UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON D.C. 20549

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): April 28, 2004

MILLIPORE CORPORATION

(Exact name of Registrant as specified in charter)

MASSACHUSETTS (State or other jurisdiction of incorporation) 001-09781 (0-1052) (Commission File Number) 04-2170233 (I.R.S. Employer Identification No.)

290 Concord Road, Billerica, Massachusetts 01821

(Address of Principal Executive Offices) (Zip Code)

Registrant’s Telephone number, including area code: (978) 715-4321

Item 5.    Other Events.

On April 28, 2004, Millipore Corporation issued a press release announcing that Francis J. Lunger has decided to step down as President and CEO of Millipore. The press release is attached as Exhibit 99.1 to this Current Report on Form 8-K.

Item 7.    Financial Statements, Pro Forma Financial Information and Exhibits.

(c) Exhibits.

Exhibit Number	Title
99.1	Press Release issued April 28, 2004.

2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

MILLIPORE CORPORATION

/s/    Jeffrey Rudin                                 

Jeffrey Rudin

Vice President and General Counsel

Date: April 28, 2004

3

EXHIBIT INDEX

Exhibit Number	Description
99.1	Press Release issued April 28, 2004.

4