Richard Burton as Alec Leamas

Claire Bloom as Nan Perry

Oskar Werner as Fiedler

Sam Wanamaker as Peters

George Voskovec as East German Defense Attorney

Rupert Davies as George Smiley

Cyril Cusack as Control

Peter van Eyck as Hans-Dieter Mundt

Michael Hordern as Ashe

Robert Hardy as Dick Carlton

Bernard Lee as Patmore

Beatrix Lehmann as Tribunal President

Esmond Knight as Old Judge

Niall MacGinnis as German Checkpoint Guard

Scot Finch as German Guide

Anne Blake as Miss Crail

George Mikell as German Checkpoint Guard

Richard Marner as Vopo Captain

Warren Mitchell as Mr. Zanfrello

Steve Plytas as East German Judge

Tom Stern as CIA Agent

Graham Armitage as Pawson (uncredited)

David Bauer as Young Judge (uncredited)

Richard Caldicot as Mr. Pitt - Employment Officer (uncredited)

Marianne Deeming as Frau Floerdke (uncredited)

Walter Gotell as Holten (uncredited)

Edward Harvey as Man in Shop (uncredited)

Geoffrey Keen as British Sentry (Sgt.) at Checkpoint Charlie (uncredited)

Katherine Keeton as Pussywillow Club Stripper (uncredited)

Philip Madoc as Young German Officer (uncredited)

Henk Molenberg as Dutch Customs Officer (uncredited)

Nancy Nevinson as Mrs. Zanfrello - Grocery Customer (uncredited)

John Quentin as Pawson (uncredited)

Michael Ripper as Lofthouse - Library Assistant (uncredited)

Michael Rittermann as Security Officer (uncredited)

Richard Shaw as Guard (uncredited)

Terry Yorke as Karl Riemeck (uncredited)