By-elections
| By-election | Year | Incumbent | Party | Winner | Party | Cause | Retained | ||
|---|---|---|---|---|---|---|---|---|---|
| Yukon | 1957 | James Aubrey Simmons | Liberal | Erik Nielsen | Progressive Conservative | Election declared void | No | ||
| Hastings—Frontenac | 1957 | George Stanley White | Progressive Conservative | Sidney Earle Smith | Progressive Conservative | Called to the Senate | Yes | ||
| Lanark | 1957 | William G. Blair | Progressive Conservative | George H. Doucett | Progressive Conservative | Death | Yes | ||
Read more about this topic: 23rd Canadian Parliament