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

                                    FORM 8-K

                                 CURRENT REPORT

                Pursuant to Section 13 OR 15(d) of the Securities
                              Exchange Act of 1934

              Date of Report (Date of the earliest event reported)
                                   May 8, 2006
                                ----------------

                               NL Industries, Inc.
             ------------------------------------------------------
             (Exact name of Registrant as specified in its charter)

     Delaware                         1-640                       13-5267260
-------------------            ------------------             -----------------
(State or other                   (Commission                   (IRS Employer
 jurisdiction of                  File Number)                Identification
 incorporation)                                                       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
                                 --------------


         (Former name or former address, if changed since last report.)

Check  the  appropriate  box  below  if the  Form  8-K  filing  is  intended  to
simultaneously  satisfy the filing obligation of the registrant under any of the
following provisions (see General Instruction A.2):

[    ]     Written communications pursuant to Rule 425 under the Securities Act
           (17 CFR 230.425)

[    ]     Soliciting  material  pursuant to Rule 14a-12 under the Exchange Act
           (17 CFR 240.14a-12)

[    ]     Pre-commencement  communications pursuant to Rule 14d-2(b) under the
           Exchange Act (17 CFR 240.14d-2(b))

[    ]     Pre-commencement  communications pursuant to Rule 13e-4(c) under the
           Exchange Act (17 CFR 240.13e-4(c))



Item 2.02  Results of Operations and Financial Condition.

Item 7.01  Regulation FD Disclosure.

     Pursuant  to Items 2.02 and 7.01 of this  current  report,  the  registrant
hereby  furnishes the information set forth in its press release issued on March
16,  2006, a copy of which is attached  hereto as Exhibit 99.1 and  incorporated
herein by reference.

     The information,  including the exhibit,  the registrant  furnishes in this
report is not deemed  "filed"  for  purposes  of  section  18 of the  Securities
Exchange Act of 1934, as amended,  or otherwise  subject to the  liabilities  of
that  section.  Registration  statements  or  other  documents  filed  with  the
Securities and Exchange  Commission  shall not incorporate  this  information by
reference, except as otherwise expressly stated in such filing.

Item 9.01  Financial Statements and Exhibits.

     (c)  Exhibits.

          Item No.        Exhibit Index
          ----------      ----------------------------------------
          99.1            Press Release dated May 5, 2006 issued by the
                          registrant.



                                    SIGNATURE


     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.

                                         NL INDUSTRIES, INC.
                                             (Registrant)




                                             By:    /s/ Gregory M. Swalwell
                                                    ----------------------------
                                                    Gregory M. Swalwell
                                                    Vice President




Date:  May 8, 2006





                                INDEX TO EXHIBITS


Exhibit No.    Description
-----------    --------------------------------------------------

99.1           Press Release dated May 5, 2006 issued by the registrant.