James Mason

Ulysses Diello

Danielle Darrieux

Condesa Anna Staviska

Michael Rennie

Colin Travers

Walter Hampden

Sir Frederic Taylor

Oskar Karlweis

L. C. Moyzisch

Herbert Berghof

Col. von Richter

John Wengraf

Count Franz Von Papen

Ben Astar

Siebert

Roger Plowden

Keith Macfadden

Diane Adrian

Singer on French Record (voice)

Patrick Whyte

Code Clerk

Hanna Axmann-Rezzori

David Bauer

Lawrence Dobkin

Martín Garralaga

Lumsden Hare

Richard Loo

Lester Matthews

Keith McConnell

Frank McLure

Charles Meakin

Alberto Morin

Nestor Paiva

Michael Pate

Konstantin Shayne

Ivan Triesault

Otto Waldis

Alfred Zeisler

Stuart Hall

British Military Attaché (uncredited)