- male
- Mikel Lejarza was a member of Spanish intelligence service. During the 1970s, he worked undercover as a double agent for terrorist organization...
- female, deceased (1970)
- Mathilde Carré was a French Resistance agent during World War II who turned a double agent. Mathilde Carré was born in Le Creusot, France. In the 19...
- female, deceased (1995)
- Odette Marie Celine Sansom, GC, MBE, Chevalier de la légion d'honneur, (April 28, 1912 - March 13, 1995) was an Allied heroine of World War II. O...
- male
- Arthur George Owens (died 1976) was a Welsh electrical engineer who acted as a double agent during World War II. He was working for MI5 while...
- female, deceased (1897)
- Loreta Janeta Velazquez (1842?-1897?) was a US woman who, according to her own account, took part in the American Civil War disguised as a male...
- male, deceased (1985)
- Roman Czerniawski was a Polish Air Force Captain and Allied double agent during World War II, using the codename BRUTUS. Czerniawski graduated in...
- male, 449 years old
- Gilbert Gifford (1560-1590) was a double agent who worked for Sir Francis Walsingham and played a role in the uncovering of the Babington plot....
- male, deceased (1918)
- Yevno Azef (1869-1918, also transliterated as "Evno" Azef), was a Russian socialist revolutionary who was also a double agent working both as an...
- male, deceased (1690)
- Sir Richard Willis (13 January 1613/1614 – December 1690) was a notable figure of the English Civil War and its aftermath. A cavalry officer un...
- male
- William G. Sebold (1899-?), born Wilhelm Georg Debrowski in Mülheim, Germany, was a spy in the United States during World War II who was working f...
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