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<TITLE>FORM S-8</TITLE>
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 <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="right"><FONT FACE="Times New Roman" SIZE="2">As filed with the Securities and Exchange Commission on August 22, 2005 </FONT></P>
 <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="right"><FONT FACE="Times New Roman" SIZE="2">Registration No. 333 -______ </FONT></P> <P STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P><HR SIZE="3" NOSHADE COLOR="#000000">
 <P STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="5"><B>UNITED STATES SECURITIES AND EXCHANGE COMMISSION
</B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"><B>Washington, D.C. 20549 </B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><HR WIDTH="17%"SIZE="1" NOSHADE COLOR="#000000"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center">
<FONT FACE="Times New Roman" SIZE="5"><B>FORM S-8 </B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="5"><B>REGISTRATION STATEMENT </B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="3"><I>Under
</I></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="3"><I>The Securities Act of 1933 </I></FONT></P> <P STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P><HR WIDTH="17%" SIZE="1" NOSHADE COLOR="#000000"> <P STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="6"><B>NATIONAL INSTRUMENTS
CORPORATION </B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="1"><B>(Exact name of registrant as specified in its charter) </B></FONT></P>
<P STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P><HR WIDTH="17%" SIZE="1" NOSHADE COLOR="#000000"> <P STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P>
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<TD VALIGN="top" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"><B>Delaware</B></FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"><B>74-1871327</B></FONT></TD></TR>
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<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="1"><B>(State or other jurisdiction of</B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px" ALIGN="center">
<FONT FACE="Times New Roman" SIZE="1"><B>incorporation or organization)</B></FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="1"><B>(I.R.S. Employer</B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px" ALIGN="center">
 <FONT FACE="Times New Roman" SIZE="1"><B>Identification Number)</B></FONT></P></TD></TR>
</TABLE> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"><B>11500 North MoPac
Expressway </B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"><B>Austin, Texas 78759 </B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center">
<FONT FACE="Times New Roman" SIZE="1"><B>(Address, including zip code, of registrant&#146;s principal executive offices) </B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P>
<HR WIDTH="17%" SIZE="1" NOSHADE COLOR="#000000"> <P STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"><B>2005 Incentive Plan

</B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="1"><B>(Full title of the Plan) </B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P><HR WIDTH="17%"SIZE="1" NOSHADE COLOR="#000000">
<P STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"><B>David G. Hugley</B></FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"><B>Vice President, General Counsel; Secretary </B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center">
<FONT FACE="Times New Roman" SIZE="2"><B>National Instruments Corporation </B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"><B>11500 North Mopac Expressway </B></FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"><B>Austin, Texas 78759 </B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"><B>(512) 338-9119
</B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="1"><B>(Name, address, and telephone number, including area code, of agent for service) </B></FONT></P>
<P STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P><HR WIDTH="17%" SIZE="1" NOSHADE COLOR="#000000"> <P STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"><I>Copy to: </I> </FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"><B>J. Robert Suffoletta, Jr. </B></FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"><B>Wilson Sonsini Goodrich &amp; Rosati </B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman"SIZE="2"><B>Professional Corporation </B></FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"><B>8911 Capital of Texas Highway, North </B></FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px"ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"><B>Westech 360, Suite 3350 </B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"><B>Austin, Texas 78759-7247 </B></FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"><B>CALCULATION OF REGISTRATION FEE </B></FONT></P>
<P STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P>
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<TD WIDTH="16%"></TD>
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<TD VALIGN="bottom" ALIGN="center" STYLE="BORDER-TOP:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-left:8px"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="1"><B>Title of securities
to</B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="1"><B>be registered</B></FONT></P></TD>
<TD VALIGN="bottom" STYLE="BORDER-LEFT:1px solid #000000; BORDER-TOP:1px solid #000000; BORDER-BOTTOM:1px solid #000000"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom" ALIGN="center" STYLE="BORDER-TOP:1px solid #000000; BORDER-RIGHT:1px solid #000000; BORDER-BOTTOM:1px solid #000000"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman"
SIZE="1"><B>Amount</B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="1"><B>to be registered (1)</B></FONT></P></TD>
<TD VALIGN="bottom" STYLE="BORDER-TOP:1px solid #000000; BORDER-BOTTOM:1px solid #000000"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom" ALIGN="center" STYLE="BORDER-TOP:1px solid #000000; BORDER-BOTTOM:1px solid #000000"><FONT FACE="Times New Roman" SIZE="1"><B>Proposed maximum offering price per share</B></FONT></TD>
<TD VALIGN="bottom" STYLE="BORDER-LEFT:1px solid #000000; BORDER-TOP:1px solid #000000; BORDER-BOTTOM:1px solid #000000"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom" ALIGN="center" STYLE="BORDER-TOP:1px solid #000000; BORDER-RIGHT:1px solid #000000; BORDER-BOTTOM:1px solid #000000"><FONT FACE="Times New Roman" SIZE="1"><B>Proposed maximum aggregate offering price</B></FONT></TD>
<TD VALIGN="bottom" STYLE="BORDER-TOP:1px solid #000000; BORDER-BOTTOM:1px solid #000000"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom" ALIGN="center" STYLE="BORDER-TOP:1px solid #000000; BORDER-BOTTOM:1px solid #000000"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="1"><B>Amount of registration</B></FONT></P> <P
STYLE="margin-top:0px;margin-bottom:1px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="1"><B>fee</B></FONT></P></TD></TR>
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<TD VALIGN="top" STYLE="BORDER-BOTTOM:1px solid #000000; padding-left:8px"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT FACE="Times New Roman" SIZE="2">
Common Stock, $0.01 par value per share, issuable<BR>upon restricted stock awards or restricted units<BR>under 2005 Incentive Plan</FONT></P></TD>
<TD VALIGN="bottom" STYLE="BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top" NOWRAP ALIGN="center" STYLE="BORDER-RIGHT:1px solid #000000; BORDER-BOTTOM:1px solid #000000"><FONT FACE="Times New Roman" SIZE="2">2,700,000&nbsp;shares</FONT></TD>
<TD VALIGN="bottom" STYLE="BORDER-BOTTOM:1px solid #000000"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top" NOWRAP ALIGN="center" STYLE="BORDER-BOTTOM:1px solid #000000"><FONT FACE="Times New Roman" SIZE="2">$27.25(2)</FONT></TD>
<TD VALIGN="bottom" STYLE="BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" NOWRAP ALIGN="center" STYLE="BORDER-RIGHT:1px solid #000000; BORDER-BOTTOM:1px solid #000000"><FONT FACE="Times New Roman" SIZE="2">$73,575,000.00</FONT></TD>
<TD VALIGN="bottom" STYLE="BORDER-BOTTOM:1px solid #000000"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top" NOWRAP ALIGN="center" STYLE="BORDER-BOTTOM:1px solid #000000"><FONT FACE="Times New Roman" SIZE="2">$8,659.78(3)</FONT></TD></TR>

