The Alien Registration Act, popularly known as the Smith Act, 76th United States Congress, 3d session, ch. 439, 54 Stat. 670, 18 U.S.C. § 2385 is a United States federal statute that was enacted on June 28, 1940. It set criminal penalties for advocating the overthrow of the U.S. government by force or violence, and required all non-citizen adult residents to register with the federal government.

The 76th United States Congress was a meeting of the legislative branch of the United States federal government, composed of the United States Senate and the United States House of Representatives. It met in Washington, D.C., from January 3, 1939, to January 3, 1941, during the seventh and eighth years of Franklin D. Roosevelt's presidency. The apportionment of seats in the House of Representatives was based on the 1930 United States census.