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)
                                   May 8, 2006
                                ----------------

                             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 2.02  Results of Operations and Financial Condition.

Item 7.01  Regulation FD Disclosure.

     Pursuant  to Items 2.02 and 7.01 of this  current  report,  the  registrant
hereby  furnishes the information set forth in its press release issued on March
16,  2006, 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 May 5, 2006 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/ Gregory M. Swalwell
                                                    ----------------------------
                                                    Gregory M. Swalwell
                                                    Vice President




Date:  May 8, 2006





                                INDEX TO EXHIBITS


Exhibit No.    Description
- -----------    --------------------------------------------------

99.1           Press Release dated May 5, 2006 issued by the registrant.



Kronos Worldwide, Inc.                          Contact: Gregory M. Swalwell
Three Lincoln Centre                                     Vice President, Finance
5430 LBJ Freeway, Suite 1700                             (972) 233-1700
Dallas, TX  75240-2697
- -----------------------------                   --------------------------------
News Release
- --------------------------------------------------------------------------------

FOR IMMEDIATE RELEASE
                                                               [GRAPHIC OMITTED]

                 KRONOS WORLDWIDE REPORTS FIRST QUARTER RESULTS


DALLAS,  TEXAS...May 5, 2006...Kronos Worldwide,  Inc. (NYSE:KRO) today reported
net income for the first quarter of 2006 of $15.0  million,  or $.31 per diluted
share,  compared with net income of $21.4 million, or $.44 per diluted share, in
the first quarter of 2005.

Net sales of $304.3 million in the first quarter of 2006 were $12.4 million,  or
4%,  higher  than the first  quarter  of 2005 due to the net  effects  of higher
average TiO2 selling prices, higher sales volumes, and the unfavorable effect of
fluctuations  in foreign  currency  exchange  rates,  which  decreased  sales by
approximately $16 million.

The  Company's  TiO2 segment  profit (see  description  of non-GAAP  information
below)  for the first  quarter  of 2006 was $36.2  million  compared  with $48.0
million in the first quarter of 2005.  First quarter  segment profit  diminished
due primarily to higher production  costs,  particularly raw material and energy
costs, as well as the negative  effects of the  fluctuation in foreign  currency
rates  which  resulted  in a net  decrease in the  Company's  segment  profit of
approximately $5 million.

The Company's  average selling prices in billing  currencies (which excludes the
effects  of  fluctuations  in the  value of the U.S.  dollar  relative  to other
currencies) were 2% higher in the first quarter of 2006 as compared to the first
quarter  of 2005.  Expressed  in U.S.  dollars  computed  using  actual  foreign
currency exchange rates prevailing during the respective periods,  the Company's
average selling prices in the first quarter of 2006 were 3% lower than the first
quarter of 2005.

The Company's first quarter 2006 TiO2 sales volumes  increased 9% from the first
quarter of 2005,  primarily  due to higher sales volumes in the US, and slightly
higher sales volumes in Europe and in export  markets  offsetting the effects of
lower sales volumes in Canada.  The Company's  TiO2  production  volumes were 4%
higher in the first  quarter of 2006 as compared  to the first  quarter of 2005,
with  operating  rates at near full  capacity in both  periods.  Finished  goods
inventories at March 31, 2006,  representing  approximately  2 months of average
sales,  were  slightly  higher as  compared to December  31, 2005  levels.  Both
production volume and sales volume in the first quarter of 2006 were new records
for Kronos for a first quarter.

Interest expense  decreased due to relative changes in foreign currency exchange
rates,  which  decreased the U.S. dollar  equivalent of interest  expense on the
Company's  Senior Secured Notes by approximately $1 million in the first quarter
of 2006 as compared to 2005.

The statements in this release relating to matters that are not historical facts
are  forward-looking   statements  that  represent   management's   beliefs  and
assumptions  based on  currently  available  information.  Although  the Company
believes that the expectations reflected in such forward-looking  statements are
reasonable,  it cannot give any assurances that these expectations will prove to
be correct.  Such  statements  by their  nature  involve  substantial  risks and
uncertainties  that could  significantly  impact  expected  results,  and actual
future   results  could  differ   materially   from  those   described  in  such
forward-looking  statements.  While it is not  possible to identify all factors,
the Company  continues  to face many risks and  uncertainties.  The factors that
could cause actual  future  results to differ  materially  include,  but are not
limited to, the following:
o    Future supply and demand for the Company's products,
o    The extent of the  dependence  of certain of the  Company's  businesses  on
     certain market sectors,
o    The cyclicality of the Company's businesses,
o    Customer  inventory  levels  (such as the  extent  to which  the  Company's
     customers may, from time to time,  accelerate  purchases of TiO2 in advance
     of  anticipated  price  increases or defer  purchases of TiO2 in advance of
     anticipated price decreases),
o    Changes in raw material and other operating costs (such as energy costs),
o    The possibility of labor disruptions,
o    General global  economic and political  conditions  (such as changes in the
     level of gross  domestic  product in  various  regions of the world and the
     impact of such changes on demand for TiO2),
o    Competitive products and substitute products,
o    Customer and competitor strategies,
o    The impact of pricing and production decisions,
o    Competitive technology positions,
o    The introduction of trade barriers,
o    Fluctuations  in currency  exchange  rates (such as changes in the exchange
     rate between the U.S. dollar and each of the euro, the Norwegian kroner and
     the Canadian dollar),
o    Operating  interruptions  (including,  but not limited to, labor  disputes,
     leaks,  natural  disasters,  fires,  explosions,  unscheduled  or unplanned
     downtime and transportation interruptions),
o    The timing and amounts of insurance recoveries,
o    The ability of the Company to renew or refinance credit facilities,
o    The ultimate  outcome of income tax audits,  tax settlement  initiatives or
     other tax matters,
o    The ultimate ability to utilize income tax attributes, the benefit of which
     has been recognized under the "more-likely-than-not" recognition criteria,
o    Environmental  matters  (such as those  requiring  emission  and  discharge
     standards for existing and new facilities),
o    Government laws and regulations and possible changes therein,
o    The  ultimate  resolution  of pending  litigation,  and o  Possible  future
     litigation.