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<TD VALIGN="top" STYLE="BORDER-BOTTOM:1px solid #000000; padding-left:8px"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT FACE="Times New Roman" SIZE="2">
Common Stock, $0.01 par value per share, issuable<BR>upon restricted stock awards or restricted stock<BR>units under 2005 Incentive Plan</FONT></P></TD>
<TD VALIGN="bottom" STYLE="BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top" NOWRAP ALIGN="center" STYLE="BORDER-RIGHT:1px solid #000000; BORDER-BOTTOM:1px solid #000000"><FONT FACE="Times New Roman" SIZE="2">11,569,326&nbsp;shares(4)</FONT></TD>
<TD VALIGN="bottom" STYLE="BORDER-BOTTOM:1px solid #000000"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top" NOWRAP ALIGN="center" STYLE="BORDER-BOTTOM:1px solid #000000"><FONT FACE="Times New Roman" SIZE="2">(5)</FONT></TD>
<TD VALIGN="bottom" STYLE="BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" NOWRAP ALIGN="center" STYLE="BORDER-RIGHT:1px solid #000000; BORDER-BOTTOM:1px solid #000000"><FONT FACE="Times New Roman" SIZE="2">(5)</FONT></TD>
<TD VALIGN="bottom" STYLE="BORDER-BOTTOM:1px solid #000000"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top" NOWRAP ALIGN="center" STYLE="BORDER-BOTTOM:1px solid #000000"><FONT FACE="Times New Roman" SIZE="2">(5)</FONT></TD></TR>

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<TD WIDTH="1%" VALIGN="top" ALIGN="left"><FONT FACE="Times New Roman" SIZE="1">(1)&nbsp;&nbsp;</FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT FACE="Times New Roman" SIZE="1">This registration statement shall also cover any additional shares of common stock that become issuable by reason of any stock dividend, stock split, recapitalization or other
similar transaction effected without the receipt of consideration that results in an increase in the number of the outstanding shares of common stock. </FONT></TD></TR></TABLE>
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<TR>
<TD WIDTH="1%" VALIGN="top" ALIGN="left"><FONT FACE="Times New Roman" SIZE="1">(2)&nbsp;&nbsp;</FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT FACE="Times New Roman" SIZE="1">The proposed  maximum  offering price per share was determined  pursuant to Rule 457(h)  under the Securities Act of 1933 to be
     equal to $27.25  per  share,  the  average  of the high and low  price of the  registrant's  common  stock as  reported  on The
     Nasdaq Stock Market on August 18, 2005. </FONT></TD></TR></TABLE>
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<TR>
<TD WIDTH="1%" VALIGN="top" ALIGN="left"><FONT FACE="Times New Roman" SIZE="1">(3)&nbsp;&nbsp;</FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT FACE="Times New Roman" SIZE="1">The amount of the  registration  fee was  calculated  pursuant to Section  6(b) of the  Securities  Act,  which states that the
     adjusted  fee rate for fiscal 2005 shall be "$117.70  per $1 million"  of the  maximum  aggregate  offering  price at which the
     securities  are proposed to be offered.  The  registration  fee is therefore  calculated by  multiplying  the proposed  maximum
     aggregate offering price by 0.0001177.
</FONT></TD></TR>
<TR>
<TD WIDTH="1%" VALIGN="top" ALIGN="left"><FONT FACE="Times New Roman" SIZE="1">(4)&nbsp;&nbsp;</FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT FACE="Times New Roman" SIZE="1">Such shares of common stock consist of (a) up to 2,127,736  shares of common stock reserved but unissued under the Registrant's
     Amended and Restated 1994 Incentive Plan (the &#147;1994 Plan&#148;) that have been  transferred to the 2005 Incentive Plan and (b) up to
     9,441,590  shares of common stock  subject to options  outstanding  under the 1994 Plan that shall be  transferred  to the 2005
     Incentive Plan and will be reserved for issuance under the 2005 Incentive Plan if such options expire without being exercised.
</FONT></TD></TR>
<TR>
<TD WIDTH="1%" VALIGN="top" ALIGN="left"><FONT FACE="Times New Roman" SIZE="1">(5)&nbsp;&nbsp;</FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT FACE="Times New Roman" SIZE="1">With respect to such 11,569,326 shares of common stock being registered under the 2005 Incentive Plan, the Registrant has
     previously paid the filing fee for such shares as such shares were previously registered pursuant to registration statements
     on Form S-8 (registration numbers:  33-91608; 333-91671; 333-118034) (the "Prior Registration Statements").  The Registrant is
     filing post-effective amendments to such Prior Registration Statements to reflect the transfer of such shares to this
     Registration Statement.
</FONT></TD></TR>
</TABLE>


