The 2018 United States elections were held on Tuesday, November 6, 2018. These midterm elections occurred during Incumbent Republican President Donald Trump's term. Although the Republican Party increased its majority in the Senate, unified Republican control of Congress and the White House was brought to an end when the Democratic Party won control of the House of Representatives in what was widely characterized as a "blue wave" election as Democrats also gained governorships, statewide offices, and state legislative chambers.

The 2018 United States House of Representatives elections were held on November 6, 2018, as part of the 2018 midterm elections during President Donald Trump's term, with early voting taking place in some states in the weeks preceding that date. Voters chose representatives from all 435 congressional districts across each of the 50 U.S. states to serve in the 116th United States Congress. Non-voting delegates from the District of Columbia and four of the five inhabited U.S. territories were also elected. On Election Day, Republicans had held a House majority since January 2011.