UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.   20549

FORM SD

Specialized Disclosure Report

(Exact name of registrant as specified in its charter)

Gregory M. Swalwell

Executive Vice President and

Chief Financial Officer

NL Industries, Inc.

Three Lincoln Centre

5430 LBJ Freeway, Suite 1700

Dallas, Texas  75240-2697

(972) 233-1700

(Name and telephone number, including area code, of the person to contact in connection with this report.)

Check the appropriate box to indicate the rule pursuant to which this form is being filed, and provide the period to which the information in this form applies:

Section 1 - Conflict Minerals Disclosure

Item 1.01 Conflict Minerals Disclosure and Report

The registrant incorporates herein by reference the Conflict Minerals Disclosure for the 2017 calendar year contained in the Form SD filed on May 24, 2018 by the registrant's subsidiary, CompX International Inc. (Securities and Exchange Act file no. 1-13905), with the U.S. Securities and Exchange Commission.  Such Conflict Minerals Disclosure is posted on the subsidiary's website at:

http://compxinternational.gcs-web.com/conflict-minerals-disclosure

This Conflicts Minerals Disclosure is also posted on the registrant's website at:

http://www.nl-ind.com/home.nsf

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.