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<H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=4>PART II </FONT></H1>

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<H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=4>INFORMATION REQUIRED
IN THE REGISTRATION STATEMENT </FONT></H1>

<!-- MARKER FORMAT-SHEET="Head Major Left Bold" FSL="Default" -->
<H1 ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=3>Item 3.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Incorporation of Documents
by Reference. </FONT></H1>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
following documents and information have been filed by National Instruments Corporation
(the &#147;Registrant&#148;) with the Securities and Exchange Commission (the
&#147;SEC&#148;) and are incorporated herein by reference:
</FONT></P>

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          <TD ALIGN=RIGHT WIDTH=9%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>a. </FONT></TD>
          <TD ALIGN=LEFT WIDTH=3%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp; </FONT></TD>
          <TD WIDTH=88%><P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
          The Registrant&#146;s Annual Report on Form 10-K for year ended December 31, 2004,
        filed with the SEC on March 7, 2005. </FONT></P></TD>
          </TR>
          </TABLE>
          <BR>

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          <TD ALIGN=RIGHT WIDTH=9%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>b. </FONT></TD>
          <TD ALIGN=LEFT WIDTH=3%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp; </FONT></TD>
          <TD WIDTH=88%><P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
           The Registrant&#146;s Quarterly Report on Form 10-Q for the three months ended March
                31, 2005, filed with the SEC on April 28, 2005.</FONT></P></TD>
          </TR>
          </TABLE>
          <BR>




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          <TD ALIGN=RIGHT WIDTH=9%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>c. </FONT></TD>
          <TD ALIGN=LEFT WIDTH=3%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp; </FONT></TD>
          <TD WIDTH=88%><P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
          The Registrant&#146;s Quarterly Report on Form 10-Q for the three months ended
          June 30, 2005, filed with the SEC on August 9, 2005. </FONT></P></TD>
          </TR>
          </TABLE>
          <BR>

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          <TD ALIGN=RIGHT WIDTH=9%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>d. </FONT></TD>
          <TD ALIGN=LEFT WIDTH=3%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp; </FONT></TD>
          <TD WIDTH=88%><P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
          The Registrant&#146;s Current Reports on Form 8-K filed with the SEC on May 13,
          2005, June 15, 2005, June 21, 2005 and August 5, 2005. </FONT></P></TD>
          </TR>
          </TABLE>
          <BR>

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          <TD ALIGN=RIGHT WIDTH=9%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>e. </FONT></TD>
          <TD ALIGN=LEFT WIDTH=3%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp; </FONT></TD>
          <TD WIDTH=88%><P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
          The Registrant&#146;s description of authorized capital stock contained in its
          registration statement filed under Section 12 of the Exchange Act, including any
          amendment or report filed for the purpose of updating the description. </FONT></P></TD>
          </TR>
          </TABLE>
          <BR>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;All
documents subsequently filed by the Registrant pursuant to Sections&nbsp;13(a), 13(c), 14
and 15(d) of the Exchange Act prior to the filing of a post-effective amendment that
indicates that all securities offered have been sold or that deregisters all securities
then remaining unsold, shall be deemed to be incorporated by reference in this
registration statement and to be part hereof from the date of filing of such documents. </FONT></P>

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<H1 ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=3>Item 4.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Description of
Securities. </FONT></H1>

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<P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not
applicable. </FONT></P>

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<H1 ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=3>Item 5.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Interests of
Named Experts and Counsel. </FONT></H1>

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<P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not
applicable. </FONT></P>

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<H1 ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=3>Item 6.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Indemnification
of Directors and Officers. </FONT></H1>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section
145(a) of the Delaware General Corporation Law provides, in general, that a corporation
shall have the power to indemnify any person who was or is a party or is threatened to be
made a party to any threatened, pending or completed action, suit or proceeding, whether
civil, criminal, administrative or investigative (other than an action by or in the right
of the corporation), because the person is or was a director or officer of the
corporation. Such indemnity may be against expenses (including attorneys&#146; fees),
judgments, fines and amounts paid in settlement actually and reasonably incurred by the
person in connection with such action, suit or proceeding, if the person acted in good
faith and in a manner the person reasonably believed to be in or not opposed to the best
interests of the corporation and if, with respect to any criminal action or proceeding,
the person did not have reasonable cause to believe the person&#146;s conduct was
unlawful. </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section
145(b) of the Delaware General Corporation Law provides, in general, that a corporation
shall have the power to indemnify any person who was or is a party or is threatened to be
made a party to any threatened, pending or completed action or suit by or in the right of
the corporation to procure a judgment in its favor because the person is or was a director
or officer of the corporation, against any expenses (including attorneys&#146; fees)
actually and reasonably incurred by the person in connection with the defense or
settlement of such action or suit if the person acted in good faith and in a manner the
person reasonably believed to be in or not opposed to the best interests of the
corporation. </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section
145(g) of the Delaware General Corporation Law provides, in general, that a corporation
shall have the power to purchase and maintain insurance on behalf of any person who is or
was a director or officer of the corporation against any liability asserted against the
person in any such capacity, or arising out of the person&#146;s status as such, whether
or not the corporation would have the power to indemnify the person against such liability
under the provisions of the law. </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Registrant&#146;s certificate of incorporation, as amended, provides that, subject to
certain limited exceptions, the Registrant may indemnify its directors and officers to the
extent authorized or permitted by the Delaware General Corporation Law. The
Registrant&#146;s directors and officers are insured under policies of insurance
maintained by the Registrant, subject to the limits of the policies, against certain
losses arising from any claims made against them by reason of being or having been such
directors or officers. In addition, the Registrant has entered into contracts with certain
of its directors and officers providing for indemnification of such persons by the
Registrant to the full extent authorized or permitted by law, subject to certain limited
exceptions. </FONT></P>

