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)