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        D.C. 20549</strong></font></div>
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        2005</strong></font></div>
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        provisions (see General Instruction A.2. below):</font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
        5.02</strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Departure
        of Directors or Principal Officers; Election of Directors; Appointment of
        Principal Officers.</strong></font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(b)
        It
        was previously reported that Mr. John W. Johnstone, Jr. intended to retire
        as a
        director. Mr. Johnstone, who is age 72, has resigned as a director of Arch
        Chemicals, Inc. (the &#8220;Company&#8221;) effective October 11, 2005.</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Mr.
        Richard Cavanagh, an existing director, has replaced Mr. Johnstone as Chair
        of
        the Board&#8217;s Corporate Governance Committee.</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
        5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal
        Year.</strong></font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">In
        connection with the retirement of Mr. Johnstone as a Director on October
        11,
        2005, the Board of Directors of the Company amended the second sentence of
        Section 1 of Article II of the Company&#8217;s Bylaws to reduce the number of
        directors from eight to seven. A copy of the Bylaws as so amended are attached
        hereto as Exhibit 3 to this report.</font></div>
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                <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong><u>Description</u></strong></font></div>
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              <td align="left" style="WIDTH: 72pt"><font size="2">&#160;&#160;&#160;&#160;&#160;&#160;&#160;
                3</font></td>
              <td align="left"><font size="2">Bylaws of the Company effective October
                11,
                2005.</font></td>
            </tr>

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        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.3; MARGIN-RIGHT: 0pt" align="left">&#160;<br></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">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.</font></div>
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              <td width="1%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;</font></td>
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              <td colspan="2"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>ARCH
                CHEMICALS, INC.</strong></font></td>
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              <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;<br>&#160;</font></td>
              <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;<br>&#160;</font></td>
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              <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Date:&#160;October
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              <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">By:&#160;&#160;</font></td>
              <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">/s/&#160;Louis
                S. Massimo</font></td>
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                  Louis S. Massimo</font></div>
                <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Title:&#160;&#160;&#160;&#160;&#160;&#160;
                  Executive Vice President and Chief Financial
                  Officer</font></div>
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                <td align="left" style="WIDTH: 72pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong><u>Exhibit
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                <td>
                  <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong><u>Description</u></strong></font></div>
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                <td align="left" style="WIDTH: 72pt"><font size="2">&#160;&#160;&#160;&#160;&#160;&#160;&#160;
                  3</font></td>
                <td align="left"><font size="2">Bylaws of the Company effective
                  October 11,
                  2005.</font></td>
              </tr>

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{"company-data": {"conformed-name": "ARCH CHEMICALS INC", "cik": "0001072343", "assigned-sic": "2800", "irs-number": "061526315", "state-of-incorporation": "VA", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-14601", "film-number": "051136044"}, "business-address": {"street1": "501 MERRITT 7", "street2": "P O BOX 4500", "city": "NORWALK", "state": "CT", "zip": "06856-4500", "phone": "2037503729"}, "mail-address": {"street1": "501 MERRITT 7", "street2": "P O BOX 4500", "city": "NORWALK", "state": "CT", "zip": "06856-4500"}}
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 earliest event reported): October 11,
        2005
ARCH
        CHEMICALS, INC.
(Exact
        name of registrant as specified in its charter)
Virginia
1-14601
06-1526315
(State
                  or other jurisdiction
of
                  incorporation)
(Commission
                  File Number)
(IRS
                  Employer
Identification
                  No.)
501
                  Merritt 7, Norwalk, CT
06851
(Address
                  of principal executive offices)
(Zip
                  code)
Registrant's
        telephone number, including area code: (203) 229-2900
(N/A)
(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. below):
o
Written
                  communications pursuant to Rule 425 under the Securities Act (17
                  CFR
                  230.425)
o
Soliciting
                  material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
                  240.14a-12)
o
Pre-commencement
                  communications pursuant to Rule 14d-2(b) under the Exchange Act
                  (17 CFR
                  240.14d-2(b))
o
Pre-commencement
                  communications pursuant to Rule 13e-4(c) under the Exchange Act
                  (17 CFR
                  240.13e-4(c))
Item
        5.02
Departure
        of Directors or Principal Officers; Election of Directors; Appointment of
        Principal Officers.
(b)
        It
        was previously reported that Mr. John W. Johnstone, Jr. intended to retire
        as a
        director. Mr. Johnstone, who is age 72, has resigned as a director of Arch
        Chemicals, Inc. (the "Company") effective October 11, 2005.
Mr.
        Richard Cavanagh, an existing director, has replaced Mr. Johnstone as Chair
        of
        the Board's Corporate Governance Committee.
Item
        5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal
        Year.
In
        connection with the retirement of Mr. Johnstone as a Director on October
        11,
        2005, the Board of Directors of the Company amended the second sentence of
        Section 1 of Article II of the Company's Bylaws to reduce the number of
        directors from eight to seven. A copy of the Bylaws as so amended are attached
        hereto as Exhibit 3 to this report.
Item
        9.01 Financial Statements and Exhibits.
Exhibit
                No.
Description
3
Bylaws of the Company effective October
                11,
                2005.
SIGNATURES
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.
ARCH
                CHEMICALS, INC.
Date: October
                12, 2005
By:
/s/ Louis
                S. Massimo
Name:    
                  Louis S. Massimo
Title:      
                  Executive Vice President and Chief Financial
                  Officer
Exhibit
                  No.
Description
3
Bylaws of the Company effective
                  October 11,
                  2005.