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<font size="3"><B><p align="center">UNITED STATES</br>
SECURITIES AND EXCHANGE COMMISSION</br>
Washington, DC 20549</font></p></B>

<BR>
<HR WIDTH="25%">
<p align="center"><font size="3"><B>FORM 8-K</B></font></p>
<HR WIDTH="25%">
<BR>

<font size="3"><B><p align="center">
CURRENT REPORT
</font></p></B>

<font size="3"><B><p align="center">
Pursuant to Section 13 or 15(d) of the Securities
     Exchange Act of 1934
</font></p></B>
<font size="3"><B><p align="center">
<U>   April 27, 2005</U>
</font></p></B>

<font size="2"><p align="center">
             Date of Report (Date of earliest event reported)
</font></p>

<font size="5" color="#0000FF"><B><p align="center">
                 <u> SIEBEL SYSTEMS, INC.</u>
</B></font></br>
<font size="2">
             (Exact Name of Registrant as Specified in Charter)
</font></p>

<P>&nbsp;
<TABLE COLS=3 WIDTH="100%" >
<TR>
<TD>
<font size="3"><B>
<CENTER><u>Delaware</u></CENTER>
</font></B>
</TD>
<TD>
<font size="3"><B>
<CENTER><u>0-20725</u></CENTER>
</font></B>
</TD>
<TD>
<font size="3"><B>
<CENTER><u>94-3187233</u></CENTER>
</font></B>
</TD>
</TR>
<TR>
<TD>
<font size="2">
<CENTER>(State or Other Jurisdiction</CENTER>
<CENTER>of Incorporation)</CENTER>
</font>
</TD>
<TD>
<font size="2">
<CENTER>(Commission</CENTER>
<CENTER>File Number)</CENTER>
</font>
</TD>
<TD>
<font size="2">
<CENTER>(IRS Employer </CENTER>
<CENTER>Identification No.)</CENTER>
</font>
</TD>
</TR>
</TABLE>
<BR>


<font size="3"><B><p align="center">
                            2207 Bridgepointe Parkway<BR>
                            <u>San Mateo, CA &nbsp; 94404
</U></font></B><BR>

<font size="2">
                   (Address of Principal Executive Offices, Including Zip Code)
</font></p>

<font size="3"><B><U><p align="center">
                                 (650) 477-5000
</U></font></B><BR>

<font size="2">
             (Registrant's Telephone Number, Including Area Code)
</font></p>

<P ALIGN="CENTER">&nbsp;</P>
<FONT SIZE=2><P>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):</P>
<P>[ ] Written communications pursuant to Rule 425 under the Securities Act (17
CFR 230.425)</P>
<P>[ ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17
CFR 240.14a-12)</P>
<P>[ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the
Exchange Act (17 CFR 240.14d-2(b))</P>
<P>[ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the
Exchange Act (17 CFR 240.13e-4(c))</P>
<P ALIGN="JUSTIFY"></P>
<P ALIGN="JUSTIFY">&nbsp;</P>
<BR>
<BR>
<HR WIDTH="85%">
<BR>
<BR>

</FONT>

<B><P>Item 2.02.  Results of Operations and Financial Condition.</P>
</B><P>On April 27, 2005, Siebel Systems, Inc.
issued a press release announcing its financial results for the quarter
ended March 31, 2005.  A copy of the press release, dated as of April 27,
2005, is furnished as <B>Exhibit 99.1</B> to this Current Report and is
incorporated in this Item 2.02 by reference.  The press release is furnished and
shall not be deemed &quot;filed&quot; for purposes of Section 18 of the
Securities Exchange Act of 1934 (the &quot;Exchange Act&quot;), or subject to
the liabilities of that Section or Sections 11 and 12(a)(2) of the Securities
Act of 1933, as amended.</P>

<B>
<P>Item 9.01.   Financial Statements and Exhibits.</P>
</B><P>(c) Exhibits. The following exhibits are furnished herewith:
</P>

<TABLE BORDER=0 ALIGN="left" CELLSPACING=1 CELLPADDING=7 WIDTH=625>
<TR><TD WIDTH="15%" VALIGN="BOTTOM">
<P><B><FONT SIZE=2>
<U>Number</U>
</B></TD>
<TD WIDTH="85%" VALIGN="BOTTOM">
<FONT SIZE=2><P ALIGN="CENTER"><B>
<u>Description</u>
</B></TD>
</TR>

