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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 earliest event reported) July 27, 2005
                                                         --------------


                             FAIR ISAAC CORPORATION
                             ----------------------
             (Exact name of registrant as specified in its charter)


          Delaware                     0-16439                  94-1499887
          --------                     -------                  ----------
(State or other jurisdiction         (Commission              (IRS Employer
      of incorporation)              File Number)           Identification No.)

    901 Marquette Avenue, Suite 3200
         Minneapolis, Minnesota                                55402-3232
         ----------------------                                ----------
(Address of principal executive offices)                       (Zip Code)


         Registrant's telephone number, including area code  612-758-5200
                                                           --------------

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))

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                                TABLE OF CONTENTS


Item 2.02     Results of Operations and Financial Condition.
Item 9.01     Financial Statements and Exhibits.

Signature
Exhibit Index
Exhibit 99.1


                                       i




                                        1
Item 2.02     Results of Operations and Financial Condition.

     On July 27,  2005,  Fair Isaac  Corporation  (the  "Company")  reported its
financial  results for the quarter and nine months ended June 30, 2005.  See the
Company's press release dated July 27, 2005,  which is furnished as Exhibit 99.1
hereto and incorporated by reference in this Item 2.02.


Item 9.01     Financial Statements and Exhibits.

     (c) Exhibits.

          Exhibit
           Number                            Description
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            99.1                 Press Release dated July 27, 2005


                                       1




                                    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.

                                      FAIR ISAAC CORPORATION

                                      By /s/   CHARLES M. OSBORNE
                                         --------------------------------
                                      Charles M. Osborne
                                      Vice President and Chief Financial Officer
Date:  July 27, 2005


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                                  EXHIBIT INDEX

    Exhibit
    Number                  Description                   Method of Filing
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      99.1        Press Release dated July 27, 2005      Filed Electronically