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  Original  Restatement
discussed  in Note 1 to the  consolidated  financial  statements  and the matter
related to the Original  Restatement  discussed in the penultimate  paragraph of
Management's  Report on Internal  Control Over  Financial  Reporting as to which
date is May 31, 2005, and except for the Current Restatement discussed in Note 1
to the consolidated  financial  statements and the matter related to the Current
Restatement  discussed in the penultimate  paragraph of  Management's  Report on
Internal Control Over Financial Reporting as to which date is December 23, 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
December 23, 2005