The 2020 United States House of Representatives elections were held on November 3, 2020, to elect representatives from all 435 congressional districts across each of the 50 U.S. states to the 117th United States Congress, as well as six non-voting delegates from the District of Columbia and the inhabited U.S. territories. Special House elections were also held on various dates throughout 2020.

In the 2018 United States House of Representatives elections, the Democrats had won 235 seats. Leading up to the 2020 elections, the Democrats were projected by many polls to expand their majority by up to 15 seats due to the unpopularity of then-President Donald Trump. While Democrats ultimately retained control of the House following the 2020 elections, Republicans made a net gain of 14 seats and the Democrats entered 2021 with a narrow 222–213 House majority. This was the first time since 2004 that the Republican Party made net gains in the House during a presidential election year. This led to Democrats' smallest majority since 1942. As of 2024, this remains the last time that the Democrats have won a majority in the United States House of Representatives.

Republicans exceeded expectations in the 2020 House elections, winning back a number of seats that they lost in 2018 while successfully defending competitive seats that Democrats had hoped to flip. No Republican incumbent was defeated for re-election, while 13 incumbent Democrats were ousted by Republicans; also, several successful Democratic candidates won by smaller-than-expected margins. Many have cited Trump's presence on the ballot as having fueled high Republican turnout, while others have emphasized the Republican Party's efforts to promote their female and minority candidates.

This constitutes the 11th election since the Civil War in which the victorious presidential party lost seats in the House, after the elections of 1868, 1884, 1892, 1896, 1908, 1960, 1988, 1992, 2000, and 2016.