| Person | Type | Job | Role(s) |
|---|---|---|---|
 Alexander Golitzen | Crew | Art | Art Direction |
Aurelio Crugnola | Crew | Art | Art Direction |
 Bud Westmore | Crew | Costume & Make-Up | Makeup Artist |
 Edith Head | Crew | Costume & Make-Up | Costume Design |
Ferdinando Ruffo | Crew | Art | Set Decoration |
 Francis Lai | Crew | Sound | Original Music Composer |
Frank Arrigo | Crew | Art | Art Direction |
 Harriet Frank Jr. | Crew | Writing | Screenplay |
 Irving Ravetch | Crew | Writing | Screenplay |
J. Terry Williams | Crew | Editing | Editor |
 John Guillermin | Crew | Directing | Director |
John McCarthy Jr. | Crew | Art | Set Decoration |
John Merrick | Crew | Production | Casting |
Larry Germain | Crew | Costume & Make-Up | Hairstylist |
Piero Portalupi | Crew | Crew | Cinematography |
Stanley Ellin | Crew | Writing | Novel |
Cesare Gambarelli | Crew | Costume & Make-Up | Makeup Artist |
Giorgio Sciommer | Crew | Costume & Make-Up | Hairstylist |
Richard Berg | Crew | Production | Producer |
Waldon O. Watson | Crew | Sound | Sound |
Giuseppe Banchelli | Crew | Costume & Make-Up | Makeup Artist |
Kurt Doubrowsky | Crew | Sound | Sound |
Vasco Reggiani | Crew | Costume & Make-Up | Hairstylist |
Paola Roli | Crew | Production | Casting |
Cesare Allione | Crew | Camera | Camera Operator |
 Sheryl Deauville | Crew | Costume & Make-Up | Assistant Costume Designer |
Alberto Pizzi | Crew | Crew | Cinematography |
 Andrea Esterhazy | Cast | Actor | de Villemont Party Guest (uncredited) |
 Ave Ninchi | Cast | Actress | Signora Orragi |
 Barnaby Shaw | Cast | Actor | Paul |
 Calisto Calisti | Cast | Actor | Police Inspector at Rome Station (uncredited) |
 Francesco Mulè | Cast | Actor | Policeman at Trevi Fountain |
 Geneviève Cluny | Cast | Actress | Veronique |
 George Peppard | Cast | Actor | Reno Davis |
 Inger Stevens | Cast | Actress | Anne de Villemont |
 Jacques Roux | Cast | Actor | Maguy |
James Mishler | Cast | Jesse Hardee | |
 Jean Hébey | Cast | Actor | Man in charge of sleeping cars |
 Jean Louis | Cast | Actor | Driot |
 Keith Michell | Cast | Actor | Morillon |
 Maxine Audley | Cast | Actress | Mathilde Rosier |
 Orson Welles | Cast | Actor | Leschenhaut |
 Patience Collier | Cast | Actress | Goonelle |
Paule Albert | Cast | Sophie | |
 Perrette Pradier | Cast | Actress | Jeanne-Marie |
 Peter Bayliss | Cast | Actor | Edmond Rosier |
 Ralph Michael | Cast | Actor | Claude de Gonde |
 Raoul Delfosse | Cast | Actor | Louis Le Buc |
 Renzo Palmer | Cast | Actor | Monk |
 Rosemary Dexter | Cast | Actress | Daniela |
William Job | Cast | Bourdon | |
 Jacques Stany | Cast | Actor | Georges - the family chauffeur |
| Person | Type | Job | Role(s) |
