National Services
EUROPE AND EURASIA
SHISH State Intelligence Service Albania
National Security Service Armenia
State Security Committee Republic Belarus
Intelligence-Security Agency of Bosnia and Herzegovina
Security Information Service Czech
MI6 British Secret Intelligence Service
GCHQ United Kingdom Government Communications Headquarters
NCSC United Kingdom National Cyber Security Center
State Security Service Georgia
Finnish Intelligence and Security Service
AIVD Dutch General Intelligence and Security Service
Estonian Internal Security Service
Bfv Federal Office for the Protection of the Constitution Germany
BND Federal Intelligence Service Germany
National Intelligence Service Greece
SVR Russian Foreign Intelligence
AW Polish Foreign Intelligence Agency
ABW Polish Internal Security Agency
SIED Portuguese Strategic and Defense Intelligence Service
SIS Portuguese Security Intelligence Service
CNI Spanish National Intelligence Center
SISD Swedish Intelligence and Security Directorate
MIT Turkish National Intelligence Organization
General Intelligence Agency of Mongolia
National Intelligence Service Ukraine
SOUTH AND CENTRAL ASIA
AFRICA
State Security Agency South Africa (dead link?)
EAST ASIA AND PACIFIC
Australian Defence Intelligence Organisation
Australian Defence Signals Directorate
Australian Secret Intelligence Service
Australian Security Intelligence Organisation
Hong Kong Criminal Intelligence Police
New Zealand Security Intelligence Service
Cabinet Intelligence and Research Office Japan
Public Security Intelligence Agency Japan Internal Security
National Intelligence Service Republic of Korea
Public Security Police Force of Macau
General Intelligence Agency of Mongolia
National Intelligence Agency Thailand
State Intelligence Agency Indonesia (Dead link?)
NEAR EAST (NORTH AFRICA AND MIDDLE EAST)
Ethiopian Information and Security Agency (Facebook)
GID Jordanian General Intelligence Directorate
Iraqi National Intelligence Service
Shin Bet Israel Internal Security
General Security Directorate Lebanon
General Intelligence Directorate (Presidency) Saudi Arabia
WESTERN HEMISPHERE
CCSE Canadian Communications Security Establishment
RCMP Royal Canadian Mounted Police
CSIS Canadian Security Intelligence Service
National Intelligence Directorate Columbia
National Directorate of Intelligence Peru (Dead link?)
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Directories and Indices of Security Services
List of Intelligence Agencies (Wikipedia)
List of Counterintelligence Organizations (Wikipedia)
List of Defunct Intelligence Agencies (Wikipedia)
World Intelligence and Security Agencies (FAS - Federation of American Scientists)