The 1978 United States House of Representatives elections was an election for the United States House of Representatives on November 7, 1978, to elect members to serve in the 96th United States Congress. They occurred in the middle of Democratic President Jimmy Carter's term, amidst an energy crisis and rapid inflation. The Democratic Party lost a net of 15 seats to the Republican Party, and thus lost their two-thirds supermajority, but still maintained a large 277-seat majority.
As of , this was the last midterm election where the Democrats managed to maintain a majority in the House of Representatives under a Democratic president and the last midterm election in which a registered third party member was elected.
Overall results
Source: Election Statistics - Office of the Clerk
Special elections
Alabama
Alaska
Arizona
Arkansas
California
Colorado
Connecticut
Delaware
Florida
Georgia
Hawaii
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
Louisiana
Maine
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Montana
Nebraska
Nevada
New Hampshire
New Jersey
New Mexico
New York
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
Pennsylvania
Rhode Island
South Carolina
South Dakota
Tennessee
Texas
Utah
Vermont
Virginia
Washington
West Virginia
Wisconsin
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| Les Aspin
| | Democratic
| 1970
| Incumbent re-elected. | nowrap |
|-
|
| Robert Kastenmeier
| | Democratic
| 1958
| Incumbent re-elected. | nowrap |
|-
|
| Alvin Baldus
| | Democratic
| 1974
| Incumbent re-elected. | nowrap |
|-
|
| Clement J. Zablocki
| | Democratic
| 1948
| Incumbent re-elected. | nowrap |
|-
|
| Henry S. Reuss
| | Democratic
| 1954
| Incumbent re-elected. | nowrap |
|-
|
| William A. Steiger
| | Republican
| 1966
| Incumbent re-elected. | nowrap |
|-
|
| Dave Obey
| | Democratic
| 1969
| Incumbent re-elected. | nowrap |
|-
|
| Robert John Cornell
| | Democratic
| 1974
| | Incumbent lost re-election.New member elected.Republican gain. | nowrap |
|-
|
| Bob Kasten
| | Republican
| 1974
| | Incumbent retired to run for Governor of Wisconsin.New member elected.Republican hold. | nowrap |