By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained |
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Medicine Hat | June 27, 1921 | Arthur Lewis Sifton | CA|Coalition|background}}| | Unionist | Robert Gardiner | CA|Progressive|background}}| | Progressive | Death | No |
Yamaska | May 28, 1921 | Oscar Gladu | CA|Liberal|background}}| | Laurier Liberal | Aimé Boucher | CA|Liberal|background}}| | Liberal | Death | Yes |
York—Sunbury | May 28, 1921 | Harry Fulton McLeod | CA|Coalition|background}}| | Unionist | Richard Hanson | CA|Conservative (historical)|background}}| | Conservative | Death | Yes |
Peterborough West | February 7, 1921 | John Hampden Burnham | CA|Coalition|background}}| | Unionist | George Newcombe Gordon | CA|Liberal|background}}| | Liberal | Resignation | No |
Yale | November 22, 1920 | Martin Burrell | CA|Coalition|background}}| | Unionist | John Armstrong MacKelvie | CA|Conservative (historical)|background}}| | Conservative | Appointed Librarian of Parliament | Yes |
Elgin East | November 22, 1920 | David Marshall | CA|Coalition|background}}| | Unionist | Sydney Smith McDermand | CA|ON United Farmers|background}}| | United Farmers | Death | No |
St. John—Albert | September 20, 1920 | Rupert Wilson Wigmore | CA|Coalition|background}}| | Unionist | Rupert Wilson Wigmore | CA|Conservative (historical)|background}}| | Conservative | Recontested upon appointment as Minister of Customs and Inland Revenue | Yes |
Colchester | September 20, 1920 | Fleming Blanchard McCurdy | CA|Coalition|background}}| | Unionist | Fleming Blanchard McCurdy | CA|Coalition|background}}| | Nationalist Liberal | Recontested upon appointment as Minister of Public Works | Yes |
Timiskaming | April 7, 1920 | Francis Cochrane | CA|Coalition|background}}| | Unionist | Angus McDonald | CA|Independent|background}}| | Independent | Death | No |
St. James | April 7, 1920 | Louis Audet Lapointe | CA|Liberal|background}}| | Laurier Liberal | Fernand Rinfret | CA|Liberal|background}}| | Liberal | Death | Yes |
Kamouraska | March 31, 1920 | Ernest Lapointe | CA|Liberal|background}}| | Laurier Liberal | Charles Adolphe Stein | CA|Liberal|background}}| | Liberal | Resignation to contest Quebec East by-election | Yes |
Ontario North | December 9, 1919 | Samuel Simpson Sharpe | CA|Conservative (historical)|background}}| | Conservative | Robert Henry Halbert | CA|Independent|background}}| | Independent | Death | No |
Quebec East | October 27, 1919 | Wilfrid Laurier | CA|Liberal|background}}| | Laurier Liberal | Ernest Lapointe | CA|Liberal|background}}| | Laurier Liberal | Death | Yes |
Glengarry and Stormont | October 27, 1919 | John McMartin | CA|Coalition|background}}| | Unionist | John Wilfred Kennedy | CA|ON United Farmers|background}}| | United Farmers | Death | No |
Assiniboia | October 27, 1919 | John Gillanders Turriff | CA|Coalition|background}}| | Unionist | Oliver Robert Gould | CA|United Farmers|background}}| | United Farmers | Called to the Senate | No |
Victoria City | October 27, 1919 | Simon Fraser Tolmie | CA|Coalition|background}}| | Unionist | Simon Fraser Tolmie | CA|Coalition|background}}| | Unionist | Recontested upon appointment as Minister of Agriculture. | Yes |
Prince | October 20, 1919 | Joseph Read | CA|Liberal|background}}| | Liberal | William Lyon Mackenzie King | CA|Liberal|background}}| | Liberal | Death | Yes |
Kingston | October 20, 1919 | William Folger Nickle | CA|Conservative (historical)|background}}| | Conservative | Henry Lumley Drayton | CA|Coalition|background}}| | Unionist | Resignation | Yes |
Victoria—Carleton | October 17, 1919 | Frank Carvell | CA|Coalition|background}}| | Unionist | Thomas Wakem Caldwell | CA|United Farmers|background}}| | United Farmers | Appointed Chairman of the Board of Railway Commissioners | No |
Lanark | May 2, 1918 | Adelbert Edward Hanna | CA|Coalition|background}}| | Unionist | John Alexander Stewart | CA|Coalition|background}}| | Unionist | Death | Yes |
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