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

William Job

Bourdon

Ave Ninchi

Signora Orragi

Renzo Palmer

Monk

Peter Bayliss

Edmond Rosier

Francesco Mulè

Policeman at Trevi Fountain

Rosemary Dexter

Daniela

Raoul Delfosse

Louis Le Buc

James Mishler

Jesse Hardee

Jean Louis

Driot

Jean Hébey

Man in charge of sleeping cars

Jacques Stany

Georges - the family chauffeur

Paule Albert

Sophie

Calisto Calisti

Police Inspector at Rome Station (uncredited)

Andrea Esterhazy

de Villemont Party Guest (uncredited)