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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

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): May 11, 2004

MYLAN LABORATORIES INC.

1500 Corporate Drive
Canonsburg, PA 15317
(Address of principal executive offices)

(724) 514-1800
(Registrant’s telephone number, including area code)

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Item 7. Financial Statements and Exhibits.

(c) Exhibits.

Item 12. Results of Operations and Financial Condition.

     On May 11, 2004, Mylan Laboratories Inc., a Pennsylvania corporation, issued a press release reporting its financial results for the year and quarter ended March 31, 2004. A copy of such press release is attached hereto as Exhibit 99.1.

     The information in this report (including the exhibit) shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

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.

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EXHIBIT INDEX