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<H1 ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=3>Item 7.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Exemption From
Registration Claimed. </FONT></H1>

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<P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not
applicable.</FONT></P>

<!-- MARKER FORMAT-SHEET="Head Major Left Bold" FSL="Default" -->
<H1 ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=3>Item 8.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Exhibits. </FONT></H1>


<TABLE CELLPADDING=0 CELLSPACING=0 BORDER=0 WIDTH=100%>
<TR VALIGN=Bottom>
     <TH COLSPAN=2><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Exhibit<BR>Number</FONT></TH>
     <TH COLSPAN=2><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Document</FONT></TH></TR>
<TR VALIGN=top>
     <TD WIDTH=3% ALIGN=RIGHT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>4</FONT></TD>
        <TD WIDTH=5% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>.1</FONT></TD>
     <TD WIDTH=91% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>2005 Incentive Plan</FONT></TD>
     <TD WIDTH=1% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>
<TR VALIGN=top>
     <TD ALIGN=RIGHT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>4</FONT></TD>
        <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>.2</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Form of Restricted Stock Unit Award Agreement (Non-Employee Director),
incorporated by reference to exhibit 10.3 filed with the Company's Current Report on Form 8-K filed on August 5, 2005.</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>

<TR VALIGN=top>
     <TD ALIGN=RIGHT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>4</FONT></TD>
        <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>.3</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Form of Restricted Stock Unit Award Agreement (Performance Vesting),
 incorporated by reference to exhibit 10.4 filed with the Company's Current Report on Form 8-K filed on August 5, 2005.</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>

<TR VALIGN=top>
     <TD ALIGN=RIGHT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>4</FONT></TD>
        <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>.4</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Form of Restricted Stock Unit Award Agreement (Current Employee), incorporated by reference to exhibit
10.5 filed with the Company's Current Report on Form 8-K filed on August 5, 2005.</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>

<TR VALIGN=top>
     <TD ALIGN=RIGHT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>4</FONT></TD>
        <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>.5</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Form of Restricted Stock Unit Award Agreement (Newly Hired Employee),
incorporated by reference to exhibit 10.6 filed with the Company's Current Report on Form 8-K filed on August 5, 2005.</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>

<TR VALIGN=top>
     <TD ALIGN=RIGHT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>5</FONT></TD>
        <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>.1</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Opinion of Wilson Sonsini Goodrich &amp; Rosati, Professional Corporation.</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>
<TR VALIGN=top>
     <TD ALIGN=RIGHT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>23</FONT></TD>
        <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>.1</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Consent of PricewaterhouseCoopers LLP, independent accountants.</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>
<TR VALIGN=top>
     <TD ALIGN=RIGHT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>23</FONT></TD>
        <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>.2</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Consent of Wilson Sonsini Goodrich &amp; Rosati, Professional Corporation (included in Exhibit 5.1).</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>
<TR VALIGN=top>
     <TD ALIGN=RIGHT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>24</FONT></TD>
        <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>.1</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Power of Attorney (see page II-4 of this Form S-8).</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>
</TABLE>




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<H1 ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=3>Item 9.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Undertakings. </FONT></H1>

<!-- MARKER FORMAT-SHEET="Para (List) Indent" FSL="Default" -->
     <P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
          The undersigned registrant hereby undertakes: </FONT></P>

<!-- MARKER FORMAT-SHEET="Para (List) Indent" FSL="Default" -->
     <P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
          To file, during any period in which offers or sales are being made, a
          post-effective amendment to this registration statement to include any material
          information with respect to the plan of distribution not previously disclosed in
          the registration statement or any material change to such information in the
          registration statement. </FONT></P>

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     <P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
          That, for the purpose of determining any liability under the Securities Act of
          1933, each such post-effective amendment shall be deemed to be a new
          registration statement relating to the securities offered therein, and the
          offering of such securities at that time shall be deemed to be the initial bona
          fide offering thereof. </FONT></P>

<!-- MARKER FORMAT-SHEET="Para (List) Indent" FSL="Default" -->
     <P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
          To remove from registration by means of a post-effective amendment any of the
          securities being registered which remain unsold at the termination of the
          offering. </FONT></P>

<!-- MARKER FORMAT-SHEET="Para (List) Indent" FSL="Default" -->
     <P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
          That, for purposes of determining any liability under the Securities Act of
          1933, each filing of the registrant&#146;s annual report pursuant to
          Section&nbsp;13(a) or Section&nbsp;15(d) of the Securities Exchange Act of 1934
          (and, where applicable, each filing of an employee benefit plan&#146;s annual
          report pursuant to Section&nbsp;15(d) of the Securities Exchange Act of 1934)
          that is incorporated by reference in the registration statement shall be deemed
          to be a new registration statement relating to the securities offered therein,
          and the offering of such securities at that time shall be deemed to be the
          initial bona fide offering thereof. </FONT></P>

