| Marlon Brando | Mark Antony | |
| John Gielgud | Cassius | |
| Edmond O'Brien | Casca | |
| Deborah Kerr | Portia | |
| Michael Pate | Flavius | |
| Alan Napier | Cicero |
| James Mason | Brutus | |
| Louis Calhern | Julius Caesar | |
| Greer Garson | Calpurnia | |
| George Macready | Marullus | |
| Richard Hale | Soothsayer | |
| John Hoyt | Decius Brutus |