 | Bibi Andersson als Karin Ullman |
 | Robert Stack als David Frasier |
 | James Farentino als Bruno Cardini |
 | Annie Girardot als Liliana |
 | Didi Perego als Bruno's Girl Friend |
 | Mario Nascimbene als Prof Ferrara |
 | Francesco Mulè als Manzetti (as Francesco Mulé) |
 | Frank Sundström als Mr. Ullman |
 | Toivo Pawlo als Rushenov |
 | Beppe Wolgers als Fahlen |
 | Birgitta Valberg als Mrs. Ullman |
 | Cathy Riney als Cathy |
| Erika Rosell als Sissi |
 | Ted Gärdestad als Swedish Boy Playing Accordion (uncredited) |
| Kenneth Gärdestad als Swedish Guy Playing Guitar (uncredited) |
| Leonardo Bercovici | Director |
| Leonardo Bercovici | Writer |
| Leonardo Bercovici | Producer |
| Milton Shifman | Editor |
| Aurelio Crugnola | Art Direction |
| Alexander Golitzen | Art Direction |
| Franco Fumagalli | Set Decoration |
| John McCarthy Jr. | Set Decoration |
| Edith Head | Costume Design |
| Giuseppe Banchelli | Makeup Artist |
| Cesare Gambarelli | Makeup Artist |
| Larry Germain | Music Supervisor |
| Bud Westmore | Makeup Supervisor |
| Milton Feldman | Production Supervisor |
| Luciano Piperno | Unit Production Manager |
| Fred Wallach | Production Manager |
| Roberto Malenotti | Assistant Director |
| Waldon O. Watson | Sound |
| Luciano Welisch | Sound |
| Cesare Allione | Camera Operator |
| Marion Mertes | Script Supervisor |
| Hunt Downs | Unit Publicist |
| Sergio Mioni | Technical Advisor |
| John Williams | Original Music Composer |
| Stanley Wilson | Music Supervisor |
| Piero Portalupi | Director of Photography |
| Renzo Lucidi | Consulting Editor |
| Larry Germain | Hairstylist |
| Vasco Reggiani | Hairstylist |
| Italia Scandariato | Wardrobe Designer |
| Dede Allen | Production Consultant |
