 | Sophia Loren als Lucilla |
 | Stephen Boyd als Livius |
 | Alec Guinness als Marcus Aurelius |
 | James Mason als Timonides |
 | Christopher Plummer als Commodus |
 | Anthony Quayle als Verulus |
 | John Ireland als Ballomar |
 | Omar Sharif als Sohamus |
 | Mel Ferrer als Cleander |
 | Eric Porter als Julianus |
 | Finlay Currie als Senator |
 | Andrew Keir als Polybius |
 | Douglas Wilmer als Niger |
 | George Murcell als Victorinus |
 | Norman Wooland als Virgilianus |
 | Michael Gwynn als Cornelius |
 | Virgílio Teixeira als Marcellus |
 | Peter Damon als Claudius |
 | Rafael Luis Calvo als Lentulus |
 | Lena von Martens als Helva |
 | Roland Carey als Barbarian (uncredited) |
| Margaret Fuller als Part of Court (uncredited) |
| Mario Ghignone als Gladiators Trainer (uncredited) |
 | Gabriella Licudi als Tauna (uncredited) |
| Jeffrey O'Kelly als Brother of Livius (uncredited) |
 | Robert Rietti als Opening Narrator (voice / uncredited) |
 | Guy Rolfe als Marius (uncredited) |
| José Terrón als Soldier on Horse (uncredited) |
 | Friedrich von Ledebur als Barbarian (uncredited) |
| Patricia Wright als Roman Citizen, Slave Woman (uncredited) |
| Anthony Mann | Director |
| Edward Gibbon | Author |
| Samuel Bronston | Producer |
| Ben Barzman | Screenplay |
| John Moore | Production Design |
| Veniero Colasanti | Production Design |
| Philip Yordan | Screenplay |
| Jaime Prades | Associate Producer |
| Robert Krasker | Director of Photography |
| Basilio Franchina | Screenplay |
| Maude Spector | Casting |
| John Moore | Set Decoration |
| Robert Lawrence | Editor |
| Veniero Colasanti | Set Decoration |
| Dimitri Tiomkin | Original Music Composer |
| Veniero Colasanti | Costume Design |
| John Moore | Costume Design |
| José María Ochoa | Assistant Director |
| C.O. Erickson | Production Manager |
| George Korngold | Music Editor |
| Bruno Pasqualini | Electrician |
| John Harris | Camera Operator |
| David Hildyard | Sound Mixer |
| Gordon K. McCallum | Sound Re-Recording Mixer |
| Yakima Canutt | Second Unit Director |
| George Tyne | Dialogue Coach |
| Elaine Schreyeck | Continuity |
| Will Durant | Technical Advisor |
| José López Rodero | Assistant Director |
| Magdalena Paradell | Assistant Editor |
| Carl Gibson | Technical Supervisor |
| Grazia De Rossi | Hairdresser |
| Stanley Detlie | Property Master |
| Alex Weldon | Special Effects |
| Gloria Mussetta | Wardrobe Master |
| Michał Waszyński | Associate Producer |
| Milton C. Burrow | Sound Effects Editor |
| Cecilio Paniagua | Second Unit Cinematographer |
| Maciek Piotrowski | Title Illustration |
| Mario Van Riel | Makeup Artist |
| Yakima Canutt | Stunt Coordinator |
| Samuel Bronston | Presenter |
| Andrew Marton | Second Unit Director |
| Mauro Sacripanti | Second Assistant Director |
| Julio Sempere | Second Second Assistant Director |
| Dimitri Tiomkin | Conductor |
| Cecil Bolton | Orchestrator |
| Frank Comstock | Orchestrator |
| Robert Docker | Orchestrator |
| George Parrish | Orchestrator |
| David Tamkin | Orchestrator |
| Herbert Taylor | Orchestrator |
