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Edward Arnold Chapman was an English criminal and wartime spy. During the Second World War he offered his services to Nazi Germany as a spy and subsequently became a British double agent. His British Secret Service handlers codenamed him Agent Zigzag in acknowledgement of his rather erratic personal history.

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Roman Garby-Czerniawski was a Polish Air Force Captain and Allied double agent during World War II, using the codename Brutus.

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Major Francis "Frank" Edward Foley CMG was a British Secret Intelligence Service officer. As a passport control officer for the British embassy in Berlin, Foley "bent the rules" and helped thousands of Jewish families escape from Nazi Germany after Kristallnacht and before the outbreak of the Second World War. He is officially recognised as a British Hero of the Holocaust and as a Righteous Among the Nations.

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Roger Grosjean started his career as a French Air Force fighter pilot in France, England and North Africa. This involved a short stint as a Security Service (MI5) double agent during World War II. He then became a successful archeologist in Corsica.

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Johann-Nielsen Jebsen, nicknamed "Johnny", was an anti-Nazi German intelligence officer and British double agent during the Second World War. Jebsen recruited Dušan Popov to the Abwehr and through him later joined the Allied cause. Kidnapped from Lisbon by the Germans shortly before the Normandy landings, Jebsen was tortured in prison and spent time in a concentration camp before disappearing; he was presumed killed at the end of the war.

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Dušan "Duško" Popov was a Serbian triple agent who served as part of the MI6 and Abwehr during World War II, and passed off disinformation to Germany as part of the Double-Cross System and working also as agent for the Yugoslav government-in-exile in London.

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Juan Pujol García, also known as Joan Pujol Garcia, was a Spanish spy who acted as a double agent with loyalty to Great Britain against Nazi Germany during World War II, when he relocated to Britain to carry out fictitious spying activities for the Germans. He was given the codename Garbo by the British; their German counterparts codenamed him Alaric and referred to his non-existent spy network as "Arabal".

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Wulf Dietrich Christian Schmidt, later known as Harry Williamson was a Danish citizen who became a double agent working for Britain against Nazi Germany during the Second World War under the codename Tate. He was part of the Double Cross System, under which all German agents in Britain were controlled by MI5 and used to deceive Germany. Nigel West singled him out as "one of the seven spies who changed the world."