Valentina Cortese character Maria Brentano / Brent / Lena Collins
Serge Reggiani character Louis Balan
Audrey Hepburn character Nora Brentano
Megs Jenkins character Penny
Irene Worth character Miss Jackson
Reginald Tate character Inspector Eliot
Charles Goldner character Anselmo
Angela Fouldes character Nora Brentano as a child
Simone Silva character Undetermined (Minor Role - Paris Sequence) (uncredited)
Norman Williams character Sergeant Newcome
Michael Shepley character Manager of the British Pavilion
Athene Seyler character Mrs. Reginald Kellick
Sydney Tafler character Syd Burnett
Geoffrey Hibbert character Steenie
John Ruddock character Daly
Michael Allan character Rodd
John Field character Fedor Luki
Hugo Schuster character General Galbern
Lionel Harris character Frack
Rollo Gamble character Bentley
John Penrose character Bill
John Chandos character John
Michael Ripper character Charlie
Louis Mansi character Member of Paris Committee
John Gabriel character Member of Paris Committee
Olga Landiak character Member of Paris Committee
Frederick Schiller character Galbern's Bodyguard
Phaedros Antonio character Galbern's Bodyguard
Gaston Richer character Queval
Derek Elphinstone character Plain Clothes Man
Edward Evans character Plain Clothes Man
Jack McNaughton character Postman
Ingeborg von Kusserow character Shoe Shop Girl
Bob Monkhouse character Hairdresser
Helen Ford character Scarf Woman
Ann Lancaster character Manicurist
Grace Draper character Floozie
Bertram Shuttleworth character Little Man
Pamela Harrington character Waitress
John Allen character The Valet
Bay White character Nursing Sister
Joe Linnane character Irish Police Inspector
Sam Kydd character Irish Police Sergeant
