Counterintelligence organizations and agencies attempt to prevent foreign intelligence organizations from successfully gathering and collecting intelligence against the governments they serve.

Active counterintelligence organizations

Currently active counterintelligence organizations include the following. For former agencies, see the separate list below.

Australia

• Australian Security Intelligence Organisation (ASIO)
• Australian Secret Intelligence Service (ASIS)^[1]

Bangladesh

• National Security Intelligence (NSI)
• Directorate General of Forces Intelligence (DGFI)

Belarus

• State Security Committee of the Republic of Belarus

Belgium

• Belgian State Security Service — in Dutch, Staatsveiligheid (SV); in French, Sûreté de l'État (SE)
• Belgian General Information and Security Service — in Dutch, Algemene Dienst Inlichting en Veiligheid (ADIV); in French Service Général du Renseignement et de la Sécurité (SGRS)

Brazil

• Agência Brasileira de Inteligência (ABIN)

Canada

• Canadian Security Intelligence Service (CSIS)
• Canadian Forces National Counter-Intelligence Unit (CFNCIU),operated by the Canadian Forces Military Police Group^[2]

Croatia

• Security and Intelligence Agency (SOA)
• Military Security and Intelligence Agency (VSOA)

Czech Republic

• Bezpečnostní informační služba (BIS) — Security Information Service^[3]

Denmark

• Politiets Efterretningstjeneste (PET)

Estonia

• Estonian Internal Security Service (KaPo)

Finland

• Finnish Security Intelligence Service (SuPo)

France

• Direction générale de la sécurité intérieure (DGSI)

Germany

• Bundesnachrichtendienst (BND)
• Bundesamt für Verfassungsschutz (BfZ)
• Militärischer Abschirmdienst (MAD)

Greece

• Hellenic National Intelligence Service^[4] (NIS-EYP) Sub-Directorate for International Terrorism and Organized Crime^[5]

Hungary

• Constitution Protection Office (Hungary) (NBH)^[6]

Iceland

• Greiningardeild Ríkislögreglustjóra - National Security Unit

India

• Intelligence Bureau (IB)
• Central Bureau of Investigation (CBI)
• Research and Analysis Wing (RAW)

Ireland

• Defence Forces Directorate of Military Intelligence
• Garda Crime & Security Branch (CSB)

Iran

• Ministry of Intelligence and National Security of Iran

Israel

• Mossad
• Shin Bet (official name is Shabak)

Italy

• Agenzia Informazioni e Sicurezza Interna (AISI), formerly known as SISDE

Japan

• National Police Agency Security Bureau (警察庁警備局, Keisatsu-chō Keibi-kyoku), commonly known as "ja:公安警察, Kōan-Keisatsu, which means "public security police"" or shortly "公安, Kōan" in Japan.
• Public Security Intelligence Agency (公安調査庁, Kōanchōsa-chō)^[7]
• SDF Intelligence Security Command (自衛隊情報保全隊 Jieitai Jōhō-Hozentai)

Kenya

• National Security Intelligence Service (NSIS)^[8]

Lebanon

• Special Agency to Combat Terrorism^[9]

the Netherlands

• Algemene Inlichtingen- en Veiligheidsdienst (AIVD) — General Intelligence and Security Service
• Militaire Inlichtingen- en Veiligheidsdienst (MIVD) — Military Intelligence and Security Service

New Zealand

• New Zealand Security Intelligence Service

Pakistan

• Inter-Services Intelligence

Poland

• Agencja Bezpieczeństwa Wewnetrznego (ABW) — en. Internal Security Agency
• Służba Kontrwywiadu Wojskowego (SKW); en. Military Counterintelligence Service

Portugal

• Serviço de Informações e Segurança (SIS)

Romania

• Serviciul Român de Informaţii (SRI)
• Directorate for Military Security

Russian Federation

• Federal Security Service (FSB)

Serbia

• Bezbednosno-informativna agencija (BIA)
• Vojnobezbednosna agencija (VBA), Military Security Agency (successor of Yugoslav Kontraobaveštajna služba)

Sweden

• Säkerhetspolisen (Säpo) — Swedish Security Service

Switzerland

• Federal Office of Police — in German, Bundesamt für Polizei (BAP); in French, Office fédéral de la police; in Italian, Ufficio federale di polizia^[10]

Slovakia

• Národný bezpečnostný úrad (NBÚ) — National Security Bureau

South Africa

• National Intelligence Agency (NIA)

South Korea

• National Intelligence Service (NIS)
• Defense Counterintelligence Command (DCC)

Turkey

• National Intelligence Organization (Turkey) (MIT)
• Higher Counterterrorism Council^[11]

Ukraine

• Security Service of Ukraine (SBU)

United Kingdom

• Security Service, commonly known as MI5
• Secret Intelligence Service, also known as MI6
• Royal Air Force Police Counter Intelligence Squadron

United States

• Federal Bureau of Investigation (FBI)
• United States Army Counterintelligence (ACI)
• Air Force Office of Special Investigations (AFOSI)
• DIA's Defense Counterintelligence and Human Intelligence Center (DCHC)
• Diplomatic Security Service (DSS), U.S. Department of State (DS/ICI/CI)
• Naval Criminal Investigative Service (NCIS, formerly NIS)
• United States Marine Corps Counterintelligence
• Office of the National Counterintelligence Executive (ONCIX)
• Central Intelligence Agency (CIA)

Defunct counterintelligence organizations

These organizations are now defunct, possibly absorbed by a successor organization:

Ireland

• Army Intelligence Department
• Criminal Investigation Department (CID)

Nazi Germany

• Geheime Staatspolizei (Gestapo)
• Geheime Feldpolizei (GFP) (Secret Field Police) (1939-1945)
• Sicherheitsdienst — Security Service of the SS, particularly the "inland SS" branch
• Abwehr (military intelligence)

Empire of Japan

• Kenpeitai - Army military police
• Tokubetsu Keisatsutai - Navy military police
• Tokubetsu Kōtō Keisatsu (特別高等警察, Special Higher Police) - civil police

Poland

• Wojskowe Służby Informacyjne (WSI) — dissolved in 2006 for having been involved in illegal activities

Yugoslavia

• Kontraobaveštajna služba (KOS), Army Counter-Intelligence Service
• Uprava Državne Bezbednosti (UDBA), State Security Directorate

Soviet Union and Imperial Russia

• Committee for State Security (KGB) — previously MGB, NKVD, OGPU, Cheka, and, during imperial times, Okhrana

Ukraine

• Kontrrazvedka, Makhnovist counterintelligence agency

United Kingdom

• 14 Intelligence Company — also known as "the Det"

United States

• Army Counter Intelligence Corps
• Counterintelligence Field Activity