A list of intelligence agencies, past and present:
- Afghanistan
- Khedamat-e Etelea'at-e Dawlati (Defunct)
- Khedamat-e Etelea'at-e Dawlati (Defunct)
- Albania
- Sigurimi (Defunct)
- National Intelligence Service (NIS/SHIK)
- Argentina
- Central Nacional de Inteligenzia (CNI)
- Central Nacional de Inteligenzia (CNI)
- Australia
- Belgium
- Veiligheid van de Staat (SV) (Dutch) or Surete de l'Etat (SE) (French)
- ADIV (Dutch) or Service Général du Renseignement et de la Sécurité (SGRS)
- Brazil
- Agência Brasileira de Inteligência (ABIN)
- Serviço Nacional de Informações (SNI) (Defunct)
- Bulgaria
- Durzhavna Sigurnost (DS)
- Durzhavna Sigurnost (DS)
- Canada
- China, People's Republic of
- Ministry of State Security (MSS)
- Ministry of State Security (MSS)
- Colombia
- Departamento Administrativo de Seguridad (DAS)
- Departamento Administrativo de Seguridad (DAS)
- Cuba
- Directorate General of Intelligence (DGI)
- Revolutionary Armed Forces Intelligence
- Czech Republic
- Bezpecnostni informacni sluzba (BIS)
- Urad pro zahranicni styky a informace (UZSI)
- Czechoslovakia
- Federal Directorate of Intelligence Services (FSZS, Defunct)
- Hlavni Sprava Rozvedky (HSR, Defunct)
- Denmark
- Politiets Efterretningstjeneste (PET)
- Forsvarets Efterretningstjeneste (FE)
- Egypt
- General Directorate of State Security Service
- General Directorate of State Security Service
- Estonia
- Kaitsepolitseiamet
- Kaitsepolitseiamet
- Finland
- Suojelupoliisi (Supo)
- Suojelupoliisi (Supo)
- France
- Défense et Sécurité du Territoire (DST)
- Deuxieme Bureau (Defunct)
- Service de documentation Extérieure et de Contre-espionnage (SDECE, 1946-1982)
- Direction Générale de la Sécurité Extérieure (DGSE, 1982-)
- Secretariat General de la Defense Nationale (SGDN)
- Germany
- Bundesamt fur Verfassungsschutz (BfV)
- Bundesnachrichtendienst (BND)
- Militärischer Abschirmdienst (MAD)
- West Germany
- Bundesamt fur Verfassungsschutz (BfV)
- Bundesnachrichtendienst (BND)
- East Germany
- State Security Service (SSD, Defunct)
- Hauptverwaltung Aufklaerung, (HVA) part of the Stasi
- Nazi Germany
- Greece
- Hungary
- Államvédelmi Hatóság (AVH)
- Nemzetbiztonsági Hivatal (NBH)
- India
- Central Bureau of Investigation (CBI)
- Intelligence Bureau (IB)
- Research and Analysis Wing (RAW)
- Iran
- SAVAK, Shah's security police
- Ministry of Intelligence and Security
- Iraq
- General Intelligence Directorate
- Special Security Service
- Israel
- Italy
- Servizio Informazioni Generali e Sicurezza (SISDE)
- Servizio per le Informazioni e la Sicurezza Militare (SISMI)
- Japan
- Public Security Investigation Agency (PSIA)
- Public Security Investigation Agency (PSIA)
- Jordan
- General Intelligence Department
- General Intelligence Department
- Korea, South
- National Intelligence Service (South Korea) (NIS)
- National Intelligence Service (South Korea) (NIS)
- Libya
- Jamahiriya el Mukhabarat
- Jamahiriya el Mukhabarat
- Netherlands
- Algemene Algemene Inlichtingen- en Veiligheidsdienst (AIVD)
- Binnenlandse Veiligheidsdienst (BVD) (defunct)
- New Zealand
- Government Communications Security Bureau
- Security Intelligence Service
- Norway
- Politiets Sikkerhetstjeneste (PST)
- Politiets Sikkerhetstjeneste (PST)
- Pakistan
- Pakistan Intelligence Bureau
- Directorate for Inter-Service Intelligence
- Poland
- Sluzba Bezpieczenstwa (SB, Defunct)
- Urzad Ochrony Panstwa (UOP)
- Romania
- Departamentul de Informaţii Externe (DIE)
- Direcţia de Informaţii a Armatei (DIA)
- Serviciul de Informaţii Externe (SIE)
- Serviciul de Pază şi Protecţie (SPP)
- Serviciul Român de Informaţii (SRI)
- Russia
- Federalnaya Sluzhba Bezopasnosti (FSB, successor of KGB)
- Glavnoye Razvedyvatelnoye Upravlenie (GRU)
- Sluzhba Vneshney Razvedki (SVR)
- Union of Soviet Socialist Republics (USSR)
- Cheka (1917-1922)
- Gosudarstvennoye Politicseskoye Upravleniye (GPU, 1922-1923)
- Obyedinennoye Gosudarstvennoye Politicheskoye Upravleniye (OGPU, 1923-1934)
- Narodnyi Kommissariat Vnutrennih Del (NKVD, 1934-1946)
- Ministerstvo Vnutrennih Del (MVD, 1946-1954)
- Ministerstvo Gosudarstvennoi Bezopastnosti (MGB, 1943-1953)
- Komitet Gosudarstvennoi Bezopasnosti (KGB; 1954-1991)
- South Africa
- National Intelligence Agency
- South African Secret Service
- Bureau of State Security (BOSS) (defunct)
- Spain
- Sweden
- Säkerhetspolisen (SÄPO)
- Säkerhetspolisen (SÄPO)
- Switzerland
- Nachrichtendienst (SND) http://www.vbs.admin.ch/internet/gs/snd/d/dsnd.htm
- Turkey
- Milli Istihbarat Teskilan (MIT)
- Jandarma Istihbarat ve Terorle Mucadete (JITEM)
- Turkmenistan
- Committee for National Security (KNB)
- Committee for National Security (KNB)
- United Kingdom
- Department of Naval Intelligence
- Government Communications Headquarters (GCHQ)
- Joint Intelligence Committee (JIC)
- MI8 (Defunct)
- Secret Intelligence Service (SIS/MI6)
- Security Service (MI5)
- Special Operations Executive (SOE in World War Two)
- United States
- Air Intelligence Agency (AIA)
- Army Security Agency (ASA)
- Central Intelligence Agency (CIA)
- Defense Intelligence Agency (DIA)
- Department of Homeland Security
- National Imagery and Mapping Agency (NIMA)
- Federal Bureau of Investigation (FBI)
- National Reconnaissance Office (NRO)
- National Security Agency (NSA)
- Naval Security Group (NSG)
- Office of Strategic Services (OSS, forerunner of CIA)
- United States Secret Service (Secret Service)
