UNITED STATES

FORM 6-K

Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16
of the Securities Exchange Act of 1934

July 28, 2005

1-15240
(Commission File Number)

JAMES HARDIE INDUSTRIES N.V.

Atrium, 8th floor
Strawinskylaan 3077
1077 ZX Amsterdam, 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-F þ Form 40-F o

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): Not Applicable

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): Not Applicable

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 o No þ

(If “Yes” is marked, indicate below the file number assigned to the registrant in connection with
Rule 12g3-2(b): Not Applicable

TABLE OF CONTENTS

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Safe Harbor Statement

The exhibit attached to this form 6-K contains forward-looking statements. We may from time to time make forward-looking statements in our periodic reports filed with or furnished to the United States Securities and Exchange Commission on Forms 20-F and 6-K, in our annual reports to shareholders, in offering circulars and prospectuses, in media releases and other written materials and in oral statements made by our officers, directors or employees to analysts, institutional investors, representatives of the media and others. Examples of such forward-looking statements include:

Words such as “believe,” “anticipate,” “plan,” “expect,” “intend,” “target,” “estimate,” “project,” “predict,” “forecast,” “guideline,” “should,” “aim” and similar expressions are intended to identify forward-looking statements but are not the exclusive means of identifying such statements.

Forward-looking statements involve inherent risks and uncertainties. We caution you that a number of important factors could cause actual results to differ materially from the plans, objectives, expectations, estimates and intentions expressed in such forward-looking statements. These factors, some of which are discussed under “Risk Factors” in our Form 20-F, include but are not limited to: all matters relating to or arising out of the prior manufacture of products that contained asbestos by current and former James Hardie Group subsidiaries; compliance with and changes in tax laws and treatments; competition and product pricing in the markets in which we operate; the consequences of product failures or defects; exposure to environmental, asbestos or other legal proceedings; general economic and market conditions; the supply and cost of raw materials; the success of our research and development efforts; our reliance on a small number of product distributors; compliance with and changes in environmental and health and safety laws; risks of conducting business internationally; compliance with and changes in laws and regulations; foreign exchange risks; the successful implementation of new software systems; and the successful transition of our new senior management. We caution you that the foregoing list of factors is not exclusive and that other risks and uncertainties may cause actual results to differ materially from those in forward-looking statements. Forward-looking statements speak only as of the date they are made.

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EXHIBIT INDEX

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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.

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EXHIBIT INDEX

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