# 12th Canadian Parliament

The 12th Canadian Parliament was in session from 15 November 1911 until 6 October 1917. The membership was set by the 1911 federal election on 21 September 1911, and it changed only somewhat due to resignations and by-elections until it was dissolved prior to the 1917 election. At 5 years, 10 months and 22 days, it was the longest parliament in Canadian history. The parliament was extended beyond the normal limit of five years by the British North America Act, 1916 as a result of World War I.
It was controlled by a Conservative/Liberal-Conservative majority under Prime Minister Sir Robert Borden and the 9th Canadian Ministry. The Official Opposition was the Liberal Party, led by Wilfrid Laurier. The last year of the wartime parliament was dominated by the Conscription Crisis of 1917. At the end of the parliament, a new ministry, the Union Government, was formed by Borden as a wartime coalition government including Liberals. Laurier refused to join and those Liberals who supported Borden took the name Liberal-Unionists. The Union Government went on to win the 1917 federal election.
The Speaker was first Thomas Simpson Sproule, and later Albert Sévigny. See also List of Canadian electoral districts 1907-1914 for a list of the ridings in this parliament.
There were seven sessions of the 12th Parliament:
| Session | Start | End |
| 1st | 15 November 1911 | 1 April 1912 |
| 2nd | 21 November 1912 | 6 June 1913 |
| 3rd | 15 January 1914 | 12 June 1914 |
| 4th | 18 August 1914 | 22 August 1914 |
| 5th | 4 February 1915 | 15 April 1915 |
| 6th | 12 January 1916 | 18 May 1916 |
| 7th | 18 January 1917 | 20 September 1917 |

## List of members

Following is a full list of members of the twelfth Parliament listed first by province, then by electoral district. Party leaders are italicized. Parliamentary secretaries is indicated by "‡". Cabinet ministers are in boldface. The Prime Minister is both. The Speaker is indicated by "(†)".
Electoral districts denoted by an asterisk (*) indicates that district was represented by two members.

### Alberta

| Electoral district | Name | Party | First elected/previously elected |
| Calgary | Richard Bedford Bennett | Conservative | 1911 |
| Edmonton | Frank Oliver | Liberal | 1896 |
| Macleod | David Warnock | Liberal | 1911 |
| Medicine Hat | William Ashbury Buchanan | Liberal | 1911 |
| Red Deer | Michael Clark | Liberal | 1908 |
| Strathcona | James McCrie Douglas | Liberal | 1909 |
| Victoria | William Henry White | Liberal | 1908 |

### British Columbia

| Electoral district | Name | Party | First elected/previously elected |
| Comox—Atlin | Herbert Sylvester Clements | Conservative | 1904, 1911 |
| Kootenay | Arthur Samuel Goodeve (until 4 May 1912 railway appointment) | Conservative | 1908 |
| Kootenay | Robert Francis Green (by-election of 30 May 1912) | Conservative | 1912 |
| Nanaimo | Francis Henry Shepherd | Conservative | 1911 |
| New Westminster | James Davis Taylor | Conservative | 1908 |
| Vancouver City | Henry Herbert Stevens | Conservative | 1911 |
| Victoria City | George Henry Barnard | Conservative | 1908 |
| Yale—Cariboo | Martin Burrell (until 10 October 1911 ministerial appointment) | Conservative | 1908 |
| Yale—Cariboo | Martin Burrell (by-election of 4 November 1911) | Conservative | 1908 |