<!-- MARKER FORMAT-SHEET="Para (List) Indent" FSL="Default" -->
     <P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
          Insofar as indemnification for liabilities arising under the Securities Act of
          1933 may be permitted to directors, officers and controlling persons of the
          registrant pursuant to Item&nbsp;6 of Part&nbsp;II of this registration
          statement, or otherwise, the registrant has been advised that in the opinion of
          the Securities and Exchange Commission such indemnification is against public
          policy as expressed in the Securities Act of 1933 and is, therefore,
          unenforceable. In the event that a claim for indemnification against such
          liabilities (other than the payment by the registrant of expenses incurred or
          paid by a director, officer or controlling person of the registrant in the
          successful defense of any action, suit or proceeding) is asserted by such
          director, officer or controlling person in connection with the securities being
          registered, the registrant will, unless in the opinion of its counsel the matter
          has been settled by controlling precedent, submit to a court of appropriate
          jurisdiction the question whether such indemnification by it is against public
          policy as expressed in the Securities Act of 1933 and will be governed by the
          final adjudication of such issue. </FONT></P>


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<!-- MARKER FORMAT-SHEET="Head Major Center Bold" FSL="Default" -->
<H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=4>SIGNATURES </FONT></H1>

<!-- MARKER FORMAT-SHEET="Para Large Indent" FSL="Default" -->
<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, the registrant certifies that it has
reasonable grounds to believe that it meets all of the requirements for filing on
Form&nbsp;S-8 and has duly caused this registration statement to be signed on its behalf
by the undersigned, thereunto duly authorized, in the City of Austin, State of Texas, on
August 22, 2005. </FONT></P>


<TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0">
<TR VALIGN="BOTTOM">
     <TH><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT></TH>
     <TH><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT></TH></TR>
<TR VALIGN="TOP">
     <TD WIDTH="50%"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT></TD>
     <TD WIDTH="50%"> <FONT FACE="Times New Roman, Times, Serif" SIZE="2">NATIONAL INSTRUMENTS CORPORATION<BR><BR>By: /s/James J. Truchard<BR>
Dr. James J. Truchard<BR>Chairman of the Board and President </FONT></TD></TR>
</TABLE>
                                                                                                       <!-- MARKER FORMAT-SHEET="Para Large Indent" FSL="Default" -->
<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;KNOW
ALL PERSONS BY THESE PRESENT, that each person whose signature appears below constitutes
and appoints Dr. James J. Truchard and Alexander M. Davern, and each of them individually,
as his true and lawful attorneys-in-fact and agents with full power of substitution and
resubstitution, for him and in his name, place and stead, in any and all capacities to
sign the registration statement filed herewith and any or all amendments to said
registration statement with exhibits thereto and other documents in connection therewith,
with the SEC, hereby ratifying and confirming all that each of said attorneys-in-fact, or
his substitute or substitutes, may do or cause to be done by virtue hereof. </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, this registration statement has been
signed by the following persons in the capacities and on the dates indicated. </FONT></P>


<TABLE WIDTH="70%" BORDER="0" CELLPADDING="0" CELLSPACING="0">
<TR VALIGN="BOTTOM">
     <TH><FONT FACE="Times New Roman, Times, Serif" SIZE="2">Signature</FONT></TH>
     <TH><FONT FACE="Times New Roman, Times, Serif" SIZE="2"> Title</FONT></TH>
     <TH><FONT FACE="Times New Roman, Times, Serif" SIZE="2">Date</FONT></TH></TR>
<TR VALIGN="TOP">
     <TD WIDTH="30%"><FONT FACE="Times New Roman, Times, Serif" SIZE="2">/s/James J. Truchard <BR>
Dr. James J. Truchard
</FONT></TD>
     <TD WIDTH="50%"><FONT FACE="Times New Roman, Times, Serif" SIZE="2">Chairman of the Board and President<BR>
(Principal Executive Officer)
</FONT></TD>
     <TD WIDTH="20%"><FONT FACE="Times New Roman, Times, Serif" SIZE="2">August 22, 2005</FONT></TD></TR>
<TR VALIGN="TOP">
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR>/s/ Alexander M. Davern<BR>
Alexander M. Davern
</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR>Chief Financial Officer and Treasurer<BR>
(Principal Financial and Accounting Officer)
</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR>August 19, 2005
</FONT></TD></TR>
<TR VALIGN="TOP">
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR>/s/ Jeffrey L. Kodosky<BR>
Jeffrey L. Kodosky
</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR>Director
</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR>August 16, 2005
</FONT></TD></TR>
<TR VALIGN="TOP">
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR>/s/ Donald M. Carlton <BR>
Dr. Donald M. Carlton
</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR>Director
</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR>August 12, 2005
</FONT></TD></TR>
<TR VALIGN="TOP">
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR>/s/ Ben G. Streetman<BR>
Ben G. Streetman
</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR>Director
</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR>August 11, 2005
</FONT></TD></TR>
<TR VALIGN="TOP">
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR>/s/ R. Gary Daniels<BR>
R. Gary Daniels
</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR>Director
</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR>August 13, 2005
</FONT></TD></TR>
<TR VALIGN="TOP">
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR>/s/ Charles J. Roesslein<BR>
Charles J. Roesslein
</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR>Director
</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR>August 11, 2005
</FONT></TD></TR>
<TR VALIGN="TOP">
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR>/s/ Duy-Loan T. Le<BR>
Duy-Loan T. Le
</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR>Director
</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR>August 19, 2005
</FONT></TD></TR>
</TABLE>



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<H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=4>INDEX TO EXHIBITS </FONT></H1>

