation  Savings Plan,  formerly called
First Tennessee National Corporation Savings Plan and Trust (as amended to date,
the "Plan").  Reg. No. 33-63809 is the most recent,  and the only  still-active,
registration  statement  applicable  to the  Plan.  Registrant  is  filing  this
registration  statement to register 5,000,000  additional shares of Registrant's
Common Stock for sale under the Plan.

Note on Share Issuance

     The Registrant does not intend to sell original issue shares under the Plan
in connection  with the additional  shares  registered  under this  Registration
Statement.  The Plan and the Registrant  contemplate  that the Plan trustee will
purchase shares of Common Stock for the accounts of the participants on the open
market or otherwise from sources other than the Registrant.


     PART I The Section  10(a)  prospectus  relating to the Plan is omitted from
this Registration Statement pursuant to the Note to Part I of Form S-8.


                                     PART II
                 INFORMATION REQUIRED IN REGISTRATION STATEMENT

     As permitted  by  Instruction  E to Form S-8, the contents of  Registrant's
registration statement on Form S-8 (File No. 33-63809),  which was filed October
30,  1995,  covering  shares for sale  under the Plan,  as  updated  below,  are
incorporated  herein by reference.  In addition to the foregoing,  the following
information is also included in this registration statement:

Item 5.  Interests of Named Experts and Counsel

     KPMG LLP, the Registrant's independent accountants, have no interest in the
Registrant.

Item 6.  Indemnification of Directors and Officers

     Tennessee Code Annotated Sections  48-18-501 through 48-18-509  authorize a
corporation to provide for the indemnification of officers, directors, employees
and agents in terms sufficiently broad to permit  indemnification  under certain
circumstances for liabilities  (including  reimbursement for expenses  incurred)
arising  under the  Securities  Act of 1933,  as  amended.  FHNC has adopted the
provisions of the Tennessee  statute  pursuant to Article Six of its Bylaws.  In
addition,  FHNC has a directors' and officers'  liability insurance policy which
provides coverage  sufficiently  broad to permit  indemnification  under certain
circumstances for liabilities  (including  reimbursement for expenses  incurred)
arising under the Securities Act of 1933, as amended.

                                       2



     Tennessee Code Annotated,  Section 48-12-102,  permits the inclusion in the
charter of a Tennessee  corporation  of a provision,  with  certain  exceptions,
eliminating the personal  monetary  liability of directors to the corporation or
its shareholders for breach of the duty of care. FHNC has adopted the provisions
of the statute as Article 13 of its charter.

     The  shareholders  of FHNC have approved an amendment to Article Six of the
Bylaws  pursuant to which FHNC is required to  indemnify  each  director and any
officers  designated by the Board of  Directors,  and advance  expenses,  to the
maximum  extent not  prohibited by law. In accordance  with the  foregoing,  the
Board of Directors is authorized to enter into individual  indemnity  agreements
with the  directors  and such  officers.  Such  indemnity  agreements  have been
approved for all of the directors and certain officers.

Item 8.  Exhibits

All Exhibits are listed in the Exhibit Index at the end of this Part II.

Item 9.  Undertakings

(a) The undersigned registrant hereby undertakes:

    (1) To file, during any period in which offers or sales are being
        made, a post-effective amendment to this registration
        statement:

        (i) To include any prospectus required by Section
            10(a)(3) of the Securities Act of 1933;

       (ii) To reflect in the prospectus any fact or events
            arising after the effective date of the registration
            statement (or the most recent post-effective
            amendment thereof) which, individually or in the
            aggregate, represents a fundamental change in the
            information set forth in the registration statement;

      (iii) To include any material information with respect to
            the plan of distribution not previously disclosed in
            the registration statement or any material change to
            such information in the registration statement;

          Provided,  however,  that  paragraphs  (a)(1)(i) and (a)(1)(ii) do not
          apply if the  registration  statement  is on Form S-3 or Form S-8, and
          the information required to be included in a post-effective  amendment
          by those  paragraphs  is  contained in periodic  reports  filed by the
          registrant  pursuant to Section 13 or Section 15(d) of the  Securities
          Exchange  Act of  1934  that  are  incorporated  by  reference  in the
          registration statement.

                                       3



    (2) That, for the purpose of determining any liability
        under the Securities Act of 1933, each such
        post-effective amendment shall be deemed to be a new
        registration statement relating to the securities
        offered therein, and the offering of such securities
        at that time shall be deemed to be the initial bona
        fide offering thereof.

    (3) To remove from registration by means of a
        post-effective amendment any of the securities being
        registered which remain unsold at the termination of
        the offering.

(b) The undersigned registrant hereby undertakes that, for purposes of
    determining any liability under the Securities Act of 1933, each
    filing of the registrant's annual report pursuant to Section 13(a) or
    Section 15(d) of the Securities Exchange Act of 1934, (and, where
    applicable, each filing of an employee benefit plan's annual report
    pursuant to Section 15(d) of the Securities Exchange Act of 1934) that
    is incorporated by reference in the registration statement shall be
    deemed to be a new registration statement relating to the securities
    offered therein, and the offering of such securities at that time
    shall be deemed to be the initial bona fide offering thereof.