### Manitoba

| Electoral district | Name | Party | First elected/previously elected |
| Brandon | James Albert Manning Aikins | Conservative | 1911 |
| Dauphin | Robert Cruise | Liberal | 1911 |
| Lisgar | William Henry Sharpe | Conservative | 1908 |
| Macdonald | William D. Staples (until 10 April 1912 commissioner appointment) | Conservative | 1904 |
| Macdonald | Alexander Morrison (by-election of 12 October 1912, until election voided 10 November 1913) | Conservative | 1912 |
| Macdonald | Alexander Morrison (by-election of 13 December 1913) | Conservative | 1912 |
| Marquette | William James Roche (until 10 October 1911 Secretary of State appointment) | Conservative | 1896 |
| Marquette | William James Roche (by-election of 27 October 1911) | Conservative | 1896 |
| Portage la Prairie | Arthur Meighen (until 26 June 1913 Solicitor General appointment) | Conservative | 1908 |
| Portage la Prairie | Arthur Meighen (by-election of 19 July 1913) | Conservative | 1908 |
| Provencher | John Patrick Molloy | Liberal | 1908 |
| Selkirk | George Henry Bradbury | Conservative | 1908 |
| Souris | Frederick Laurence Schaffner | Conservative | 1904 |
| Winnipeg | Alexander Haggart (resigned 11 October 1911) | Conservative | 1908 |
| Winnipeg | Robert Rogers (by-election of 27 October 1911) | Conservative | 1911 |

### New Brunswick

| Electoral district | Name | Party | First elected/previously elected |
| Carleton | Frank Broadstreet Carvell | Liberal | 1904 |
| Charlotte | Thomas Aaron Hartt | Conservative | 1911 |
| City and County of St. John | John Waterhouse Daniel (resigned 17 October 1911) | Conservative | 1904 |
| City and County of St. John | John Douglas Hazen (by-election of 27 October 1911) | Conservative | 1891, 1911 |
| City of St. John | William Pugsley | Liberal | 1904 |
| Gloucester | Onésiphore Turgeon | Liberal | 1900 |
| Kent | Ferdinand-Joseph Robidoux | Conservative | 1911 |
| King's and Albert | George William Fowler | Conservative | 1900, 1911 |
| Northumberland | William Stewart Loggie | Liberal | 1904 |
| Restigouche | James Reid | Liberal | 1900 |
| Sunbury—Queen's | Hugh Havelock McLean | Liberal | 1908 |
| Victoria | Pius Michaud | Liberal | 1907 |
| Westmorland | Henry Emmerson (died 9 July 1914) | Liberal | 1900 |
| Westmorland | Arthur Bliss Copp (by-election of 1 February 1915) | Liberal | 1915 |
| York | Oswald Smith Crocket (until 11 December 1913 judicial appointment) | Conservative | 1904 |
| York | Harry Fulton McLeod (by-election of 31 December 1913) | Conservative | 1913 |

### Nova Scotia

| Electoral district | Name | Party | First elected/previously elected |
| Annapolis | Avard Longley Davidson | Conservative | 1911 |
| Antigonish | William Chisholm | Liberal | 1905 |
| Cape Breton South | William F. Carroll | Liberal | 1911 |
| Colchester | John Stanfield | Conservative | 1907 |
| Cumberland | Edgar Nelson Rhodes (†) | Conservative | 1908 |
| Digby | Clarence Jameson | Conservative | 1908 |
| Guysborough | John Howard Sinclair | Liberal | 1904 |
| Halifax* | Robert Laird Borden (until 10 October 1911 Prime Minister appointment) | Conservative | 1896, 1905, 1908 |
| Halifax* | Robert Laird Borden (by-election of 27 October 1911) | Conservative | 1896, 1905, 1908 |
| Halifax* | Alexander Kenneth Maclean | Liberal | 1904 |
| Hants | Hadley Brown Tremain | Conservative | 1911 |
| Inverness | Alexander William Chisholm | Liberal | 1904 |
| Kings | Arthur de Witt Foster | Conservative | 1911 |
| Lunenburg | Dugald Stewart | Conservative | 1911 |
| North Cape Breton and Victoria | Daniel Duncan McKenzie | Liberal | 1904, 1908 |
| Pictou | Edward Mortimer Macdonald | Liberal | 1904 |
| Richmond | George William Kyte | Liberal | 1908 |
| Shelburne and Queen's | Fleming Blanchard McCurdy ‡ | Conservative | 1911 |
| Yarmouth | Bowman Brown Law | Liberal | 1902 |
| Yarmouth | Bowman Brown Law died in the 1916 Parliament fire | Vacant | 1902 |

