The 7th 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, 1801, to March 4, 1803, during the first two years of Thomas Jefferson's presidency. The apportionment of seats in the House of Representatives was based on the 1790 United States census. Both chambers had a Democratic-Republican majority, except during the Special session of the Senate, when there was a Federalist majority in the Senate.

Thomas Jefferson served as the third president of the United States from March 4, 1801, to March 4, 1809. Jefferson assumed the office after defeating incumbent John Adams in the 1800 presidential election. The election was a political realignment in which the Democratic-Republican Party swept the Federalist Party out of power, ushering in a generation of Jeffersonian Republican dominance in American politics. After serving two terms, Jefferson was succeeded by Secretary of State James Madison, also of the Democratic-Republican Party.