• 
  James Mason

  Peter Vadassy
• 
  Herbert Lom

  Andre Roux
• 
  Joseph Almas

  Albert, the waiter (as Josef Almas)
• 
  Valentine Dyall

  Warren Skelton
• 
  Clare Hamilton

  Mary Skelton
• 
  Laurence Hanray

  Police Commissioner
• 
  Patricia Hayes

  Woman
• 
  Raymond Lovell

  Robert Duclos

• 
  Lucie Mannheim

  Mme Suzanne Koch
• 
  Patricia Medina

  Odette Roux
• 
  Martin Miller

  Walter Vogel
• 
  Julien Mitchell

  Michel Beghin, intelligence chief
• 
  Anthony Shaw

  Major Anthony Chandon-Hartley
• 
  Frederick Valk

  Emil Schimler, alias Paul Heimberger
• 
  David Ward

  Henri Asticot