By-elections to the 23rd Canadian Parliament were held to fill vacancies in theHouse of Commons of Canada between the1957 federal election and the1958 federal election. TheProgressive Conservative Party of Canada led aminority government for the23rd Canadian Parliament.
Three vacant seats were filled throughby-elections.
| By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained | ||
|---|---|---|---|---|---|---|---|---|---|
| Yukon | December 16, 1957 | James Aubrey Simmons | Liberal | Erik Nielsen | Progressive Conservative | Election declared void | No | ||
| Hastings—Frontenac | November 4, 1957 | George Stanley White | Progressive Conservative | Sidney Earle Smith | Progressive Conservative | Called to the Senate | Yes | ||
| Lanark | August 26, 1957 | William G. Blair | Progressive Conservative | George Doucett | Progressive Conservative | Death | Yes | ||