David Knight
Ted Hutchens
Odile Versois
Anna Szobek
Theodore Bikel
Joseph
David Kossoff
Geza Szobek
Joseph Tomelty
Moffatt
Paul Carpenter
Gregg Pearson
Peter Illing
Dr. Weissbrod
John McLaren
Col. Margetson
Bernard Rebel
Stefan
Jill Adams
Judy (uncredited)
Robin Bailey
Thomas Cook cashier (uncredited)
Dora Bryan
Switchboard Operator (uncredited)
Peter Dyneley
Regan (uncredited)
Dwight D. Eisenhower
Himself, in photo (uncredited)
Percy Herbert
Richards (uncredited)
Sam Kydd
Driver, Embassy car JAK711 (uncredited)
Victor Maddern
Sailor (uncredited)
Betty Marsden
Mrs. Forrester (uncredited)
Aubrey Mather
Waiter (uncredited)
Joan Sims
Telephone Operator, American Embassy (uncredited)
Russell Waters
Counterman (uncredited)