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