### Ontario

| Electoral district | Name | Party | First elected/previously elected |
| Algoma East | William Ross Smyth | Conservative | 1908 |
| Algoma West | Arthur Cyril Boyce | Conservative | 1904 |
| Brantford | William Foster Cockshutt | Conservative | 1904, 1911 |
| Brant | John Henry Fisher | Conservative | 1911 |
| Brockville | John Webster | Conservative | 1911 |
| Bruce North | Hugh Clark ‡ | Conservative | 1911 |
| Bruce South | James J. Donnelly (until 26 May 1913 Senate appointment) | Conservative | 1904, 1908 |
| Bruce South | Reuben Eldridge Truax (by-election of 30 October 1913) | Liberal | 1913 |
| Carleton | Edward Kidd (died 16 September 1912) | Conservative | 1909 |
| Carleton | William Foster Garland (by-election of 30 October 1912) | Conservative | 1912 |
| Dufferin | John Best | Conservative | 1909 |
| Dundas | Andrew Broder | Conservative | 1896 |
| Durham | Charles Jonas Thornton | Conservative | 1900, 1908 |
| Elgin East | David Marshall | Conservative | 1906 |
| Elgin West | Thomas Wilson Crothers (until 10 October 1911 ministerial appointment) | Conservative | 1908 |
| Elgin West | Thomas Wilson Crothers (by-election of 27 October 1911) | Conservative | 1908 |
| Essex North | Oliver James Wilcox | Conservative | 1909 |
| Essex South | Alfred Henry Clarke | Liberal | 1904 |
| Frontenac | John Wesley Edwards | Conservative | 1908 |
| Glengarry | John Angus McMillan | Liberal | 1908 |
| Grenville | John Dowsley Reid (until 10 October 1911 ministerial appointment) | Conservative | 1896 |
| Grenville | John Dowsley Reid (by-election of 27 October 1911) | Conservative | 1896 |
| Grey East | Thomas Simpson Sproule (†) | Conservative | 1878 |
| Grey North | William Sora Middlebro | Conservative | 1908 |
| Grey South | Robert James Ball | Conservative | 1911 |
| Haldimand | Francis Ramsey Lalor | Conservative | 1904 |
| Halton | David Henderson | Conservative | 1887, 1888 |
| Hamilton East | Samuel Barker | Conservative | 1900 |
| Hamilton West | Thomas Joseph Stewart | Conservative | 1908 |
| Hastings East | William Barton Northrup | Conservative | 1892, 1900 |
| Hastings West | Edward Guss Porter | Conservative | 1902 |
| Huron East | James Bowman | Conservative | 1911 |
| Huron South | Jonathan Joseph Merner | Conservative | 1911 |
| Huron West | Edward Norman Lewis | Conservative | 1904 |
| Kent East | David Alexander Gordon | Liberal | 1904 |
| Kent West | Archibald Blake McCoig | Liberal | 1908 |
| Kingston | William Folger Nickle | Conservative | 1911 |
| Lambton East | Joseph Elijah Armstrong | Conservative | 1904 |
| Lambton West | Frederick Forsyth Pardee | Liberal | 1905 |
| Lanark North | William Thoburn | Conservative | 1908 |
| Lanark South | John Graham Haggart (died 13 March 1913) | Conservative | 1872 |
| Lanark South | Adelbert Edward Hanna (by-election of 13 December 1913) | Conservative | 1913 |
| Leeds | George Taylor (resigned 25 October 1911) | Conservative | 1882 |
| Leeds | William Thomas White (by-election of 6 November 1911) | Conservative | 1911 |
| Lennox and Addington | William James Paul | Conservative | 1911 |
| Lincoln | Edward Arthur Lancaster | Conservative | 1900 |
| London | Thomas Beattie (died 2 December 1914) | Conservative | 1891, 1900 |
| London | William Gray (by-election of 1 February 1915) | Conservative | 1915 |
| Middlesex East | Peter Elson (died 11 June 1913) | Conservative | 1904 |
| Middlesex East | Samuel Francis Glass (by-election of 21 October 1913) | Conservative | 1913 |
