By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained |
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Dorchester | January 27, 1917 | Albert Sévigny | CA|Conservative (historical)|background}}| | Conservative | Albert Sévigny | CA|Conservative (historical)|background}}| | Conservative | Recontested upon appointment as Minister of Inland Revenue | Yes |
Toronto East | December 14, 1916 | Albert Edward Kemp | CA|Conservative (historical)|background}}| | Conservative | Albert Edward Kemp | CA|Conservative (historical)|background}}| | Conservative | Recontested upon appointment as Minister of Militia and Defence | Yes |
Hochelaga | October 15, 1915 | Louis Coderre | CA|Conservative (historical)|background}}| | Conservative | Esioff-Léon Patenaude | CA|Conservative (historical)|background}}| | Conservative | Appointed a judge of the Superior Court of Quebec | Yes |
Terrebonne | February 8, 1915 | Wilfrid Bruno Nantel | CA|Conservative (historical)|background}}| | Conservative | Gédéon Rochon | CA|Conservative (historical)|background}}| | Conservative | Appointed a Railway Commissioner | Yes |
Westmorland | February 1, 1915 | Henry R. Emmerson | CA|Liberal|background}}| | Liberal | Arthur Bliss Copp | CA|Liberal|background}}| | Liberal | Death | Yes |
Jacques Cartier | February 1, 1915 | Frederick D. Monk | CA|Conservative (historical)|background}}| | Conservative | Joseph Adélard DesCarries | CA|Conservative (historical)|background}}| | Conservative | Resignation (ill health) | Yes |
Prince Albert | February 1, 1915 | James McKay | CA|Conservative (historical)|background}}| | Conservative | Samuel James Donaldson | CA|Conservative (historical)|background}}| | Conservative | Appointed a judge of the Supreme Court of Saskatchewan | Yes |
London | February 1, 1915 | George Adam Clare | CA|Conservative (historical)|background}}| | Conservative | Frank Stewart Scott | CA|Conservative (historical)|background}}| | Conservative | Death | Yes |
Waterloo South | February 1, 1915 | Thomas Beattie | CA|Conservative (historical)|background}}| | Conservative | William Gray | CA|Conservative (historical)|background}}| | Conservative | Death | Yes |
Champlain | November 7, 1914 | Pierre Édouard Blondin | CA|Conservative (historical)|background}}| | Conservative | Pierre Édouard Blondin | CA|Conservative (historical)|background}}| | Conservative | Recontested upon appointment as Minister of Inland Revenue | Yes |
Quebec County | November 7, 1914 | Louis-Philippe Pelletier | CA|Conservative (historical)|background}}| | Conservative | Thomas Chase-Casgrain | CA|Conservative (historical)|background}}| | Conservative | Resignation prior to being appointed a judge | Yes |
York | December 31, 1913 | Oswald Smith Crocket | CA|Conservative (historical)|background}}| | Conservative | Harry Fulton McLeod | CA|Conservative (historical)|background}}| | Conservative | Appointed a judge of the Supreme Court of New Brunswick | Yes |
Lanark South | December 13, 1913 | John Graham Haggart | CA|Conservative (historical)|background}}| | Conservative | Adelbert Edward Hanna | CA|Conservative (historical)|background}}| | Conservative | Death | Yes |
Macdonald | December 13, 1913 | Alexander Morrison | CA|Conservative (historical)|background}}| | Conservative | Alexander Morrison | CA|Conservative (historical)|background}}| | Conservative | Election declared void | Yes |
Bruce South | October 30, 1913 | James J. Donnelly | CA|Conservative (historical)|background}}| | Conservative | Reuben Eldridge Truax | CA|Liberal|background}}| | Liberal | Called to the Senate | No |
Middlesex East | October 21, 1913 | Peter Elson | CA|Conservative (historical)|background}}| | Conservative | Samuel Francis Glass | CA|Conservative (historical)|background}}| | Conservative | Death | Yes |
Châteauguay | October 11, 1913 | James Pollock Brown | CA|Liberal|background}}| | Liberal | James Morris | CA|Conservative (historical)|background}}| | Conservative | Death | No |
Portage la Prairie | July 19, 1913 | Arthur Meighen | CA|Conservative (historical)|background}}| | Conservative | Arthur Meighen | CA|Conservative (historical)|background}}| | Conservative | Recontested upon appointment as Solicitor General | Yes |
Hochelaga | November 19, 1912 | Louis Coderre | CA|Conservative (historical)|background}}| | Conservative | Louis Coderre | CA|Conservative (historical)|background}}| | Conservative | Recontested upon appointment as Secretary of State for Canada | Yes |
Carleton | October 30, 1912 | Edward Kidd | CA|Conservative (historical)|background}}| | Conservative | William Foster Garland | CA|Conservative (historical)|background}}| | Conservative | Death | Yes |