<TR><TD WIDTH="15%" VALIGN="TOP">
<P><FONT SIZE=2>
<A HREF="exh99-1.htm">                            99.1</A>
</TD>
<TD WIDTH="100%" VALIGN="TOP">
<FONT SIZE=2><P>
Press release entitled "Siebel Systems Reports Financial Results for the Quarter Ended March 31, 2005" dated April 27, 2005.
</TD>
</TR>
</TABLE>

<BR>
<P>&nbsp;</P>
<P>&nbsp;</P>
<P>&nbsp;</P>
<P>&nbsp;</P>
<BR>
<HR width="85%">
<BR>
<BR>
<BR>
<B><P ALIGN="CENTER">SIGNATURE</P>
</B><P ALIGN="JUSTIFY"><Font size="2">Pursuant to the requirements of the Securities Exchange Act of 1934, as amended,
the Registrant has duly caused this report to be signed on its behalf by the undersigned,
hereunto duly authorized.</P>

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  <TR vAlign=top>
    <TD>&nbsp;</TD>
    <TD align=left><FONT SIZE=2>
<B>                                   SIEBEL SYSTEMS, INC.</B>
</TD></TR></TABLE>

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    <TD>&nbsp;</TD>
    <TD align=left><FONT SIZE=2>
<I>(Registrant)</I>
</TD></TR></TABLE>


<FONT SIZE=2>
<p>Dated: April 27, 2005


<P>
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  <TR vAlign=top>
    <TD>&nbsp;</TD>
    <TD><FONT SIZE=2>By:&nbsp;</TD>
   <TD align=left><FONT SIZE=2>
/s/ Kenneth A. Goldman
</TD></TR></TABLE>


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  <TR>
    <TD width="38%"></TD>
    <TD width="62%"></TD></TR>
  <TR vAlign=top>
    <TD>&nbsp;</TD>
    <TD align=left>
      <HR align=left SIZE=1>
    </TD></TR>
  <TR vAlign=top>
    <TD>&nbsp;</TD>
    <TD align=left><FONT SIZE=2>
Kenneth A. Goldman
</TD></TR>
  <TR vAlign=top>
    <TD>&nbsp;</TD>
    <TD align=left><FONT SIZE=2><I>
                                    Senior Vice President,<BR>
                                    Finance and Administration<BR>
                                    and Chief Financial Officer
</I></TD></TR></TABLE></P>

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Form 8K doc
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d) of the Securities
     Exchange Act of 1934
April 27, 2005
Date of Report (Date of earliest event reported)
SIEBEL SYSTEMS, INC.
(Exact Name of Registrant as Specified in Charter)
Delaware
0-20725
94-3187233
(State or Other Jurisdiction
of Incorporation)
(Commission
File Number)
(IRS Employer
Identification No.)
2207 Bridgepointe Parkway
San Mateo, CA   94404
(Address of Principal Executive Offices, Including Zip Code)
(650) 477-5000
(Registrant's Telephone Number, Including Area Code)
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):
[ ] 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.
On April 27, 2005, Siebel Systems, Inc.
issued a press release announcing its financial results for the quarter
ended March 31, 2005.  A copy of the press release, dated as of April 27,
2005, is furnished as
Exhibit 99.1
to this Current Report and is
incorporated in this Item 2.02 by reference.  The press release is furnished and
shall not be deemed "filed" for purposes of Section 18 of the
Securities Exchange Act of 1934 (the "Exchange Act"), or subject to
the liabilities of that Section or Sections 11 and 12(a)(2) of the Securities
Act of 1933, as amended.
Item 9.01.   Financial Statements and Exhibits.
(c) Exhibits. The following exhibits are furnished herewith:
Number
Description
99.1
Press release entitled "Siebel Systems Reports Financial Results for the Quarter Ended March 31, 2005" dated April 27, 2005.
SIGNATURE
Pursuant to the requirements of the Securities Exchange Act of 1934, as amended,
the Registrant has duly caused this report to be signed on its behalf by the undersigned,
hereunto duly authorized.
SIEBEL SYSTEMS, INC.
(Registrant)
Dated: April 27, 2005
By:
/s/ Kenneth A. Goldman
Kenneth A. Goldman
Senior Vice President,
Finance and Administration
and Chief Financial Officer