| Middlesex North | George Adam Elliott | Conservative | 1911 |
| Middlesex West | Duncan Campbell Ross | Liberal | 1909 |
| Muskoka | William Wright | Conservative | 1904 |
| Nipissing | George Gordon (resigned 25 October 1911) | Conservative | 1908 |
| Nipissing | Francis Cochrane (by-election of 8 November 1911) | Conservative | 1911 |
| Norfolk | William Andrew Charlton | Liberal | 1911 |
| Northumberland East | Henry Joseph Walker | Conservative | 1911 |
| Northumberland West | Charles Arthur Munson | Conservative | 1911 |
| Ontario North | Samuel Simpson Sharpe | Conservative | 1908 |
| Ontario South | William Smith | Conservative | 1891, 1892, 1911 |
| Ottawa (City of)* | John Léo Chabot | Conservative | 1911 |
| Ottawa (City of)* | Alfred Ernest Fripp | Conservative | 1911 |
| Oxford North | Edward Walter Nesbitt | Liberal | 1908 |
| Oxford South | Donald Sutherland | Conservative | 1911 |
| Parry Sound | James Arthurs | Conservative | 1908 |
| Peel | Richard Blain | Conservative | 1900 |
| Perth North | Hugh Boulton Morphy | Conservative | 1911 |
| Perth South | Michael Steele | Conservative | 1911 |
| Peterborough East | John Albert Sexsmith | Conservative | 1908 |
| Peterborough West | John Hampden Burnham | Conservative | 1911 |
| Prescott | Edmond Proulx | Liberal | 1904 |
| Prince Edward | Bernard Rickart Hepburn | Conservative | 1911 |
| Renfrew North | Gerald Verner White | Conservative | 1906 |
| Renfrew South | Thomas Andrew Low (until resignation) | Liberal | 1908 |
| Renfrew South | George Perry Graham (by-election of 22 February 1912) | Liberal | 1907, 1912 |
| Russell | Charles Murphy | Liberal | 1904 |
| Simcoe East | William Humphrey Bennett | Conservative | 1892, 1911 |
| Simcoe North | John Allister Currie | Conservative | 1908 |
| Simcoe South | Haughton Lennox (until judicial appointment) | Conservative | 1900 |
| Simcoe South | William Alves Boys (by-election of 10 June 1912) | Conservative | 1912 |
| Stormont | Duncan Orestes Alguire | Conservative | 1911 |
| Thunder Bay and Rainy River | John James Carrick | Conservative | 1911 |
| Toronto Centre | Edmund James Bristol | Conservative | 1905 |
| Toronto East | Albert Edward Kemp (until ministerial appointment) | Conservative | 1900, 1911 |
| Toronto East | Albert Edward Kemp (by-election of 14 December 1916) | Conservative | 1900, 1911 |
| Toronto North | George Eulas Foster (until ministerial appointment) | Conservative | 1882, 1904 |
| Toronto North | George Eulas Foster (by-election of 27 October 1911) | Conservative | 1882, 1904 |
| Toronto South | Angus Claude Macdonell | Conservative | 1904 |
| Toronto West | Edmund Boyd Osler | Conservative | 1896 |
| Victoria | Sam Hughes (until ministerial appointment) | Liberal-Conservative | 1892 |
| Victoria | Sam Hughes (by-election of 27 October 1911) | Liberal-Conservative | 1892 |
| Waterloo North | William George Weichel | Conservative | 1911 |
| Waterloo South | George Adam Clare (died in office) | Conservative | 1900 |
| Waterloo South | Frank Stewart Scott (by-election of 1 February 1915) | Conservative | 1915 |
| Welland | William Manly German | Liberal | 1891, 1900 |
| Wellington North | William Aurelius Clarke | Conservative | 1911 |
| Wellington South | Hugh Guthrie | Liberal | 1900 |
| Wentworth | Gordon Crooks Wilson | Conservative | 1911 |
| York Centre | Thomas George Wallace | Conservative | 1908 |
| York North | John Alexander Macdonald Armstrong | Conservative | 1911 |
| York South | William Findlay Maclean | Independent Conservative | 1892 |

