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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">UNITED STATES</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">SECURITIES AND EXCHANGE COMMISSION</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">Washington, D.C.&#160;&#160; 20549</div>

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<div style="FONT-SIZE: 14pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">FORM 8-K</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">CURRENT REPORT</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">Date of Report (Date of the earliest event reported)</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">March 12, 2018</div>

<div style="FONT-SIZE: 18pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center; MARGIN-TOP: 18pt">Kronos Worldwide, Inc.</div>

<div style="MARGIN-BOTTOM: 18pt; FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">(Exact name of registrant as specified in its charter)</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">Delaware</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">1-31763</div>
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<td style="WIDTH: 33.33%; VERTICAL-ALIGN: top" colspan="2">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">76-0294959</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">(State or other jurisdiction of incorporation)</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">(Commission</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">File Number)</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">(IRS Employer</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">Identification No.)</div>
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<td style="WIDTH: 33.35%; VERTICAL-ALIGN: top">&#160;</td>
<td style="WIDTH: 33.33%; VERTICAL-ALIGN: top">&#160;</td>
<td style="WIDTH: 33.33%; VERTICAL-ALIGN: top" colspan="2">&#160;</td>
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<td style="WIDTH: 33.35%; VERTICAL-ALIGN: top">&#160;</td>
<td style="WIDTH: 33.33%; VERTICAL-ALIGN: top">&#160;</td>
<td style="WIDTH: 33.33%; VERTICAL-ALIGN: top" colspan="2">&#160;</td>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">5430 LBJ Freeway, Suite 1700, Dallas, Texas</div>
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<td style="WIDTH: 33.09%; VERTICAL-ALIGN: top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">75240-2620</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">(Address of principal executive offices)</div>
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<td style="WIDTH: 33.09%; VERTICAL-ALIGN: top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">(Zip Code)</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center; MARGIN-TOP: 12pt">Registrant's telephone number, including area code</div>

<div style="MARGIN-BOTTOM: 12pt; FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">(972) 233-1700</div>

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<td style="WIDTH: 24.01%; VERTICAL-ALIGN: top">&#160;</td>
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<td style="WIDTH: 24.03%; VERTICAL-ALIGN: top">&#160;</td>
<td style="WIDTH: 51.96%; VERTICAL-ALIGN: top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">(Former name or former address, if changed since last report.)</div>
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<td style="WIDTH: 24.01%; VERTICAL-ALIGN: top">&#160;</td>
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<div style="MARGIN-BOTTOM: 12pt; FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify; MARGIN-TOP: 24pt">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):</div>

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<div style="FONT-SIZE: 14pt; FONT-FAMILY: Wingdings; TEXT-ALIGN: center">&#61551;</div>
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<td style="WIDTH: 92.28%; VERTICAL-ALIGN: middle">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</div>
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<td style="WIDTH: 92.28%; VERTICAL-ALIGN: middle">&#160;</td>
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<div style="FONT-SIZE: 14pt; FONT-FAMILY: Wingdings; TEXT-ALIGN: center">&#61608;</div>
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<td style="WIDTH: 92.28%; VERTICAL-ALIGN: middle">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</div>
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<td style="WIDTH: 92.28%; VERTICAL-ALIGN: middle">&#160;</td>
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<td style="WIDTH: 7.72%; VERTICAL-ALIGN: top">
<div style="FONT-SIZE: 14pt; FONT-FAMILY: Wingdings; TEXT-ALIGN: center">&#61608;</div>
</td>
<td style="WIDTH: 92.28%; VERTICAL-ALIGN: middle">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</div>
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<td style="WIDTH: 7.72%; VERTICAL-ALIGN: top">&#160;</td>
<td style="WIDTH: 92.28%; VERTICAL-ALIGN: middle">&#160;</td>
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<td style="WIDTH: 7.72%; VERTICAL-ALIGN: top">
<div style="FONT-SIZE: 14pt; FONT-FAMILY: Wingdings; TEXT-ALIGN: center">&#61608;</div>
</td>
<td style="WIDTH: 92.28%; VERTICAL-ALIGN: middle">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify; BACKGROUND-COLOR: #ffffff">Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17&#160;CFR &#167;230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR &#167;240.12b-2).</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: right; MARGIN-TOP: 12pt">Emerging growth company&#160;&#160;<font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif">&#9744;</font></div>
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<div style="BACKGROUND-COLOR: #ffffff">
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify; MARGIN-TOP: 12pt">If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section&#160;13(a) of the Exchange Act.&#160;&#160;<font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif">&#9744;</font></div>
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<td style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; WIDTH: 108pt; VERTICAL-ALIGN: top; FONT-WEIGHT: bold; align: right">Item 2.02</td>
<td style="WIDTH: auto; VERTICAL-ALIGN: top; TEXT-ALIGN: justify">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold">Results of Operations and Financial Condition.</div>
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<div style="TEXT-ALIGN: justify">
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<td style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; WIDTH: 108pt; VERTICAL-ALIGN: top; FONT-WEIGHT: bold; align: right">Item 7.01</td>
<td style="WIDTH: auto; VERTICAL-ALIGN: top; TEXT-ALIGN: justify">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold">Regulation FD Disclosure.</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify; TEXT-INDENT: 36pt">The registrant hereby furnishes the information set forth in the press release issued on March 12, 2018, a copy of which is attached hereto as Exhibit 99.1 and incorporated herein by reference.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify; TEXT-INDENT: 36pt">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.&#160; Registration statements or other documents filed with the U.S. Securities and Exchange Commission shall not incorporate this information by reference, except as otherwise expressly stated in such filing.</div>

