| Actor | Alberto Sordi (as Nando Mericoni), Giulio Calì (as Mario Mericoni), Archibald L. Lyall (as Ambasciatore Americano), Rocco D'Assunta (as commissario), Charles Fawcett (as signor Brooks), Galeazzo Benti (as Fred Buonanotte) |
| Actress | Maria Pia Casilio (as Elvira), Anita Durante (as Margherita Anigretti), Ilse Petersen (as Molly Brooks), Ursula Andress (as Astrid Sjostrom) |
| Director | Steno |
| Music | Angelo Francesco Lavagnino |
| Writer | Sandro Continenza, Lucio Fulci, Ettore Scola, Alberto Sordi, Steno |
| Links | https://it.wikipedia.org/wiki/Un_americano_a_Roma |
