- Rod Taylor
- Boysie Oakes
- Trevor Howard
- Colonel Mostyn
- Jill St. John
- Iris MacIntosh
- Wilfrid Hyde-White
- The Chief
- David Tomlinson
- Quadrant
- Akim Tamiroff
- Sheriek
- Eric Sykes
- Griffen
- Gabriella Licudi
- Corale
- John Le Mesurier
- Chekhov
- Derek Nimmo
- Fly
- Jeremy Lloyd
- Male Secretary
- Jennifer Jayne
- Janice Benedict
- Heller Toren
- Benedict's Assistant
- Betty McDowall
- Frances Anne Chandler
- Jo Rowbottom
- Betty
- Colin Gordon
- Vicar
- Louise Dunn
- Jessie
- Henri Cogan
- Yakov
- Daniel Emilfork
- Gregory
- Scot Finch
- Operations Officer
- Ronald Leigh-Hunt
- Mac
- Richard Wattis
- Flying Instructor
- David Langton
- Station Commander
- Tony Wright
- Flying Control
- Suzy Kendall
- Judith
- Andrew Andreas
- Party Waiter
- Jack Armstrong
- Second Victim
- Richard Atherton
- RAF Officer
- Alexandra Bastedo
- Radio Operator
- Hyma Beckley
- Airline Passenger
- Paul Beradi
- Party Guest
- Rodney Cardiff
- Operations Officer
- Pauline Chamberlain
- Woman at Dinner Table
- Vic Chapman
- Enemy Agent in Film
- Bill Cummings
- Third Victim
- Francis De Wolff
- Ambassador Dragov
- Michael Dempsey
- Waiter
- Ernest Fennemore
- Strangled Guard
- Hal Galili
- Tank Crewman
- Rex Garner
- Party Waiter
- Muriel Greenslade
- Party Guest
- Aidan Harrington
- Restaurant Patron
- Aiden Harrington
- Restaurant Patron
- Victor Harrington
- Restaurant Patron
- Walter Henry
- Airline Passenger
- Laurence Herder
- Gestapo Agent
- Bill Hibbert
- Guard with Boysie
- George Hilsdon
- Bert - Security Guard
- George Holdcroft
- Restaurant Patron
- Barbara Jefford
- Corale / French Desk Clerk (voice) (uncredited)
- Gerry Judge
- Waiter
- Pat Judge
- Restaurant Patron
- Juba Kennerley
- Party Guest
- Aileen Lewis
- Restaurant Patron
- Al Lewis
- Party Guest
- Brian Magill
- RAF Regiment Honour Guard
- Jack Mandeville
- Tailor's Assistant
- Ray Marioni
- Bartender
- Louis Matto
- Waiter
- Tony Mendleson
- Passerby / Commuter on Platform (uncredited)
- Richard Neller
- Airline Passenger
- Patrick O'Connell
- Radar Operator
- George Oliver
- Passport Officer
- Gerald Paris
- Party Guest
- Ken Parry
- Tailor
- Michael Peake
- Quadrant's Driver
- Fred Peck
- Airline Passenger
- Denise Perrier
- Hotel Receptionist
- Rhonda Ryan
- Boysie's Riding Companion
- Emile Stemmler
- Headwaiter
- Philip Stewart
- Party Guest
- Phillip Stewart
- Party Guest
- John Tatham
- Commuter on Platform
- James Ure
- Onlooker
- Ken Wayne
- Tank Crewman
- Fred Wood
- Commuter on Platform
