| Person | Type | Job | Role(s) |
|---|---|---|---|
 Dale Eunson | Crew | Writing | Screenplay |
 Enzo Barboni | Crew | Camera | Director of Photography |
Frederick Kohner | Crew | Writing | Characters |
Jerry Bresler | Crew | Production | Producer |
 John Williams | Crew | Sound | Original Music Composer |
Katherine Albert | Crew | Writing | Screenplay |
 Paul Wendkos | Crew | Directing | Director |
Robert J. Bronner | Crew | Camera | Director of Photography |
Robert Peterson | Crew | Art | Art Direction |
Ruth Brooks Flippen | Crew | Writing | Screenplay, Story |
William A. Lyon | Crew | Editing | Editor |
Antonio Sarzi-Braga | Crew | Art | Art Direction |
 Cesare Danova | Cast | Actor | Paolo Cellini |
 Charles Borromel | Cast | Actor | Whitefaced Poet (uncredited) |
 Cindy Carol | Cast | Actress | Frances "Gidget" Lawrence |
 Claudio Gora | Cast | Actor | Alberto |
 Danielle De Metz | Cast | Actress | Daniela |
 Don Porter | Cast | Actor | Russell Lawrence |
 Eddie Foy Jr. | Cast | Actor | Man at Beach Trying to Use Telephone |
 Eddra Gale | Cast | Actress | Fat Party Guest |
 Evi Marandi | Cast | Actress | Receptionist (uncredited) |
 James Darren | Cast | Actor | Moondoggie (Jeffrey Matthews) |
 Jeff Donnell | Cast | Actress | Mrs. Lawrence |
 Jessie Royce Landis | Cast | Actress | Albertina Blythe |
Jim Dolen | Cast | Nelson (uncredited) | |
 Joby Baker | Cast | Actor | Judge |
 John Stacy | Cast | Actor | Drunken Butler (uncredited) |
 José Canalejas | Cast | Actor | Pinchman (uncredited) |
Leonardo Botta | Cast | Italian Boy (uncredited) | |
 Lisa Gastoni | Cast | Actress | Signora Cellini |
 Luigi Bonos | Cast | Actor | Museum Official (uncredited) |
 Mathilda Calnan | Cast | Actress | Old Party Guest (uncredited) |
 Milly | Cast | Actress | Henrietta (uncredited) |
 Mimo Billi | Cast | Fontana Doorman (uncredited) | |
 Noreen Corcoran | Cast | Actress | Lucy McDougall |
 Rod Dana | Cast | Actor | U.S. Embassy Marine (uncredited) |
Trudi Ames | Cast | Libby Bennett | |
Joe Kamel | Cast | Actor | Italian Boy (uncredited) |
 Peter Brooks | Cast | Clay Anderson | |
| Person | Type | Job | Role(s) |
