Julius Caesar is a 1953 American film adaptation of the Shakespearean play, directed by Joseph L. Mankiewicz and produced by John Houseman for Metro-Goldwyn-Mayer. It stars Marlon Brando as Mark Antony, James Mason as Brutus, John Gielgud as Cassius, Louis Calhern as Caesar, Edmond O'Brien as Casca, Greer Garson as Calpurnia, and Deborah Kerr as Portia.