| Person | Type | Job | Role(s) |
|---|---|---|---|
 Barbara Ritchie | Crew | Costume & Make-Up | Hairstylist |
Barrie Melrose | Crew | Production | Production Manager |
 Basil Dearden | Crew | Directing | Director |
Beatrice Dawson | Crew | Costume & Make-Up | Costume Design |
Charles Orme | Crew | Production | Associate Producer |
Dudley Messenger | Crew | Sound | Sound Recordist |
Frank White | Crew | Art | Art Direction |
 Geoffrey Unsworth | Crew | Camera | Director of Photography |
Harry Frampton | Crew | Costume & Make-Up | Makeup Artist |
 Jack London | Crew | Writing | Novel |
John Hilling | Crew | Costume & Make-Up | Wardrobe Supervisor |
John Peverall | Crew | Directing | Assistant Director |
John Poyner | Crew | Sound | Sound Editor |
Ken Barker | Crew | Sound | Sound Recordist |
 Michael Relph | Crew | Art | Production Design, Producer, Writer |
 Peter MacDonald | Crew | Camera | Camera Operator |
Robert L. Fish | Crew | Writing | Novel |
 Ron Grainer | Crew | Sound | Music |
Rosemary Burrows | Crew | Costume & Make-Up | Wardrobe Supervisor |
Roy Forge Smith | Crew | Art | Art Direction |
Teddy Darvas | Crew | Editing | Editor |
 Vic Armstrong | Crew | Crew | Stunts |
Weston Drury Jr. | Crew | Production | Casting |
John Dennis | Crew | Sound | Sound Recordist |
George Courtney Ward | Crew | Camera | Still Photographer |
Susan Dyson | Crew | Directing | Continuity |
 Alastair Hunter | Cast | Actor | Exp!oding Casket Victim (uncredited) |
Annabella Incontrera | Cast | Actress | Eleanora Spado |
 Anthony Dawes | Cast | Actor | Assistant Editor (uncredited) |
 Beryl Reid | Cast | Actress | Madame Otero |
Clive Cazes | Cast | Actor | Bureau Member |
 Clive Revill | Cast | Actor | Cesare Spado |
 Curd Jürgens | Cast | Actor | General von Pinck |
 Diana Rigg | Cast | Actress | Sonya Winter |
 Frank Thornton | Cast | Actor | Elevator victim (uncredited) |
 George Coulouris | Cast | Actor | Swiss Peasant |
 George Murcell | Cast | Actor | Zeppelin pilot |
 Gordon Sterne | Cast | Actor | Corporal |
 Harry Fielder | Cast | Actor | Soldier (uncredited) |
 Jeremy Lloyd | Cast | Actor | English Officer |
 Jess Conrad | Cast | Actor | Angelo |
 John Abineri | Cast | Actor | Police Inspector (uncredited) |
 John G. Heller | Cast | Actor | von Pinck's Aide (uncredited) |
 John Hallam | Cast | Actor | Bureau Member (uncredited) |
 Katherine Kath | Cast | Actress | Mme. Lucoville |
 Kenneth Griffith | Cast | Actor | Monsieur Popescu |
 Kevin Stoney | Cast | Actor | Blind Man |
 Lockwood West | Cast | Actor | Hatter |
Maurice Browning | Cast | Actor | Bureau Member |
 Michael Gover | Cast | Actor | Venice Hotel Manager (uncredited) |
 Michael Mellinger | Cast | Actor | Venetian Police Officer (uncredited) |
Michael Wolf | Cast | Actor | Zeppelin officer |
 Milton Reid | Cast | Actor | Circus victim Leonardi |
 Nita Lorraine | Cast | Actress | 'La Belle Amie' Girl |
 Olaf Pooley | Cast | Actor | Swiss Cashier |
 Oliver Reed | Cast | Actor | Ivan Dragomiloff |
 Peter Bowles | Cast | Actor | Jealous lover at 'La Belle Amie' (uncredited) |
 Peter Graves | Cast | Actor | Dragomiloff's Butler (uncredited) |
 Philip Madoc | Cast | Actor | German Officer |
 Philippe Noiret | Cast | Actor | Monsieur Lucoville |
 Ralph Michael | Cast | Actor | Editor |
 Roger Delgado | Cast | Actor | Bureau Member (uncredited) |
Rosalind Elliot | Cast | Actress | Blind hatmaker (Uncredited) |
 Telly Savalas | Cast | Actor | Lord Bostwick |
 Vernon Dobtcheff | Cast | Actor | Baron Muntzof |
 Warren Mitchell | Cast | Actor | Herr Weiss |
William Kendall | Cast | Actor | M. Marivaux at 'La Belle Amie' |
 Eugene Deckers | Cast | Actor | 'La Belle Amie' desk clerk |
| Person | Type | Job | Role(s) |
