EXHIBIT 23.1





            CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


We hereby consent to the incorporation by reference in the:

     (i)  Registration Statement No. 33-29287 on Form S-8 and related Prospectus
          with respect to the 1989 Long Term  Performance  Incentive  Plan of NL
          Industries, Inc.; and

     (ii) Registration Statement No. 33-25913 on Form S-8 and related Prospectus
          with respect to the NL Industries, Inc. Retirement Savings Plan; and

     (iii)Registration   Statement  No.   333-65817  on  Form  S-8  and  related
          Prospectus  with respect to the NL  Industries,  Inc.  1998  Long-Term
          Incentive Plan; and

     (iv) Registration Statement No. 33-48145 on Form S-8 and related Prospectus
          with respect to the NL Industries,  Inc. 1992  Non-Employee  Directors
          Stock Option Plan.


of our reports  dated March 30, 2005,  except for the  restatement  described in
Note 1 to the consolidated  financial statements and the matter described in the
second and third  paragraphs  of  Management's  Report on Internal  Control Over
Financial  Reporting  as to which  the  date is May 31,  2005,  relating  to the
consolidated financial statements,  financial statement schedules,  management's
assessment of the effectiveness of internal control over financial reporting and
the effectiveness of internal control over financial reporting of NL Industries,
Inc., which appear in this Form 10-K/A.






                                       PricewaterhouseCoopers LLP




Dallas, Texas
May 31, 2005