SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM 10-K/A
                                 AMENDMENT NO. 1

    ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
               ACT OF 1934 - For the fiscal year ended December 31, 2003

         Commission file number 1-640

                               NL INDUSTRIES, INC.
-------------------------------------------------------------------------------


             (Exact name of Registrant as specified in its charter)

           New Jersey                                          13-5267260
(State or other jurisdiction of                              (IRS Employer
 incorporation or organization)                            Identification No.)

5430 LBJ Freeway, Suite 1700, Dallas, Texas                    75240-2697
  (Address of principal executive offices)                     (Zip Code)

Registrant's telephone number, including area code:          (972) 233-1700

Securities registered pursuant to Section 12(b) of the Act:

                                                    Name of each exchange on
     Title of each class                               which registered

         Common stock                               New York Stock Exchange
       ($.125 par value)                            Pacific Stock Exchange

Securities registered pursuant to Section 12(g) of the Act:

                                      None.

Indicate by check mark whether the Registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months and (2) has been subject to such filing requirements for
the past 90 days. Yes X  No
                     ---   ---

Indicate by check mark if disclosure of delinquent  filers  pursuant to Item 405
of Regulation  S-K is not contained  herein,  and will not be contained,  to the
best of Registrant's  knowledge,  in definitive proxy or information  statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K.

Indicate  by check mark  whether  the  Registrant  is an  accelerated  filer (as
defined in Rule 12b-2 of the Securities Exchange Act).  Yes X  No
                                                           ---   ---

The  aggregate  market  value of the 7.2 million  shares of voting stock held by
nonaffiliates of NL Industries,  Inc. as of June 30, 2003 (the last business day
of the Registrant's most recently-completed  second fiscal quarter) approximated
$122.5 million.

As of February 27, 2004, 48,262,284 shares of the Registrant's common stock were
outstanding.

                       Documents incorporated by reference

The  information  required by Part III is  incorporated  by  reference  from the
Registrant's definitive proxy statement to be filed with the Commission pursuant
to  Regulation  14A not later  than 120 days  after the end of the  fiscal  year
covered by this report.



The  undersigned   Registrant  hereby  amends  the  following  items,  financial
statements, exhibits or other portions of its Annual Report on Form 10-K for the
year  ended  December  31,  2003 as set forth  below  and in the pages  attached
hereto:

Item 15. EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K.

Item No.                                    Exhibit Index

  31.1     Certification

  31.2     Certification

  99.1     Annual Report of the NL Industries,  Inc. Retirement Savings Plan on
           Form 11-K for the year ended December 31, 2003.




                                  SIGNATURE


     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
Registrant  has duly  caused  this  amendment  to be signed on its behalf by the
undersigned, thereunto duly authorized.



                                                   NL INDUSTRIES, INC.
                                                       (Registrant)



Dated:  June 29, 2004                  By:      /s/Gregory M. Swalwell
                                                ---------------------------
                                                Gregory M. Swalwell
                                                Vice President, Finance and
                                                Chief Financial Officer