The 1984 United States House of Representatives elections was an election for the United States House of Representatives on November 6, 1984, to elect members to serve in the 99th United States Congress. They coincided with the re-election of President Ronald Reagan in a landslide. This victory also yielded gains for Reagan's Republican Party in the House, where they picked up a net of sixteen seats from the Democratic Party. Despite Reagan's extremely large electoral victory, the Democrats nonetheless retained a commanding majority in the House and actually gained seats in the Senate. These elections were the last until 2020 when a member of a political party other than the Democrats, Republicans, or an independent had one or more seats in the chamber.
This would be the last time for eight years that the Democrats experienced a net loss of seats in the House.
411 incumbent members sought reelection, but 3 were defeated in primaries and 16 defeated in the general election for a total of 392 incumbents winning.
Twenty-two representatives retired. Sixteen of those seats were held by the same party, six seats changed party.
Nine Democrats retired. Four of those seats were held by Democrats and five were won by Republicans.
Thirteen Republicans retired. Twelve of those seats were held by Republicans and one was won by a Democrat.
Three Democrats lost renomination.
Thirteen Democrats lost re-election.
Three Republicans lost re-election.
There were three special elections to the 98th Congress in 1984, two of which were held on the same day as the general election for the next term.
Elections are sorted here by date then district.
Livingston, Boggs, Moore, Breaux and Long were re-elected when they received more than 50% of the vote in the Sept. 29 jungle primaries. Tauzin, Breaux and Huckaby were automatically re-elected without having to appear on a ballot.
|- ! | Les Aspin | | Democratic | 1970 | Incumbent re-elected. | nowrap |
|- ! | Robert Kastenmeier | | Democratic | 1958 | Incumbent re-elected. | nowrap |
|- ! | Steve Gunderson | | Republican | 1980 | Incumbent re-elected. | nowrap |
|- ! | Jerry Kleczka | | Democratic | 1984 | Incumbent re-elected. | nowrap |
|- ! | Jim Moody | | Democratic | 1982 | Incumbent re-elected. | nowrap |
|- ! | Tom Petri | | Republican | 1979 | Incumbent re-elected. | nowrap |
|- ! | Dave Obey | | Democratic | 1969 | Incumbent re-elected. | nowrap |
|- ! | Toby Roth | | Republican | 1978 | Incumbent re-elected. | nowrap |
|- ! | Jim Sensenbrenner | | Republican | 1978 | Incumbent re-elected. | nowrap |
|- ! American Samoa at-large | Fofà  Iosefa Fiti Sunia | | 1980 | Incumbent re-elected. | nowrap | |- ! District of Columbia at-large | Walter Fauntroy | | 1970 | Incumbent re-elected. | nowrap | |- ! Guam at-large | Antonio Borja Won Pat | | 1972 | | Incumbent lost re-election.<br/>Republican gain. | nowrap | |- ! Puerto Rico at-large | Baltasar Corrada del RÃÂo | | New Progressive/<br/>Democratic | 1976 | | Incumbent retired to run for mayor of San Juan.<br/>New resident commissioner elected.<br/>PPD gain. | nowrap | |- ! U.S. Virgin Islands at-large | Ron de Lugo | | 1972<br/>1978 <small>(retired)</small><br/>1980 | Incumbent re-elected. | nowrap |