(c) Insofar as indemnification for liabilities arising under the
    Securities Act of 1933 may be permitted to directors, officers and
    controlling persons of the registrant pursuant to the foregoing
    provisions, or otherwise, the registrant has been advised that in the
    opinion of the Securities and Exchange Commission such indemnification
    is against public policy as expressed in the Act and is, therefore,
    unenforceable.  In the event that a claim for indemnification against
    such liabilities (other than the payment by the registrant of expenses
    incurred or paid by a director, officer or controlling person of the
    registrant in the successful defense of any action, suit or
    proceeding) is asserted by such director, officer or controlling
    person in connection with the securities being registered, the
    registrant will, unless in the opinion of its counsel the matter has
    been settled by controlling precedent, submit to a court of
    appropriate jurisdiction the question whether such indemnification by
    it is against public policy as expressed in the Act and will be
    governed by the final adjudication of such issue.

(d) Pursuant to the instruction to Item 8 of Form S-8 concerning Exhibit 5,
    in lieu of providing an opinion of counsel or Internal Revenue Service
    (IRS) determination letter concerning the compliance of the Plan with
    ERISA, the undersigned Registrant undertakes (i) to submit material
    amendments of the Plan to the IRS in a timely manner, and (ii) to make
    all changes required by the IRS in order to qualify the Plan under
    Section 401(a) of the Internal Revenue Code, as amended.

                                       4


                                   SIGNATURES

The Registrant.  Pursuant to the requirements of the Securities Act of 1933, the
registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-8 and has duly caused this registration
statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized, in the City of Memphis and State of Tennessee, on March 16, 2005.

FIRST HORIZON NATIONAL CORPORATION


By: /s/Marlin L. Mosby, III
       --------------------
       Marlin L. Mosby, III
       Executive Vice President and
       Chief Financial Officer

Pursuant to the  requirements of the Securities Act of 1933,  this  registration
statement has been signed by the following  persons in the capacities and on the
date indicated.

Signature                 Title                         Date
----------------------    ---------------------         --------------

J. Kenneth Glass*         Chairman of the Board,        March 16, 2005
J. Kenneth Glass          President, Chief Executive
                          Officer and a Director
                         (principal executive officer)

Marlin L. Mosby, III*     Executive Vice President      March 16, 2005
Marlin L. Mosby, III      and Chief Financial Officer
                         (principal financial officer)

James F. Keen*            Executive Vice President      March 16, 2005
James F. Keen             and Corporate Controller
                         (principal accounting officer)

Robert C. Blattberg*      Director                      March 16, 2005
Robert C. Blattberg

George E. Cates*          Director                      March 16, 2005
George E. Cates

Simon F. Cooper*          Director                      March 16, 2005
Simon F. Cooper

James A. Haslam, III*     Director                      March 16, 2005
James A. Haslam, III

R. Brad Martin*           Director                      March 16, 2005
R. Brad Martin

Vicki R. Palmer*          Director                      March 16, 2005
Vicki R. Palmer

                                       5



Michael D. Rose*          Director                      March 16, 2005
Michael D. Rose

Mary F. Sammons*          Director                      March 16, 2005
Mary F. Sammons

William B. Sansom*        Director                      March 16, 2005
William B. Sansom

Jonathan P. Ward*         Director                      March 16, 2005
Jonathan P. Ward

Luke Yancy III*           Director                      March 16, 2005
Luke Yancy III


*By: /s/Clyde A. Billings, Jr.
        ----------------------
        Clyde A. Billings, Jr.
        Attorney-in-Fact
        March 16, 2005


The Plan.  Pursuant to the requirements of the Securities Act of 1933,
the trustees (or other persons who administer the employee benefit plan)
have duly caused this registration statement to be signed on its behalf by
the undersigned, thereunto duly authorized, in the City of Memphis and State
of Tennessee, on March 16, 2005.

                                 FIRST HORIZON NATIONAL CORPORATION
                                 SAVINGS PLAN


                               By: /s/ Robert E. Ellis
                                  -------------------------------------
                                       Robert E. Ellis, Plan Committee
                                       Member and duly authorized
                                       signatory



                                       6


                                  EXHIBIT INDEX
                                  -------------

Exhibit 4.1

Amended  and  Restated  Charter  of  the  Corporation,  incorporated  herein  by
reference to Exhibit 3(i) to the Corporation's Quarterly Report on Form 10-Q for
the quarter ended 3-31-04.

Exhibit 4.2

Bylaws of the Corporation,  as amended and restated as of 1-18-05,  incorporated
herein by reference to Exhibit 3.2 to the  Corporation's  Annual  Report on Form
10-K for the year ended December 31, 2004.

Exhibit 4.3

Shareholder  Protection Rights Agreement,  dated as of October 20, 1998, between
the Corporation and First Tennessee Bank National Association,  as Rights Agent,
including as Exhibit A the forms of Rights  Certificate and Election to Exercise
and as Exhibit B the form of Articles  of  Amendment  designating  Participating
Preferred Stock, incorporated herein by reference to Exhibits 1, 2, and 3 to the
Corporation's Registration Statement on Form 8-A filed 10-23-98.

Exhibit 5

None.

In accordance with the exceptions specified in Item 8 of Form S-8:

(a) No opinion of counsel regarding the legality of the securities being
    registered hereunder is provided because the Plan and the Registrant
    contemplate that such securities will not include original issuance
    securities.

(b) No opinion of counsel concerning compliance of the Plan with ERISA is
    provided. The Registrant has submitted the Plan to the Internal Revenue
    Service (IRS) and received a favorable determination letter, and the
    Registrant has made the undertakings required by Item 8 of Form S-8,
    as set forth in Item 9(d) above.

Exhibit 23.1

Consent of Independent Accountants.

Exhibit 24.1

Power of Attorney executed by certain directors and officers of the Registrant.

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