SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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                                    FORM 6-K

                            Report of Foreign Issuer

                        Pursuant to Rule 13a-16 or 15d-16

                    under the Securities Exchange Act of 1934

                              Dated August 10, 2005

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                        Commission File Number: 001-14666

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                            MITTAL STEEL COMPANY N.V.

                 (Translation of registrant's name into English)

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                             15th Floor, Hofplein 20
                                3032 AC Rotterdam
                                 The Netherlands
              (Address of registrant's principal executive offices)

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         Indicate by check mark whether the registrant files or will file annual
reports under cover Form 20-F or Form 40-F.

                            Form 20-F  X    Form 40-F 
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         Indicate by check mark if the registrant is submitting the Form 6-K in
paper as permitted by Regulation S-T Rule 101(b)(1): _____

         Indicate by check mark if the registrant is submitting the Form 6-K in
paper as permitted by Regulation S-T Rule 101(b)(7): _____

         Indicate by check mark whether by furnishing the information contained
in this Form, the registrant is also thereby furnishing the information to the
Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

                                Yes       No  X
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       If "Yes", is marked, indicate below the file number assigned to the
              registrant in connection with Rule 12g3-2(b): 82- .





INDEX
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Exhibit 99.1   Press Release, dated August 10, 2005, in which Mittal Steel
               Company N.V. releases its second quarter and half year results
               for 2005.

Exhibit 99.2   Appendices to Press Release, dated August 10, 2005, in which
               Mittal Steel Company N.V. releases its second quarter and half
               year results for 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, thereunto duly authorized.

                                           MITTAL STEEL COMPANY N.V.


Date: August 10, 2005                   By:    /s/ Henk Scheffer        
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                                        Name:  Henk Scheffer
                                        Title: Company Secretary    




                                  EXHIBIT INDEX
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99.1 Press Release, dated August 10, 2005, in which Mittal Steel Company N.V.
     releases its second quarter and half year results for 2005.


99.2 Appendices to Press Release, dated August 10, 2005, in which Mittal Steel
     Company N.V. releases its second quarter and half year results for 2005.