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<div style="TEXT-ALIGN: justify">
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<td style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; WIDTH: 108pt; VERTICAL-ALIGN: top; FONT-WEIGHT: bold; align: right">Item 9.01</td>
<td style="WIDTH: auto; VERTICAL-ALIGN: top; TEXT-ALIGN: justify">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold">Financial Statements and Exhibits.</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">(d)</div>
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<td style="WIDTH: 20.15%; VERTICAL-ALIGN: top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">Exhibits</div>
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<td style="WIDTH: 4.65%; VERTICAL-ALIGN: top">&#160;</td>
<td style="WIDTH: 67.77%; VERTICAL-ALIGN: top">&#160;</td>
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<td style="WIDTH: 20.15%; VERTICAL-ALIGN: top">&#160;</td>
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<td style="WIDTH: 67.77%; VERTICAL-ALIGN: top">&#160;</td>
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<tr>
<td style="WIDTH: 7.43%; VERTICAL-ALIGN: top">&#160;</td>
<td style="WIDTH: 20.15%; VERTICAL-ALIGN: top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">Item No.</div>
</td>
<td style="WIDTH: 4.65%; VERTICAL-ALIGN: top">&#160;</td>
<td style="WIDTH: 67.77%; VERTICAL-ALIGN: top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">Exhibit Index</div>
</td>
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<tr>
<td style="WIDTH: 7.43%; VERTICAL-ALIGN: top">&#160;</td>
<td style="WIDTH: 20.15%; VERTICAL-ALIGN: top">&#160;</td>
<td style="WIDTH: 4.65%; VERTICAL-ALIGN: top">&#160;</td>
<td style="WIDTH: 67.77%; VERTICAL-ALIGN: top">&#160;</td>
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<td style="WIDTH: 7.43%; VERTICAL-ALIGN: top">&#160;</td>
<td style="WIDTH: 20.15%; VERTICAL-ALIGN: top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">99.1</div>
</td>
<td style="WIDTH: 4.65%; VERTICAL-ALIGN: top">&#160;</td>
<td style="WIDTH: 67.77%; VERTICAL-ALIGN: top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify"><a href="ex991.htm">Press release dated March 12, 2018 issued by the registrant.</a></div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">SIGNATURE</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify; TEXT-INDENT: 36pt">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.</div>

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<td style="WIDTH: 51.7%; VERTICAL-ALIGN: top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: justify">KRONOS WORLDWIDE, INC.</div>
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<td style="WIDTH: 51.7%; VERTICAL-ALIGN: top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">(Registrant)</div>
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<td style="WIDTH: 51.7%; VERTICAL-ALIGN: top">&#160;</td>
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<td style="WIDTH: 51.7%; VERTICAL-ALIGN: top">&#160;</td>
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<td style="WIDTH: 51.7%; VERTICAL-ALIGN: top">&#160;</td>
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<td style="WIDTH: 51.7%; VERTICAL-ALIGN: top; BORDER-BOTTOM: #000000 2px solid">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">By:&#160;&#160;&#160;&#160;&#160;&#160;/s/ Gregory M. Swalwell</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">Date:&#160; March 12, 2018</div>
</td>
<td style="WIDTH: 51.7%; VERTICAL-ALIGN: top">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-STYLE: italic; TEXT-ALIGN: justify">Gregory M. Swalwell, Executive Vice President </div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-STYLE: italic; TEXT-ALIGN: justify">and Chief Financial Officer</div>
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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 12, 2018
Kronos Worldwide, Inc.
(Exact name of registrant as specified in its charter)
Delaware
1-31763
76-0294959
(State or other jurisdiction of incorporation)
(Commission
File Number)
(IRS Employer
Identification No.)
5430 LBJ Freeway, Suite 1700, Dallas, Texas
75240-2620
(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))
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).
Emerging growth company
☐
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.
☐
Item 2.02
Results of Operations and Financial Condition.
Item 7.01
Regulation FD Disclosure.
The registrant hereby furnishes the information set forth in the press release issued on March 12, 2018, 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 U.S. 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.
(d)
Exhibits
Item No.
Exhibit Index
99.1
Press release dated March 12, 2018 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
Date:  March 12, 2018
Gregory M. Swalwell, Executive Vice President
and Chief Financial Officer