JOINT FILING AGREEMENT

EXHIBIT 1

JOINT FILING AGREEMENT

     The undersigned hereby agree that the Statement on Schedule 13D, dated December 23, 2004, with respect to the Class A Common Shares of Mittal Steel Company N.V. is, and any amendments thereto executed by each of us shall be, filed on behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, and that this Agreement shall be included as an Exhibit to the Schedule 13D and each such amendment. Each of the undersigned agrees to be responsible for the timely filing of the Schedule 13D and any amendments thereto, and for the completeness and accuracy of the information concerning itself contained therein. This Agreement may be executed in any number of counterparts, all of which taken together shall constitute one and the same instrument.

     IN WITNESS WHEREOF, the undersigned have executed this Agreement as of the 23^rd day of December, 2004.

	By:	/s/ Xxxxxxx Xxxxxx
		Xxxxxxx X. Xxxxxx
	By:	/s/ Xxxx Xxxxxx
		Xxxx Xxxxxx
	ISPAT INTERNATIONAL INVESTMENTS, S.L., SOCIEDAD UNIPERSONAL
	By:	/s/ Xxxxxx Xxxxxxxxxx
		Name: Xxxxxx Xxxxxxxxxx
		Title: Director
	By:	/s/ Xxxxxxx Xxxxx
		Name: Xxxxxxx Xxxxx
		Title: Director

	MITTAL STEEL S.À X.X.
	By:	/s/ Xxxxx Xxxxxx
		Name: Xxxxx Xxxxxx
		Title: Director
	By:	/s/ Pierre Van Halteren & /s/ Xxxxxx Xxxx
		Name: Universal Management Services S.à.x.x.
		Title: Director