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Coordinates: 1°19′24.58″N 103°50′38.72″E / 1.3234944°N 103.8440889°E / 1.3234944; 103.8440889

Logo of the Internal Security Department

The Internal Security Department (Abbreviation: ISD; simplified Chinese: 新加坡内部安全pinyin: Xīnjiāpōnèibùānquánjú) is a domestic intelligence agency of the Ministry of Home Affairs of Singapore. It was formerly part of the Ministry of Interior and Defence until it was split on 11 August 1970. It has the upmost right to detain without trial individuals suspected to be a threat to national security.

The stated mission is to confront and address security threats, including international terrorism, foreign subversion and espionage. The ISD also monitors and addresses potential threats from communism, prevention of racial tension which might affect the public peace, domestic counterterrorism, international counterterrorism, fraud against the state, surveillance, apprehension of suspected militants or terrorists and protection of Singapore's national borders.



The powers of investigation and arrest of the ISD are regulated by several laws, including

  • Criminal Procedure Code
  • Official Secrets Act
  • Internal Security Act
  • Maintenance of Religious Harmony Act


ISD was first established as part of the Special Branch in 1948 by the British colonial government. In 1963, it became part of the Malaysian Special Branch when Singapore joined the Malayan Federation. After Singapore gained independence, Internal Security Department was formally established on 17 February 1966.


See also: Timeline of Singaporean history

These events are related to ISD and internal security of Singapore.

See also


External links

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