<TABLE CELLPADDING=0 CELLSPACING=0 BORDER=0 WIDTH=100%>
<TR VALIGN=Bottom>
     <TH COLSPAN=2><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Exhibit<BR>Number</FONT></TH>
     <TH COLSPAN=2><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Document</FONT></TH></TR>
<TR VALIGN=top>
     <TD WIDTH=3% ALIGN=RIGHT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>4</FONT></TD>
        <TD WIDTH=5% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>.1</FONT></TD>
     <TD WIDTH=91% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>2005 Incentive Plan</FONT></TD>
     <TD WIDTH=1% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>
<TR VALIGN=top>
     <TD ALIGN=RIGHT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>4</FONT></TD>
        <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>.2</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Form of Restricted Stock Unit Award Agreement (Non-Employee Director),
incorporated by reference to exhibit 10.3 filed with the Company's Current Report on Form 8-K filed on August 5, 2005.</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>

<TR VALIGN=top>
     <TD ALIGN=RIGHT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>4</FONT></TD>
        <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>.3</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Form of Restricted Stock Unit Award Agreement (Performance Vesting),
 incorporated by reference to exhibit 10.4 filed with the Company's Current Report on Form 8-K filed on August 5, 2005.</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>

<TR VALIGN=top>
     <TD ALIGN=RIGHT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>4</FONT></TD>
        <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>.4</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Form of Restricted Stock Unit Award Agreement (Current Employee), incorporated by reference to exhibit
10.5 filed with the Company's Current Report on Form 8-K filed on August 5, 2005.</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>

<TR VALIGN=top>
     <TD ALIGN=RIGHT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>4</FONT></TD>
        <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>.5</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Form of Restricted Stock Unit Award Agreement (Newly Hired Employee),
incorporated by reference to exhibit 10.6 filed with the Company's Current Report on Form 8-K filed on August 5, 2005.</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>

<TR VALIGN=top>
     <TD ALIGN=RIGHT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>5</FONT></TD>
        <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>.1</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Opinion of Wilson Sonsini Goodrich &amp; Rosati, Professional Corporation.</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>
<TR VALIGN=top>
     <TD ALIGN=RIGHT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>23</FONT></TD>
        <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>.1</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Consent of PricewaterhouseCoopers LLP, independent accountants.</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>
<TR VALIGN=top>
     <TD ALIGN=RIGHT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>23</FONT></TD>
        <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>.2</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Consent of Wilson Sonsini Goodrich &amp; Rosati, Professional Corporation (included in Exhibit 5.1).</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>
<TR VALIGN=top>
     <TD ALIGN=RIGHT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>24</FONT></TD>
        <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>.1</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Power of Attorney (see page II-4 of this Form S-8).</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>
</TABLE>

