There were several special elections to the United States House of Representatives in 1945 during the 79th Congress.
| District | Incumbent | This race | |||
|---|---|---|---|---|---|
| Member | Party | First elected | Results | Candidates | |
| Virginia 3 | Dave E. Satterfield Jr. | Democratic | 1937 (Special) | Incumbent resigned. New member elected March 6, 1945. Democratic hold. |
|
| Montana 2 | James F. O'Connor | Republican | 1936 | Incumbent died January 15, 1945. New member elected June 5, 1945. Republican hold. |
|
| Illinois 24 | James V. Heidinger | Republican | 1940 | Incumbent died in office. New member elected November 6, 1945. Republican hold. |
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