National Security Act

National Security Act may refer to:

• National Security Act of 1947 (Pub.L. 80-253), an Act of Congress that constitutes the United States National Security Council, Department of Defense and Central Intelligence Agency
• National Security Act, 1980 (Act 65 of 1980), an Indian Act that authorizes detention without trial
• National Security Act, 2017 (S.C. 2019, c. 13), a Canadian Act that enacted 4 Acts and made omnibus amendments to various security legislation
• National Security Act 2023 (c. 32), an UK Act that reforms the law on espionage, criminalizes sabotage and to counter hostile foreign interreference.