There were several special elections to the United States House of Representatives in 1945 during the 79th Congress.
|- ! | Dave E. Satterfield Jr. | | Democratic | 1937 | | Incumbent resigned.<br/>New member elected March 6, 1945.<br/>Democratic hold. | nowrap |
|- ! | James F. O'Connor | | Republican | 1936 | | Incumbent died January 15, 1945.<br/>New member elected June 5, 1945.<br/>Republican hold. | nowrap |
|- ! | James V. Heidinger | | Republican | 1940 | | Incumbent died in office.<br/>New member elected November 6, 1945.<br/>Republican hold. |