1804 and 1805 United States House of Representatives elections

The 1804 and 1805 United States House of Representatives elections were held at various dates in each state between April 24, 1804 (in New York) and August 5, 1805 (in Tennessee). The Congress first met on December 2, 1805. The elections occurred at the same time as President Thomas Jefferson's re-election.

Under Jefferson's popular administration, his party continued to gain seats in the House. Territorial acquisitions from the Louisiana Purchase and economic expansion gave voters a positive view of the Democratic-Republicans, whose majority, already commanding in the 8th Congress, now surpassed three-quarters of the total membership. Following this election, Federalists were able to secure few seats outside of New England and party legitimacy deteriorated as political thought turned away from Federalist ideals perceived to be elitist and anti-democratic.