Richelieu | October 24, 1912 | Pierre-Joseph-Arthur Cardin | CA|Liberal|background}}| | Liberal | Pierre-Joseph-Arthur Cardin | CA|Liberal|background}}| | Liberal | Election declared void | Yes |
Macdonald | October 12, 1912 | William D. Staples | CA|Conservative (historical)|background}}| | Conservative | Alexander Morrison | CA|Conservative (historical)|background}}| | Conservative | Appointed Grain Commissioner for Canada | Yes |
Simcoe South | June 10, 1912 | Haughton Lennox | CA|Conservative (historical)|background}}| | Conservative | William Alves Boys | CA|Conservative (historical)|background}}| | Conservative | Appointed a judge | Yes |
Kootenay | May 30, 1912 | Arthur Samuel Goodeve | CA|Conservative (historical)|background}}| | Conservative | Robert Francis Green | CA|Conservative (historical)|background}}| | Conservative | Appointed a Railway Commissioner | Yes |
Renfrew South | February 22, 1912 | Thomas Andrew Low | CA|Liberal|background}}| | Liberal | George Perry Graham | CA|Liberal|background}}| | Liberal | Resignation | Yes |
Nipissing | November 8, 1911 | George Gordon | CA|Conservative (historical)|background}}| | Conservative | Francis Cochrane | CA|Conservative (historical)|background}}| | Conservative | Called to the Senate | Yes |
Leeds | November 6, 1911 | George Taylor | CA|Conservative (historical)|background}}| | Conservative | William Thomas White | CA|Conservative (historical)|background}}| | Conservative | Called to the Senate | Yes |
Yale—Cariboo | November 4, 1911 | Martin Burrell | CA|Conservative (historical)|background}}| | Conservative | Martin Burrell | CA|Conservative (historical)|background}}| | Conservative | Recontested upon appointment as Minister of Agriculture | Yes |
Halifax | October 27, 1911 | Robert Borden | CA|Conservative (historical)|background}}| | Conservative | Robert Borden | CA|Conservative (historical)|background}}| | Conservative | Recontested upon appointment as Prime Minister | Yes |
Elgin West | October 27, 1911 | Thomas Wilson Crothers | CA|Conservative (historical)|background}}| | Conservative | Thomas Wilson Crothers | CA|Conservative (historical)|background}}| | Conservative | Recontested upon appointment as Minister of Labour | Yes |
St. Anne | October 27, 1911 | Charles Doherty | CA|Conservative (historical)|background}}| | Conservative | Charles Doherty | CA|Conservative (historical)|background}}| | Conservative | Recontested upon appointment as Minister of Justice | Yes |
Toronto North | October 27, 1911 | George Eulas Foster | CA|Conservative (historical)|background}}| | Conservative | George Eulas Foster | CA|Conservative (historical)|background}}| | Conservative | Recontested upon appointment as Minister of Trade and Commerce | Yes |
City and County of St. John | October 27, 1911 | John Waterhouse Daniel | CA|Conservative (historical)|background}}| | Conservative | John Douglas Hazen | CA|Conservative (historical)|background}}| | Conservative | Resignation to provide a seat for Hazen | Yes |
Victoria | October 27, 1911 | Samuel Hughes | CA|Conservative (historical)|background}}| | Liberal-Conservative | Samuel Hughes | CA|Conservative (historical)|background}}| | Liberal-Conservative | Recontested upon appointment as Minister of Militia and Defence | Yes |
Jacques Cartier | October 27, 1911 | Frederick Debartzch Monk | CA|Conservative (historical)|background}}| | Conservative | Frederick Debartzch Monk | CA|Conservative (historical)|background}}| | Conservative | Recontested upon appointment as Minister of Public Works | Yes |
Terrebonne | October 27, 1911 | Wilfrid Bruno Nantel | CA|Conservative (historical)|background}}| | Conservative | Wilfrid Bruno Nantel | CA|Conservative (historical)|background}}| | Conservative | Recontested upon appointment as Minister of Inland Revenue | Yes |
Quebec County | October 27, 1911 | Louis-Philippe Pelletier | CA|Conservative (historical)|background}}| | Conservative | Louis-Philippe Pelletier | CA|Conservative (historical)|background}}| | Conservative | Recontested upon appointment as Postmaster-General | Yes |
Grenville | October 27, 1911 | John Dowsley Reid | CA|Conservative (historical)|background}}| | Conservative | John Dowsley Reid | CA|Conservative (historical)|background}}| | Conservative | Recontested upon appointment as Minister of Customs | Yes |
Marquette | October 27, 1911 | William James Roche | CA|Conservative (historical)|background}}| | Conservative | William James Roche | CA|Conservative (historical)|background}}| | Conservative | Recontested upon appointment as Secretary of State for Canada | Yes |
Winnipeg | October 27, 1911 | Alexander Haggart | CA|Conservative (historical)|background}}| | Conservative | Robert Rogers | CA|Conservative (historical)|background}}| | Conservative | Resignation to provide a seat for Rogers | Yes |