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{"company-data": {"conformed-name": "NATIONAL INSTRUMENTS CORP /DE/", "cik": "0000935494", "assigned-sic": "7372", "irs-number": "741871327", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-127751", "film-number": "051041547"}, "business-address": {"street1": "11500 NORTH MOPAC EXPRESSWAY", "city": "AUSTIN", "state": "TX", "zip": "78759", "phone": "5123389119"}, "mail-address": {"street1": "11500 NORTH MOPAC EXPRESSWAY", "city": "AUSTIN", "state": "TX", "zip": "78759"}}
FORM S-8
As filed with the Securities and Exchange Commission on August 22, 2005
Registration No. 333 -______
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM S-8
REGISTRATION STATEMENT
Under
The Securities Act of 1933
NATIONAL INSTRUMENTS
CORPORATION
(Exact name of registrant as specified in its charter)
Delaware
74-1871327
(State or other jurisdiction of
incorporation or organization)
(I.R.S. Employer
Identification Number)
11500 North MoPac
Expressway
Austin, Texas 78759
(Address, including zip code, of registrant's principal executive offices)
2005 Incentive Plan
(Full title of the Plan)
David G. Hugley
Vice President, General Counsel; Secretary
National Instruments Corporation
11500 North Mopac Expressway
Austin, Texas 78759
(512) 338-9119
(Name, address, and telephone number, including area code, of agent for service)
Copy to:
J. Robert Suffoletta, Jr.
Wilson Sonsini Goodrich & Rosati
Professional Corporation
8911 Capital of Texas Highway, North
Westech 360, Suite 3350
Austin, Texas 78759-7247
CALCULATION OF REGISTRATION FEE
Title of securities
to
be registered
Amount
to be registered (1)
Proposed maximum offering price per share
Proposed maximum aggregate offering price
Amount of registration
fee
Common Stock, $0.01 par value per share, issuable
upon restricted stock awards or restricted units
under 2005 Incentive Plan
2,700,000 shares
$27.25(2)
$73,575,000.00
$8,659.78(3)
Common Stock, $0.01 par value per share, issuable
upon restricted stock awards or restricted stock
units under 2005 Incentive Plan
11,569,326 shares(4)
(5)
(5)
(5)
(1)
This registration statement shall also cover any additional shares of common stock that become issuable by reason of any stock dividend, stock split, recapitalization or other
similar transaction effected without the receipt of consideration that results in an increase in the number of the outstanding shares of common stock.
(2)
The proposed  maximum  offering price per share was determined  pursuant to Rule 457(h)  under the Securities Act of 1933 to be
     equal to $27.25  per  share,  the  average  of the high and low  price of the  registrant's  common  stock as  reported  on The
     Nasdaq Stock Market on August 18, 2005.
(3)
The amount of the  registration  fee was  calculated  pursuant to Section  6(b) of the  Securities  Act,  which states that the
     adjusted  fee rate for fiscal 2005 shall be "$117.70  per $1 million"  of the  maximum  aggregate  offering  price at which the
     securities  are proposed to be offered.  The  registration  fee is therefore  calculated by  multiplying  the proposed  maximum
     aggregate offering price by 0.0001177.
(4)
Such shares of common stock consist of (a) up to 2,127,736  shares of common stock reserved but unissued under the Registrant's
     Amended and Restated 1994 Incentive Plan (the "1994 Plan") that have been  transferred to the 2005 Incentive Plan and (b) up to
     9,441,590  shares of common stock  subject to options  outstanding  under the 1994 Plan that shall be  transferred  to the 2005
     Incentive Plan and will be reserved for issuance under the 2005 Incentive Plan if such options expire without being exercised.
(5)
With respect to such 11,569,326 shares of common stock being registered under the 2005 Incentive Plan, the Registrant has
     previously paid the filing fee for such shares as such shares were previously registered pursuant to registration statements
     on Form S-8 (registration numbers:  33-91608; 333-91671; 333-118034) (the "Prior Registration Statements").  The Registrant is
     filing post-effective amendments to such Prior Registration Statements to reflect the transfer of such shares to this
     Registration Statement.
PART II
INFORMATION REQUIRED
IN THE REGISTRATION STATEMENT
Item 3.      Incorporation of Documents
by Reference.
The
following documents and information have been filed by National Instruments Corporation
(the "Registrant") with the Securities and Exchange Commission (the
"SEC") and are incorporated herein by reference:
a.
The Registrant's Annual Report on Form 10-K for year ended December 31, 2004,
        filed with the SEC on March 7, 2005.
b.
The Registrant's Quarterly Report on Form 10-Q for the three months ended March
                31, 2005, filed with the SEC on April 28, 2005.
c.
The Registrant's Quarterly Report on Form 10-Q for the three months ended
          June 30, 2005, filed with the SEC on August 9, 2005.
d.
The Registrant's Current Reports on Form 8-K filed with the SEC on May 13,
          2005, June 15, 2005, June 21, 2005 and August 5, 2005.
e.
The Registrant's description of authorized capital stock contained in its
          registration statement filed under Section 12 of the Exchange Act, including any
          amendment or report filed for the purpose of updating the description.
All
documents subsequently filed by the Registrant pursuant to Sections 13(a), 13(c), 14
and 15(d) of the Exchange Act prior to the filing of a post-effective amendment that
indicates that all securities offered have been sold or that deregisters all securities
then remaining unsold, shall be deemed to be incorporated by reference in this
registration statement and to be part hereof from the date of filing of such documents.
Item 4.      Description of
Securities.
Not
applicable.
Item 5.      Interests of
Named Experts and Counsel.
Not
applicable.
Item 6.      Indemnification
of Directors and Officers.
Section
145(a) of the Delaware General Corporation Law provides, in general, that a corporation
shall have the power to indemnify any person who was or is a party or is threatened to be
made a party to any threatened, pending or completed action, suit or proceeding, whether
civil, criminal, administrative or investigative (other than an action by or in the right
of the corporation), because the person is or was a director or officer of the
corporation. Such indemnity may be against expenses (including attorneys' fees),
judgments, fines and amounts paid in settlement actually and reasonably incurred by the
person in connection with such action, suit or proceeding, if the person acted in good
faith and in a manner the person reasonably believed to be in or not opposed to the best
interests of the corporation and if, with respect to any criminal action or proceeding,
the person did not have reasonable cause to believe the person's conduct was
unlawful.
Section
145(b) of the Delaware General Corporation Law provides, in general, that a corporation
shall have the power to indemnify any person who was or is a party or is threatened to be
made a party to any threatened, pending or completed action or suit by or in the right of
the corporation to procure a judgment in its favor because the person is or was a director
or officer of the corporation, against any expenses (including attorneys' fees)
actually and reasonably incurred by the person in connection with the defense or
settlement of such action or suit if the person acted in good faith and in a manner the
person reasonably believed to be in or not opposed to the best interests of the
corporation.
Section
145(g) of the Delaware General Corporation Law provides, in general, that a corporation
shall have the power to purchase and maintain insurance on behalf of any person who is or
was a director or officer of the corporation against any liability asserted against the
person in any such capacity, or arising out of the person's status as such, whether
or not the corporation would have the power to indemnify the person against such liability
under the provisions of the law.
The
Registrant's certificate of incorporation, as amended, provides that, subject to