Should one or more of these risks  materialize  (or the  consequences  of such a
development  worsen),  or should the  underlying  assumptions  prove  incorrect,
actual results could differ  materially from those  forecasted or expected.  The
Company   disclaims  any  intention  or  obligation  to  update  or  revise  any
forward-looking statement whether as a result of changes in information,  future
events or otherwise.

In an effort to provide  investors  with  additional  information  regarding the
Company's results of operations as determined by accounting principles generally
accepted in the United  States of America  ("GAAP"),  the Company has  disclosed
certain  non-GAAP  information,  which  the  Company  believes  provides  useful
information to investors:

o    The Company discloses percentage changes in its average TiO2 selling prices
     in billing  currencies,  which  excludes  the  effects of foreign  currency
     translation.  The Company  believes  disclosure of such percentage  changes
     allows  investors to analyze such changes  without the impact of changes in
     foreign  currency  exchange rates,  thereby  facilitating  period-to-period
     comparisons  of  relative  changes in average  TiO2  selling  prices in the
     actual various billing currencies.  Generally,  when the U.S. dollar either
     strengthens or weakens against other  currencies,  the percentage change in
     average TiO2 selling prices in billing  currencies will be higher or lower,
     respectively,  than such percentage  changes would be using actual exchange
     rates prevailing during the respective periods.

o    The  Company  discloses  segment  profit,  which  is used by the  Company's
     management to assess the performance of the Company's TiO2 operations.  The
     Company believes  disclosure of segment profit provides useful  information
     to investors  because it allows investors to analyze the performance of the
     Company's  TiO2  operations in the same way that the  Company's  management
     assesses  performance.  The Company defines segment profit as income before
     income  taxes,  interest  expense  and  certain  general  corporate  items.
     Corporate items excluded from the  determination  of segment profit include
     corporate  expense and interest  income not  attributable  to the Company's
     TiO2 operations.

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




                             KRONOS WORLDWIDE, INC.
                   CONDENSED CONSOLIDATED STATEMENTS OF INCOME
               (In millions, except per share and metric ton data)
                                   (Unaudited)



                                                                    Three months ended
                                                                         March 31,
                                                                   --------------------

                                                                    2005         2006
                                                                    ----         ----

                                                                       
Net sales                                                       $   291.9    $   304.3
Cost of sales                                                       207.7        229.5
                                                                ---------    ---------

    Gross margin                                                     84.2         74.8

Selling, general and administrative expense                          37.2         37.8
Other operating income (expense):
  Currency transactions, net                                           .9          (.8)
  Other expense                                                       -            (.5)

  Corporate expense                                                  (1.4)        (1.3)
                                                                ---------    ---------

    Income from operations                                           46.5         34.4

Other income (expense):
  Trade interest income                                                .1           .5
  Other interest income                                                .3          -
  Interest expense                                                  (11.8)       (10.7)
                                                                ---------    ---------

    Income before income taxes                                       35.1         24.2

Provision for income taxes                                           13.7          9.2
                                                                ---------    ---------

    Net income                                                  $    21.4    $    15.0
                                                                =========    =========

Basic and diluted net income per share                          $     .44    $     .31

Basic and diluted weighted-average
shares used in the calculation of net income per share               48.9         48.9

TiO2 data - metric tons in thousands:
  Sales volumes                                                     114          124
  Production volumes                                                122          127










                             KRONOS WORLDWIDE, INC.

                       RECONCILIATION OF SEGMENT PROFIT TO
                             INCOME FROM OPERATIONS
                                  (In millions)
                                   (Unaudited)



                                                                    Three months ended
                                                                         March 31,
                                                                   --------------------

                                                                    2005         2006
                                                                    ----         ----

                                                                       
Segment profit                                                  $    48.0    $    36.2

Adjustments:
   Trade interest income                                              (.1)         (.5)
   Corporate expense                                                 (1.4)        (1.3)
                                                                ---------    ---------

Income from operations                                          $    46.5    $    34.4
                                                                =========    =========




                     RECONCILIATION OF PERCENTAGE CHANGE IN
                             AVERAGE SELLING PRICES
                                   (Unaudited)



                                                                  Three months ended
                                                                       March 31,
                                                                     2006 vs. 2005
                                                                  ------------------

Percentage change in average selling prices:
                                                                       
    Using actual foreign currency exchange rates                         -3%
    Impact of changes in foreign currency exchange rates                 +5%
                                                                         ---
    In billing currencies                                                +2%
                                                                         ===