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)
                                  March 3, 2005
                                ----------------

                             Kronos Worldwide, Inc.
             ------------------------------------------------------
             (Exact name of Registrant as specified in its charter)

     Delaware                        1-31763                    76-0294959
- -------------------             ------------------           -----------------
  (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 7.01 Regulation FD Disclosure. The registrant hereby furnishes the information set forth in its press release issued on March 3, 2005, 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 March 3, 2005 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. KRONOS WORLDWIDE, INC. (Registrant) By: /s/ A. Andrew R. Louis ---------------------- A. Andrew R. Louis Assistant Secretary Date: March 7, 2005

INDEX TO EXHIBITS Exhibit No. Description - ----------- -------------------------------------------------- 99.1 Press Release dated March 3, 2005 issued by the registrant.

KRONOS WORLDWIDE, INC.                     Contact:  Gregory M. Swalwell
Three Lincoln Centre                                 Vice President,  Finance
5430 LBJ Freeway, Suite 1700                         and Chief Financial Officer
Dallas, Texas   75240-2697                           (972) 233-1700
- --------------------------------------------------------------------------------
PRESS RELEASE
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FOR IMMEDIATE RELEASE


 KRONOS WORLDWIDE, INC. ANNOUNCES EFFECTIVENESS OF SHELF REGISTRATION STATEMENT


         DALLAS,  TEXAS - March 3, 2005 - Kronos  Worldwide,  Inc.  (NYSE:  KRO)
today  announced  that its  shelf  registration  statement  on Form S-3 filed on
January  24,  2005,  has been  declared  effective  by the U.S.  Securities  and
Exchange Commission.  The registration statement permits the offer and sale from
time to time of up to $100,000,000 of common stock, preferred stock and warrants
of Kronos  Worldwide.  The terms of any offering will be established at the time
of the offering.

         Any offering of securities  covered by the registration  statement will
be made only by means of written prospectuses and prospectus  supplements.  This
press release shall not constitute an offer to sell, nor the  solicitation of an
offer to buy,  nor shall there be any sale of  securities  in any state in which
such offer,  solicitation  or sale would be unlawful  prior to  registration  or
qualification under the securities laws of any such state.

         Kronos Worldwide,  Inc. is a major  international  producer of titanium
dioxide pigments.

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