National Security Act may refer to:

• National Security Act (India), law to provide for preventive detention
• National Security Act (South Korea), regarding seditious activities
• National Security Act of 1947, a United States law that established the Central Intelligence Agency
• National Security Act 2017 (Canada)
• National Security Act 2023, a UK act strengthening laws against espionage, political interference, sabotage, and assassination

• National Security Law (disambiguation)
• NSA (disambiguation)

This disambiguation page lists articles associated with the title National Security Act.
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