1802 and 1803 United States House of Representatives elections

The 1802 and 1803 United States House of Representatives elections were held at various dates in each state, from April 26, 1802 (in New York) to December 14, 1803 (in New Jersey) during President Thomas Jefferson's first term in office. It was common in the early years of the United Congress for some states to elect representatives to a Congress after it had already convened. In the case of the 8th Congress, the representatives from New Jersey were only elected after its first meeting on October 17, 1803.

The membership of the House increased significantly as a result of population gains revealed in the United States Census of 1800. The greatest growth was in territories that constituted the western regions of the country at the time, a tremendous boost for Democratic-Republican candidates. Nearly all of the new seats created in reapportionment after the 1800 census went to Democratic-Republicans, closely aligned as they were with the agrarian interests of Western farmers. As a result, the Democratic-Republicans won the largest proportion of seats that either they or the competing Federalists had ever been able to secure in any earlier Congress, a supermajority greater than two-thirds of the total number.