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Internal Security Department

Our functions

As Singapore's premier domestic security and intelligence agency, we are entrusted with the task of safeguarding the security, stability and sovereignty of our nation.

Last updated 24 September 2025
Families flying kites with Marina Bay Sands in the background during sunset.

Keeping threats at bay

Countering terrorism and violent extremism

Learn about Singapore's proactive measures to counter terrorism and violent extremism through early intervention, intelligence operations, and community resilience.

Guarding against foreign espionage, interference and influence

Discover how Singapore safeguards its sovereignty by countering foreign espionage, interference, and influence through proactive intelligence and legal measures.

Contending with communalism

Learn how Singapore's Internal Security Department proactively safeguards racial and religious harmony by addressing communal threats and fostering inter-community cohesion.

Cyberspace – A new threat frontier

Explore how Singapore's Internal Security Department addresses cyber threats, including state-sponsored espionage and hostile information campaigns, to safeguard national security in the digital age.

Strengthening community partnerships

Discover how the Internal Security Department strengthens Singapore's resilience through community partnerships, outreach, and educational initiatives.

Read more about the Internal Security Act

The Internal Security Act (ISA) allows the Government to act pre-emptively to protect Singapore from threats to our internal security, such as terrorism, foreign subversion, sabotage, espionage, politically motivated violence by other countries and acts of violence or hatred against persons on the basis of race or religion.

To find out more about the ISA, download the ISA Booklet [PDF, 318 KB].