EXHIBIT 23.1


            CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


We  hereby  consent  to the  incorporation  by  reference  in  the  Registration
Statements on Form S-8 (Nos. 33-29287,  33-25913,  333-65817 and 33-48145) of NL
Industries,   Inc.  of  our  report  dated  March  16,  2006,  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 which appears in
this Form 10-K.




PricewaterhouseCoopers LLP



Dallas, Texas
March 16, 2006