By-elections
| By-election | Year | Incumbent | Party | Winner | Party | Cause | Retained | ||
|---|---|---|---|---|---|---|---|---|---|
| Nicolet—Yamaska | 1949 | Lucien Dubois | Independent Liberal | Renaud Chapdelaine | Progressive Conservative | Death | No | ||
| Carleton | 1948 | G. Russell Boucher | Progressive Conservative | George A. Drew | Progressive Conservative | Resignation to provide a seat for Drew | Yes | ||
| Laval—Two Mountains | 1948 | Liguori Lacombe | Independent | Léopold Demers | Liberal | Resignation | No | ||
| Marquette | 1948 | James Allison Glen | Liberal | Stuart Sinclair Garson | Liberal | Resignation | Yes | ||
| Digby—Annapolis—Kings | 1948 | James Lorimer Ilsley | Liberal | George Clyde Nowlan | Progressive Conservative | Resignation | No | ||
| Algoma East | 1948 | Thomas Farquhar | Liberal | Lester B. Pearson | Liberal | Called to the Senate | Yes | ||
| Rosthern | 1948 | Walter Adam Tucker | Liberal | William Albert Boucher | Liberal | Resignation | Yes | ||
| Ontario | 1948 | W. E. N. Sinclair | Liberal | Arthur Henry Williams | C. C. F. | Death | No | ||
| Vancouver Centre | 1948 | Ian Alistair Mackenzie | Liberal | Rodney Young | C. C. F. | Called to the Senate | No | ||
| Yale | 1948 | Grote Stirling | Progressive Conservative | Owen Lewis Jones | C. C. F. | Resignation | No | ||
| York—Sunbury | 1947 | H. Francis G. Bridges | Liberal | Milton Gregg | Liberal | Death | Yes | ||
| Halifax | 1947 | William Chisholm Macdonald | Liberal | John Dickey | Liberal | Death | Yes | ||
| Cartier | 1947 | Fred Rose | Labour Progressive | Maurice Hartt | Liberal | Seat declared vacant by resolution of the House of Commons | No | ||
| Richelieu—Verchères | 1946 | Pierre-Joseph-Arthur Cardin | Independent | Gérard Cournoyer | Liberal | Death | No | ||
| Parkdale | 1946 | Herbert A. Bruce | Progressive Conservative | Harold Timmins | Progressive Conservative | Resignation | Yes | ||
| Portage la Prairie | 1946 | Harry Leader | Liberal | Calvert Charlton Miller | Progressive Conservative | Death | No | ||
| Pontiac | 1946 | Wallace Reginald McDonald | Liberal | Réal Caouette | Social Credit | Death | No | ||
| Glengarry | 1945 | William B. MacDiarmid | Liberal | William Lyon Mackenzie King | Liberal | Resignation to provide a seat for Mackenzie King | Yes | ||
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