- Alec Leamas: A British field agent in charge of East German espionage
- Hans-Dieter Mundt: Leader of the East German Secret Service, the Abteilung
- Jens Fiedler: East German spy, and Mundt's deputy
- Liz Gold: English librarian and member of the Communist Party
- Control: Head of The Circus
- George Smiley: British spy, supposedly retired
- Peter Guillam: British spy
- Karl Riemeck: East German bureaucrat turned British spy
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