A list of intelligence agencies, past and present:

• Afghanistan
  • Khedamat-e Etelea'at-e Dawlati (Defunct)

• Albania
  • Sigurimi (Defunct)
  • National Intelligence Service (NIS/SHIK)

• Argentina
  • Central Nacional de Inteligenzia (CNI)

• Australia
  • Australian Security Intelligence Organisation (ASIO)
  • Australian Secret Intelligence Service (ASIS)
  • Defence Signals Directorate (DSD)

• 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)

• Canada
  • Canadian Security Intelligence Service (CSIS) http://www.csis-scrs.gc.ca/
  • Communications Security Establishment (CSE)

• China, People's Republic of
  • Ministry of State Security (MSS)

• Colombia
  • 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

• Estonia
  • Kaitsepolitseiamet

• Finland
  • 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
  • Current
    • Bundesamt fur Verfassungsschutz (BfV)
    • Bundesnachrichtendienst (BND)
    • Militärischer Abschirmdienst (MAD)
  • West Germany
    • Bundesamt fur Verfassungsschutz (BfV)
    • Bundesnachrichtendienst (BND)
    • Militärischer Abschirmdienst (MAD)
  • East Germany
    • State Security Service (SSD, Defunct)
    • Hauptverwaltung Aufklaerung, (HVA) part of the MfS (Stasi, defunct)
  • Nazi Germany
    • Abwehr
    • Gestapo
    • Sicherheitsdienst (SD)

• Greece
  • Hellenic National Intelligence Service (NIS)

• 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
  • ha-Mossad le-Modiin ule-Tafkidim Meyuhadim (Mossad)
  • Sherut ha-Bitachon ha-Klali (Shin Bet)

• Italy
  • Servizio Informazioni Generali e Sicurezza (SISDE)
  • Servizio per le Informazioni e la Sicurezza Militare (SISMI)

• Japan
  • Public Security Investigation Agency (PSIA)

• Jordan
  • General Intelligence Department

• Korea, South
  • National Intelligence Service (South Korea) (NIS)

• Libya
  • 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)

• 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
  • Current
    • 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
  • Centro Superior de Información de la Defensa (CESID) - 2002.
  • Centro Nacional de Inteligencia (CNI) (2002 - )

• Sweden
  • 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)

• 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)