 Richard BurtonAlec Leamas | Alec Leamas |
 Claire BloomNancy 'Nan' Perry | Nancy 'Nan' Perry |
 Oskar WernerFiedler | Fiedler |
 Sam WanamakerPeters | Peters |
 George VoskovecComrade Karden - Defense Attorney | Comrade Karden - Defense Attorney |
 Rupert DaviesGeorge Smiley | George Smiley |
 Cyril CusackControl | Control |
 Peter van EyckHans-Dieter Mundt | Hans-Dieter Mundt |
 Michael HordernAshe | Ashe |
 Robert HardyDick Carlton | Dick Carlton |
 Bernard LeePatmore | Patmore |
 Beatrix LehmannTribunal President | Tribunal President |
 Esmond KnightOld Judge | Old Judge |
 Tom SternCIA Agent | CIA Agent |
 Niall MacGinnisCheckpoint Charlie Guard | Checkpoint Charlie Guard |
| SScot FinchGerman Guide | German Guide |
 Anne BlakeMiss Crail | Miss Crail |
| GGeorge MikellCheckpoint Charlie Guard | Checkpoint Charlie Guard |
 Richard MarnerVopo Captain | Vopo Captain |
 Warren MitchellMr. Zanfrello | Mr. Zanfrello |
 Steve PlytasEast German Judge | East German Judge |
| GGraham ArmitagePawson (uncredited) | Pawson (uncredited) |
 David BauerYoung Judge (uncredited) | Young Judge (uncredited) |
 Richard CaldicotMr. Pitt - Employment Officer (uncredited) | Mr. Pitt - Employment Officer (uncredited) |
| MMarianne DeemingFrau Floerdke (uncredited) | Frau Floerdke (uncredited) |
 Walter GotellHolten (uncredited) | Holten (uncredited) |
| EEdward HarveyMan in Shop (uncredited) | Man in Shop (uncredited) |
 Geoffrey KeenBritish Sentry (Sgt.) at Checkpoint Charlie (uncredited) | British Sentry (Sgt.) at Checkpoint Charlie (uncredited) |
| KKatherine KeetonPussywillow Club Stripper (uncredited) | Pussywillow Club Stripper (uncredited) |
 Philip MadocYoung German Officer (uncredited) | Young German Officer (uncredited) |
