George Peppard
Reno Davis
Inger Stevens
Anne de Villemont
Orson Welles
Leschenhaut
Perrette Pradier
Jeanne-Marie
Keith Michell
Morillon
Geneviève Cluny
Veronique
Maxine Audley
Mathilde Rosier
Ralph Michael
Claude de Gonde
Barnaby Shaw
Paul
Jacques Roux
Maguy
Patience Collier
Goonelle
W
William Job
Bourdon
Ave Ninchi
Signora Orragi
Renzo Palmer
Monk
P
Peter Bayliss
Edmond Rosier
Francesco Mulè
Policeman at Trevi Fountain
Rosemary Dexter
Daniela
Raoul Delfosse
Louis Le Buc
J
James Mishler
Jesse Hardee
Jean Louis
Driot
Jean Hébey
Man in charge of sleeping cars
Jacques Stany
Georges - the family chauffeur
P
Paule Albert
Sophie
Calisto Calisti
Police Inspector at Rome Station (uncredited)
A
Andrea Esterhazy
de Villemont Party Guest (uncredited)