Michael Caine as Harry Palmer

Paul Hubschmid as Johnnie Vulkan

Oskar Homolka as Colonel Stok

Eva Renzi as Samantha Steel

Guy Doleman as Ross

Hugh Burden as Hallam

Heinz Schubert as Aaron Levine

Wolfgang Völz as Werner

Thomas Holtzmann as Reinhardt

Günter Meisner as Kreutzman

Herbert Fux as Artur

Rainer Brandt as Benjamin

Rachel Gurney as Mrs. Ross

John Abineri as Rukel

David Glover as Chico

Sarah Brackett as Babcock

Charlotte Brummerhoff as Black Widow

Ira Hagen as Monica

Erhart Stettner as Old Man

Freda Bamford as Alice (uncredited)

Pauline Chamberlain as Lady on the London Bus (uncredited)

Patrick Halpin as Commuter (uncredited)

Ursula Heyer as Bar Girl (uncredited)

Marthe Keller as Brigit (uncredited)

Edward Meeks as East German Guard (uncredited)