There were elections in 1943 to the United States House of Representatives:
| District | Vacator | Reason for change | Successor | Date successor seated |
|---|---|---|---|---|
| Missouri 6th | Vacant | Rep. Philip A. Bennett died in previous Congress | Marion T. Bennett (R) | January 12, 1943 |
| California 2nd | Harry L. Englebright (R) | Died May 13, 1943 | Clair Engle (D) | August 31, 1943 |
| Kansas 2nd | Ulysses S. Guyer (R) | Died June 5, 1943 | Errett P. Scrivner (R) | September 14, 1943 |
| Oklahoma 2nd | John C. Nichols (D) | Resigned July 3, 1943, to become vice-president of Transcontinental and Western Air. | William G. Stigler (D) | March 28, 1944 |
| New York 32nd | Francis D. Culkin (R) | Died August 4, 1943 | Hadwen C. Fuller (R) | November 2, 1943 |
| Pennsylvania 23rd | James E. Van Zandt (R) | Resigned September 24, 1943, after being called to active duty in the US Armed Forces. | D. Emmert Brumbaugh (R) | November 2, 1943 |
| Kentucky 4th | Edward W. Creal (D) | Died October 13, 1943 | Chester O. Carrier (R) | November 30, 1943 |
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