National Security Act

National Security Act may refer to:

• National Security Act, 1980, an Indian 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, a Canadian act
• National Security Act 2023 (c. 32), a UK act strengthening laws against espionage, political interference, sabotage, and assassination

National Security Law may refer to:

• National Security Law of the United States
• National Security Law of the People's Republic of China
• Macau national security law
• Hong Kong national security law
• National Security Law (Brazil)