certain limited exceptions, the Registrant may indemnify its directors and officers to the
extent authorized or permitted by the Delaware General Corporation Law. The
Registrant's directors and officers are insured under policies of insurance
maintained by the Registrant, subject to the limits of the policies, against certain
losses arising from any claims made against them by reason of being or having been such
directors or officers. In addition, the Registrant has entered into contracts with certain
of its directors and officers providing for indemnification of such persons by the
Registrant to the full extent authorized or permitted by law, subject to certain limited
exceptions.
Item 7.      Exemption From
Registration Claimed.
Not
applicable.
Item 8.      Exhibits.
Exhibit
Number
Document
4
.1
2005 Incentive Plan
4
.2
Form of Restricted Stock Unit Award Agreement (Non-Employee Director),
incorporated by reference to exhibit 10.3 filed with the Company's Current Report on Form 8-K filed on August 5, 2005.
4
.3
Form of Restricted Stock Unit Award Agreement (Performance Vesting),
 incorporated by reference to exhibit 10.4 filed with the Company's Current Report on Form 8-K filed on August 5, 2005.
4
.4
Form of Restricted Stock Unit Award Agreement (Current Employee), incorporated by reference to exhibit
10.5 filed with the Company's Current Report on Form 8-K filed on August 5, 2005.
4
.5
Form of Restricted Stock Unit Award Agreement (Newly Hired Employee),
incorporated by reference to exhibit 10.6 filed with the Company's Current Report on Form 8-K filed on August 5, 2005.
5
.1
Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation.
23
.1
Consent of PricewaterhouseCoopers LLP, independent accountants.
23
.2
Consent of Wilson Sonsini Goodrich & Rosati, Professional Corporation (included in Exhibit 5.1).
24
.1
Power of Attorney (see page II-4 of this Form S-8).
Item 9.      Undertakings.
(a)       
          The undersigned registrant hereby undertakes:
(1)       
          To file, during any period in which offers or sales are being made, a
          post-effective amendment to this registration statement to include any material
          information with respect to the plan of distribution not previously disclosed in
          the registration statement or any material change to such information in the
          registration statement.
(2)       
          That, for the purpose of determining any liability under the Securities Act of
          1933, each such post-effective amendment shall be deemed to be a new
          registration statement relating to the securities offered therein, and the
          offering of such securities at that time shall be deemed to be the initial bona
          fide offering thereof.
(3)       
          To remove from registration by means of a post-effective amendment any of the
          securities being registered which remain unsold at the termination of the
          offering.
(b)       
          That, for purposes of determining any liability under the Securities Act of
          1933, each filing of the registrant's annual report pursuant to
          Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934
          (and, where applicable, each filing of an employee benefit plan's annual
          report pursuant to Section 15(d) of the Securities Exchange Act of 1934)
          that is incorporated by reference in the registration statement shall be deemed
          to be a new registration statement relating to the securities offered therein,
          and the offering of such securities at that time shall be deemed to be the
          initial bona fide offering thereof.
(c)       
          Insofar as indemnification for liabilities arising under the Securities Act of
          1933 may be permitted to directors, officers and controlling persons of the
          registrant pursuant to Item 6 of Part II of this registration
          statement, or otherwise, the registrant has been advised that in the opinion of
          the Securities and Exchange Commission such indemnification is against public
          policy as expressed in the Securities Act of 1933 and is, therefore,
          unenforceable. In the event that a claim for indemnification against such
          liabilities (other than the payment by the registrant of expenses incurred or
          paid by a director, officer or controlling person of the registrant in the
          successful defense of any action, suit or proceeding) is asserted by such
          director, officer or controlling person in connection with the securities being
          registered, the registrant will, unless in the opinion of its counsel the matter
          has been settled by controlling precedent, submit to a court of appropriate
          jurisdiction the question whether such indemnification by it is against public
          policy as expressed in the Securities Act of 1933 and will be governed by the
          final adjudication of such issue.
SIGNATURES
Pursuant
to the requirements of the Securities Act of 1933, the registrant certifies that it has
reasonable grounds to believe that it meets all of the requirements for filing on
Form S-8 and has duly caused this registration statement to be signed on its behalf
by the undersigned, thereunto duly authorized, in the City of Austin, State of Texas, on
August 22, 2005.
NATIONAL INSTRUMENTS CORPORATION
By: /s/James J. Truchard
Dr. James J. Truchard
Chairman of the Board and President
KNOW
ALL PERSONS BY THESE PRESENT, that each person whose signature appears below constitutes
and appoints Dr. James J. Truchard and Alexander M. Davern, and each of them individually,
as his true and lawful attorneys-in-fact and agents with full power of substitution and
resubstitution, for him and in his name, place and stead, in any and all capacities to
sign the registration statement filed herewith and any or all amendments to said
registration statement with exhibits thereto and other documents in connection therewith,
with the SEC, hereby ratifying and confirming all that each of said attorneys-in-fact, or
his substitute or substitutes, may do or cause to be done by virtue hereof.
Pursuant
to the requirements of the Securities Act of 1933, this registration statement has been
signed by the following persons in the capacities and on the dates indicated.
Signature
Title
Date
/s/James J. Truchard
Dr. James J. Truchard
Chairman of the Board and President
(Principal Executive Officer)
August 22, 2005
/s/ Alexander M. Davern
Alexander M. Davern
Chief Financial Officer and Treasurer
(Principal Financial and Accounting Officer)
August 19, 2005
/s/ Jeffrey L. Kodosky
Jeffrey L. Kodosky
Director
August 16, 2005
/s/ Donald M. Carlton
Dr. Donald M. Carlton
Director
August 12, 2005
/s/ Ben G. Streetman
Ben G. Streetman
Director
August 11, 2005
/s/ R. Gary Daniels
R. Gary Daniels
Director
August 13, 2005
/s/ Charles J. Roesslein
Charles J. Roesslein
Director
August 11, 2005
/s/ Duy-Loan T. Le
Duy-Loan T. Le
Director
August 19, 2005
INDEX TO EXHIBITS
Exhibit
Number
Document
4
.1
2005 Incentive Plan
4
.2
Form of Restricted Stock Unit Award Agreement (Non-Employee Director),
incorporated by reference to exhibit 10.3 filed with the Company's Current Report on Form 8-K filed on August 5, 2005.
4
.3
Form of Restricted Stock Unit Award Agreement (Performance Vesting),
 incorporated by reference to exhibit 10.4 filed with the Company's Current Report on Form 8-K filed on August 5, 2005.
4
.4
Form of Restricted Stock Unit Award Agreement (Current Employee), incorporated by reference to exhibit
10.5 filed with the Company's Current Report on Form 8-K filed on August 5, 2005.
4
.5
Form of Restricted Stock Unit Award Agreement (Newly Hired Employee),
incorporated by reference to exhibit 10.6 filed with the Company's Current Report on Form 8-K filed on August 5, 2005.
5
.1
Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation.
23
.1
Consent of PricewaterhouseCoopers LLP, independent accountants.
23
.2
Consent of Wilson Sonsini Goodrich & Rosati, Professional Corporation (included in Exhibit 5.1).
24
.1
Power of Attorney (see page II-4 of this Form S-8).