The 37th United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives. It met in Washington, D.C., from March 4, 1861, to March 4, 1863, during the first two years of Abraham Lincoln's presidency. The apportionment of seats in the House of Representatives was based on the 1850 United States census.

An Act for the Release of certain Persons held to Service or Labor in the District of Columbia, 37th Cong., Sess. 2, ch. 54, 12 Stat. 376, known colloquially as the District of Columbia Compensated Emancipation Act or simply Compensated Emancipation Act, was a law that ended slavery in the District of Columbia, while providing slave owners who remained loyal to the United States in the then-ongoing Civil War to petition for compensation. Although not written by him, the act was signed by U.S. President Abraham Lincoln on April 16, 1862. April 16 is now celebrated in the city as Emancipation Day.