By-elections
| By-election | Year | Incumbent | Party | Winner | Party | Cause | Retained | ||
|---|---|---|---|---|---|---|---|---|---|
| Medicine Hat | 1921 | Arthur Lewis Sifton | Unionist | Robert Gardiner | Progressive | Death | No | ||
| Yamaska | 1921 | Joseph Ernest Oscar Gladu | Laurier Liberal | Aimé Boucher | Liberal | Death | Yes | ||
| York—Sunbury | 1921 | Harry Fulton McLeod | Unionist | Richard Hanson | Conservative | Death | Yes | ||
| Peterborough West | 1921 | John Hampden Burnham | Unionist | George Newcombe Gordon | Liberal | Resignation | No | ||
| Yale | 1920 | Martin Burrell | Unionist | John Armstrong MacKelvie | Conservative | Appointed Librarian of Parliament | Yes | ||
| Elgin East | 1920 | David Marshall | Unionist | Sydney Smith McDermand | United Farmers | Death | No | ||
| St. John—Albert | 1920 | Rupert Wilson Wigmore | Unionist | Rupert Wilson Wigmore | Conservative | Recontested upon ministerial appointment | Yes | ||
| Colchester | 1920 | Fleming Blanchard McCurdy | Unionist | Fleming Blanchard McCurdy | Nationalist Liberal | Recontested upon ministerial appointment | Yes | ||
| Timiskaming | 1920 | Francis Cochrane | Unionist | Angus McDonald | Independent | Death | No | ||
| St. James | 1920 | Louis Audet Lapointe | Laurier Liberal | Fernand Rinfret | Liberal | Death | Yes | ||
| Kamouraska | 1920 | Ernest Lapointe | Laurier Liberal | Charles Adolphe Stein | Liberal | Resignation to contest Quebec East by-election | Yes | ||
| Ontario North | 1919 | Samuel Simpson Sharpe | Conservative | Robert Henry Halbert | Independent | Death | No | ||
| Quebec East | 1919 | Wilfrid Laurier | Laurier Liberal | Ernest Lapointe | Laurier Liberal | Death | Yes | ||
| Glengarry and Stormont | 1919 | John McMartin | Unionist | John Wilfred Kennedy | United Farmers | Death | No | ||
| Victoria—Carleton | 1919 | Frank Carvell | Unionist | Thomas Wakem Caldwell | United Farmers | Appointed Chairman of the Board of Railway Commissioners | No | ||
| Assiniboia | 1919 | John Gillanders Turriff | Unionist | Oliver Robert Gould | United Farmers | Called to the Senate | No | ||
| Victoria City | 1919 | Simon Fraser Tolmie | Unionist | Simon Fraser Tolmie | Unionist | Recontested upon ministerial appointment | Yes | ||
| Prince | 1919 | Joseph Read | Liberal | William Lyon Mackenzie King | Liberal | Death | Yes | ||
| Kingston | 1919 | William Folger Nickle | Conservative | Henry Lumley Drayton | Unionist | Resignation | Yes | ||
| Lanark | 1918 | Adelbert Edward Hanna | Unionist | John Alexander Stewart | Unionist | Death | Yes | ||
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