A

• Defunct Afghan intelligence agencies‎ (3 P)
• Defunct Argentine intelligence agencies‎ (6 P)
• Defunct Azeri intelligence agencies‎ (1 P)

C

• Defunct Canadian intelligence agencies‎ (2 P)
• Defunct Chilean intelligence agencies‎ (1 C, 3 P)

F

• Defunct Finnish intelligence agencies‎ (1 P)
• Defunct French intelligence agencies‎ (1 C, 10 P)

G

• Defunct German intelligence agencies‎ (3 C, 4 P)

H

• Defunct Hungarian intelligence agencies‎ (3 P)

I

• Defunct Indonesian intelligence agencies‎ (1 P)
• Defunct Iranian intelligence agencies‎ (1 C, 3 P)
• Defunct Iraqi intelligence agencies‎ (1 C, 5 P)

J

• Defunct Japanese intelligence agencies‎ (8 P)

M

• Defunct Malaysian intelligence agencies‎ (1 P)

P

• Defunct Polish intelligence agencies‎ (1 C, 12 P)

R

• Defunct Romanian intelligence agencies‎ (1 C, 4 P)
• Secret services of the Russian Empire‎ (2 C)

S

• Defunct Serbian intelligence agencies‎ (1 P)
• Defunct South African intelligence agencies‎ (8 P)
• Soviet intelligence agencies‎ (7 C, 24 P)
• Defunct Spanish intelligence agencies‎ (3 P)
• Defunct Swedish intelligence agencies‎ (3 P)
• Defunct Swiss intelligence agencies‎ (1 P)

U

• Defunct Ugandan intelligence agencies‎ (2 P)
• Defunct Ukrainian intelligence agencies‎ (4 P)
• Defunct United Kingdom intelligence agencies‎ (2 C, 32 P)
• Defunct United States intelligence agencies‎ (2 C, 28 P)

V

• Defunct Vietnamese intelligence agencies‎ (1 C)

• List of defunct intelligence agencies
• List of historical secret police organizations

A

• Agentes in rebus
• Areani

B

• Barid
• Bureau for the Repression of Communist Activities
• Bureau of Barbarians

C

• Central Bureau of Investigation and Statistics
• Korean Central Intelligence Agency
• Cheka
• Chronology of Soviet secret police agencies
• Committee for State Security (Bulgaria)

D

• Dirección Federal de Seguridad
• Directorate of Information and Security of Angola

E

• Embroidered Uniform Guard

F

• Federal Office for the Protection of the Constitution and Counterterrorism
• Frumentarii

G

• Politieke Inlichtingendienst

H

• Hangash
• Hoankyoku

I

• Bureau of Investigation and Statistics

J

• Joint State Political Directorate

K

• Karakol society

M

• Main Directorate of State Security
• Ministry of National Security (Czechoslovakia)

N

• National Directorate of Intelligence and Prevention Services
• National Intelligence Service (Peru)
• National Security Service (Somalia)
• NKVD

O

• Organización Democrática Nacionalista

S

• Confederate Secret Service
• Servicio de Inteligencia Militar
• Servizio Informazioni Militare
• Servizio Informazioni Segrete
• Sigurimi
• The Special Chancellery
• Special Organization (Ottoman Empire)
• State Political Directorate
• State Security Investigations Service
• StB

U

• Umur-u Hafiye