While the Civil War rages on between the Union and the Confederacy, three men – a quiet loner, a ruthless hitman, and a Mexican bandit – comb the American Southwest in search of a strongbox containing $200,000 in stolen gold.
| Directing | Sergio Leone | Director |
| Production | Alberto Grimaldi | Producer |
| Sound | Ennio Morricone | Original Music Composer |
| Camera | Tonino Delli Colli | Director of Photography |
| Editing | Eugenio Alabiso | Editor |
| Editing | Nino Baragli | Editor |
| Costume & Make-Up | Carlo Simi | Costume Design |
| Writing | Luciano Vincenzoni | Screenplay |
| Writing | Sergio Leone | Screenplay |
| Writing | Agenore Incrocci | Screenplay |
| Writing | Furio Scarpelli | Screenplay |
| Writing | Luciano Vincenzoni | Story |
| Writing | Sergio Leone | Story |
| Costume & Make-Up | Rino Carboni | Makeup Artist |
| Art | Carlo Leva | Assistant Art Director |
| Art | Carlo Simi | Production Design |
| Crew | Eros Bacciucchi | Special Effects |
| Crew | Román Ariznavarreta | Stunts |
| Crew | Giovanni Corridori | Special Effects |
| Production | Aldo Pomilia | Production Supervisor |
| Production | José Antonio Pérez Giner | Production Manager |
| Production | Gray Frederickson | Production Manager |
| Directing | Fabrizio Gianni | Assistant Director |
| Crew | John Landis | Stunts |
| Crew | Benito Stefanelli | Stunts |
| Crew | Fabio Testi | Stunts |
| Camera | Franco Di Giacomo | Camera Operator |
| Camera | Sergio Salvati | First Assistant Camera |
| Camera | Angelo Novi | Still Photographer |
| Crew | Sergio Donati | Additional Dialogue |
| Sound | Bruno Nicolai | Music Director |
| Crew | Luigi Ciavarro | Stunts |
| Crew | Romano Puppo | Stunts |
| Costume & Make-Up | Rino Todero | Hairdresser |
| Production | Fernando Cinquini | Production Manager |
| Directing | Giancarlo Santi | Assistant Director |
| Sound | Aldo Ciorba | Foley Artist |
| Sound | Vittorio De Sisti | Sound Engineer |
| Sound | Elio Pacella | Sound Engineer |
| Sound | Fausto Ancillai | Sound Mixer |
| Crew | Antonio Baquero | Special Effects |
| Crew | Valentino Pelizzi | Stunts |
| Crew | Benito Stefanelli | Stunt Coordinator |
| Camera | Domenico Parrello | Grip |
| Editing | Nazzareno Neri | Colorist |
| Sound | Cantori Moderni Di Alessandroni | Musician |
| Sound | Franco Cosacchi | Musician |
| Sound | Nino Dei | Musician |
| Sound | Edda Dell'Orso | Musician |
| Sound | Enzo Gioieni | Musician |
| Sound | Gianna Spagnolo | Musician |
| Sound | Alessandro Alessandroni | Music Arranger |
| Sound | Alessandro Alessandroni | Musician |
| Sound | Bruno Battisti D'Amario | Musician |
| Sound | Italo Cammarota | Musician |
| Sound | Francesco Catania | Musician |
| Sound | Franco De Gemini | Musician |
| Sound | E. Wolf Ferrari | Musician |
| Sound | Michele Lacerenza | Musician |
| Sound | John O'Neill | Musician |
| Sound | Vincenzo Restuccia | Musician |
| Sound | Nicola Samale | Musician |
| Directing | Serena Canevari | Script Supervisor |
| Production | Carlo Bartolini | Production Assistant |
| Production | Luigi Corbo | Production Secretary |
| Art | Igino Lardani | Title Designer |
| Production | Antonio Palombi | Production Secretary |
| Production | Federico Tofi | Production Assistant |
| Writing | Mickey Knox | Dialogue |
