UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549





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FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934





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Dated August 7, 2006

Commission File Number: 001-14666

MITTAL STEEL COMPANY N.V.

(Translation of registrants name into English)

15th Floor, Hofplein 20

3032 AC Rotterdam

The Netherlands

(Address of principal executive offices)

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

Form 20-FxForm 40-Fo

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

YesoNox

If Yes marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82-





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On August 7, 2006, Mittal Steel Company N.V. issued the transcripts attached hereto as Exhibit 99.1 and Exhibit 99.2.

Exhibit List





|             |  |                                                                                                                                                                                                                                                           |  | 
|------------ |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | 
|Exhibit No.  |  | Description                                                                                                                                                                                                                                               |  | 
|Exhibit 99.1 |  | Transcript of press presentation dated August 2, 2006 concerning first half results for 2006.                                                                                                                                                             |  | 
|Exhibit 99.2 |  | Transcript of press presentation dated August 4, 2006 announcing new appointments to the position of Chief Executive Officer, the position of Chief Financial Officer, the Management Board and the Board of Directors for both Mittal Steel and Arcelor. |  | 













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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.

Date: August 7, 2006



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| | --- | ------------------------
| | By: | /s/ Henk Scheffer       
| |     | Name: Henk Scheffer     
| |     | Title: Company Secretary







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Exhibit Index



|             |  |                                                                                                                                                                                                                                                           |  | 
|------------ |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | 
|Exhibit No.  |  | Description                                                                                                                                                                                                                                               |  | 
|Exhibit 99.1 |  | Transcript of press presentation dated August 2, 2006 concerning first half results for 2006.                                                                                                                                                             |  | 
|Exhibit 99.2 |  | Transcript of press presentation dated August 4, 2006 announcing new appointments to the position of Chief Executive Officer, the position of Chief Financial Officer, the Management Board and the Board of Directors for both Mittal Steel and Arcelor. |  | 









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