By-elections
| By-election | Year | Incumbent | Party | Winner | Party | Cause | Retained | ||
|---|---|---|---|---|---|---|---|---|---|
| Assiniboia | 1971 | Albert B. Douglas | Liberal | Bill Knight | New Democratic Party | Death | No | ||
| Central Nova | 1971 | Russell MacEwan | Progressive Conservative | Elmer M. MacKay | Progressive Conservative | Resignation | Yes | ||
| Brant | 1971 | James E. Brown | Liberal | Derek Blackburn | New Democratic Party | Appointed a judge | No | ||
| Chambly | 1971 | Bernard Pilon | Liberal | Yvon L'Heureux | Liberal | Death | Yes | ||
| Trois-Rivières | 1971 | Joseph-Alfred Mongrain | Liberal | Claude Lajoie | Liberal | Death | Yes | ||
| Lisgar | 1970 | George Muir | Progressive Conservative | Jack Murta | Progressive Conservative | Death | Yes | ||
| Frontenac | 1970 | Bernard Dumont | Ralliement Créditiste | Léopold Corriveau | Liberal | Resignation | No | ||
| Labelle | 1970 | Léo Cadieux | Liberal | Maurice Dupras | Liberal | Appointed Ambassador to France | Yes | ||
| Selkirk | 1970 | Edward Schreyer | New Democratic Party | Doug Rowland | New Democratic Party | Resignation | Yes | ||
| Comox—Alberni | 1969 | Richard J. J. Durante | Liberal | Thomas Speakman Barnett | New Democratic Party | Election declared void | No | ||
| Nanaimo—Cowichan—The Islands | 1969 | Colin Cameron | New Democratic Party | Tommy C. Douglas | New Democratic Party | Death | Yes | ||
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