Westinghouse Works, 1904 is a collection of American short silent films, each averaging about three minutes in length. The films were taken from April 18, 1904, to May 16, 1904, in Pittsburgh, Pennsylvania, and document various Westinghouse manufacturing plants. They were made by G. W. "Billy" Bitzer of the American Mutoscope and Biograph Company, were shown at the Westinghouse Auditorium at the 1904 St. Louis World's Fair, and may have been made for that purpose. At least 29 films were produced and 21 remain in the collection which is now a part of the National Film Registry of the Library of Congress.