The Phantom of the Opera is a 1925 American Universal Classic Monster silent horror film adaptation of Gaston Leroux's novel of the same name directed by Rupert Julian and starring Lon Chaney in the title role of the deformed Phantom who haunts the Paris Opera House, causing murder and mayhem in an attempt to make the woman he loves a star. The film remains most famous for Chaney's ghastly, self-devised make-up, which was kept a studio secret until the film's premiere. The picture also features Mary Philbin, Norman Kerry, Arthur Edmund Carewe, Gibson Gowland, John St. Polis and Snitz Edwards. The last surviving cast member was Carla Laemmle (1909–2014), niece of producer Carl Laemmle, who played a small role as a "prima ballerina" in the film when she was about 15 years old. The first cut of the film was previewed in Los Angeles on January 26, 1925. The film was released on September 6, 1925, premiering at the Astor Theatre in New York. Vaudeville stars Broderick & Felsen created a live prologue for the film's Broadway presentation at the B.S. Moss Colony Theater beginning on November 28, 1925. The film's final budget was $632,357.

In 1953, the film entered the public domain in the United States because the film's distributor Universal Pictures did not renew its copyright registration in the 28th year after publication.