Oliver Reed
Ivan Dragomiloff
Diana Rigg
Sonya Winter
Telly Savalas
Lord Bostwick
Curd Jürgens
General von Pinck
Philippe Noiret
Monsieur Lucoville
Warren Mitchell
Herr Weiss
Beryl Reid
Madame Otero
Clive Revill
Cesare Spado
Kenneth Griffith
Monsieur Popescu
Vernon Dobtcheff
Baron Muntzof
Annabella Incontrera
Eleanora Spado
Jess Conrad
Angelo
George Coulouris
Swiss Peasant
Ralph Michael
Editor
Katherine Kath
Mme. Lucoville
Eugene Deckers
'La Belle Amie' desk clerk
Olaf Pooley
Swiss Cashier
George Murcell
Zeppelin pilot
Michael Wolf
Zeppelin officer
Gordon Sterne
Corporal
Peter Bowles
Jealous lover at 'La Belle Amie' (uncredited)
William Kendall
M. Marivaux at 'La Belle Amie'
Jeremy Lloyd
English Officer
Roger Delgado
Bureau Member (uncredited)
Maurice Browning
Bureau Member
Clive Cazes
Bureau Member
Milton Reid
Circus victim Leonardi
Frank Thornton
Elevator victim (uncredited)
Nita Lorraine
'La Belle Amie' Girl
Michael Mellinger
Venetian Police Officer (uncredited)
Philip Madoc
German Officer
Kevin Stoney
Blind Man
Lockwood West
Hatter
Rosalind Elliot
Blind hatmaker (Uncredited)
John Abineri
Police Inspector (uncredited)
Anthony Dawes
Assistant Editor (uncredited)
Harry Fielder
Soldier (uncredited)
Michael Gover
Venice Hotel Manager (uncredited)
Peter Graves
Dragomiloff's Butler (uncredited)
John Hallam
Bureau Member (uncredited)
John G. Heller
von Pinck's Aide (uncredited)
Alastair Hunter
Exp!oding Casket Victim (uncredited)