List of elections
| District | Incumbent | This race | |||
|---|---|---|---|---|---|
| Member | Party | First elected | Results | Candidates | |
| Kentucky 6 | Thomas R. Underwood | Democratic | 1948 | Incumbent resigned March 17, 1951 when appointed U.S. Senator. New member elected April 4, 1951. Democratic hold. |
|
| West Virginia 5 | John Kee | Democratic | 1932 | Incumbent died May 8, 1951. New member elected July 17, 1951 to finish her husband's term. Democratic hold. |
|
| Pennsylvania 33 | Frank Buchanan | Democratic | 1946 (special) | Incumbent died April 27, 1951. New member elected July 24, 1951. Democratic hold. |
|
| Maine 3 | Frank Fellows | Republican | 1940 | Incumbent died April 27, 1951. New member elected October 22, 1951. Republican hold. |
|
| New Jersey 9 | Harry L. Towe | Republican | 1942 | Incumbent resigned September 7, 1951 to become N.J. Assistant Attorney General. New member elected November 6, 1951. Republican hold. |
|
| Ohio 3 | Edward G. Breen | Democratic | 1948 | Incumbent resigned October 1, 1951, due to ill health. New member elected November 6, 1951. Republican gain. |
|
| Pennsylvania 14 | Wilson D. Gillette | Republican | 1941 (special) | Incumbent died August 7, 1951. New member elected November 6, 1951. Republican hold. |
|
| Pennsylvania 8 | Albert C. Vaughn | Republican | 1950 | Incumbent died September 1, 1951. New member elected November 6, 1951. Republican hold. |
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| Nebraska 3 | Karl Stefan | Republican | 1934 | Incumbent died August 7, 1951. New member elected December 4, 1951. Republican hold. |
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