Internal Security Department (Singapore)

For the Bruneian domestic intelligence agency of the same name, see Internal Security Department (Brunei).

Internal Security Department (ISD)

Logo of the Internal Security Department
Agency overview
Formed	1948 (1948) (as the Singapore Special Branch)
Preceding agency	Malayan Security Service (1939–1948)
Jurisdiction	Government of Singapore
Headquarters	New Phoenix Park, 30 Irrawaddy Road, Singapore
Employees	Classified
Annual budget	Classified
Minister responsible	K. Shanmugam, Minister for Home Affairs
Agency executive	Classified, Director, ISD
Parent agency	Ministry of Home Affairs
Website	mha.gov.sg/isd
Agency ID	T08GA0034L

The Internal Security Department (ISD) is the principal security agency and domestic intelligence service of Singapore. The department is tasked with collecting and analysing intelligence, making assessments, and taking executive actions to counter national security threats to the country's sovereignty, safety, and stability. As a counter-intelligence and counter-terrorism organisation, the ISD is responsible for protecting Singapore from espionage or spying, foreign interference, covert operations, subversion, terrorism, organised crime, and political, racial or religious extremism.

The ISD is empowered to conduct mass surveillance and covert security operations. It also has the utmost right to indefinitely detain individuals without trial, when a suspect is believed to be a threat to Singapore's national security.