### Prince Edward Island

| Electoral district | Name | Party | First elected/previously elected |
| King's | James Joseph Hughes | Liberal | 1900, 1911 |
| Prince | James William Richards | Liberal | 1908 |
| Queen's* | Angus Alexander McLean | Conservative | 1904, 1911 |
| Queen's* | Donald Nicholson | Conservative | 1911 |

### Quebec

| Electoral district | Name | Party | First elected/previously elected |
| Argenteuil | George Halsey Perley | Conservative | 1904 |
| Bagot | Joseph Edmond Marcile | Liberal | 1898 |
| Beauce | Henri Sévérin Béland | Liberal | 1902 |
| Beauharnois | Louis-Joseph Papineau | Conservative | 1908 |
| Bellechasse | Joseph Octave Lavallée | Conservative | 1911 |
| Berthier | Joseph Arthur Barrette | Conservative | 1911 |
| Bonaventure | Charles Marcil | Liberal | 1900 |
| Brome | George Harold Baker | Conservative | 1911 |
| Chambly—Verchères | Joseph Hormisdas Rainville | Conservative | 1911 |
| Champlain | Pierre Édouard Blondin (until 20 October 1914 ministerial appointment) | Conservative | 1908 |
| Champlain | Pierre Édouard Blondin (by-election of 7 November 1914) | Conservative | 1908 |
| Charlevoix | Joseph David Rodolphe Forget | Conservative | 1904 |
| Chicoutimi—Saguenay | Joseph Girard | Independent Conservative | 1900 |
| Châteauguay | James Pollock Brown (died 30 May 1913) | Liberal | 1891 |
| Châteauguay | James Morris (by-election of 11 October 1913) | Conservative | 1913 |
| Compton | Frederick Robert Cromwell | Conservative | 1911 |
| Dorchester | Albert Sévigny (until 8 January 1917 ministerial appointment) (†) | Conservative | 1911 |
| Dorchester | Albert Sévigny (by-election of 27 January 1917) (†) | Conservative | 1911 |
| Drummond—Arthabaska | Joseph Ovide Brouillard | Liberal | 1911 |
| Gaspé | Louis-Philippe Gauthier | Conservative | 1911 |
| Hochelaga | Louis Coderre (until 29 October 1912 Secretary of State appointment) | Conservative | 1911 |
| Hochelaga | Louis Coderre (by-election of 19 November 1912, until 6 October 1915 judicial appointment) | Conservative | 1911 |
| Hochelaga | Esioff-Léon Patenaude (by-election of 15 October 1915) | Conservative | 1915 |
| Huntingdon | James Alexander Robb | Liberal | 1908 |
| Jacques Cartier | Frederick Debartzch Monk (until 10 October 1911 ministerial appointment) | Conservative | 1896 |
| Jacques Cartier | Frederick Debartzch Monk (by-election of 27 October 1911, resigned 2 March 1914) | Conservative | 1896 |
| Jacques Cartier | Joseph Adélard Descarries (by-election of 1 February 1915) | Conservative | 1915 |
| Joliette | Joseph Pierre Octave Guilbault | Conservative | 1911 |
| Kamouraska | Ernest Lapointe | Liberal | 1904 |
| Labelle | Honoré Achim | Conservative | 1911 |
| Labelle | Honoré Achim | Liberal |
| Laprairie—Napierville | Roch Lanctôt | Liberal | 1904 |
| L'Assomption | Paul-Arthur Séguin | Liberal | 1908 |
| Laval | Charles Avila Wilson | Liberal | 1908 |
| Lévis | Joseph Boutin Bourassa | Liberal | 1911 |
| L'Islet | Eugène Paquet | Conservative | 1904 |
| Lotbinière | Edmond Fortier | Liberal | 1900 |
| Maisonneuve | Alphonse Verville | Labour | 1906 |
| Maskinongé | Adélard Bellemare | Independent Conservative | 1911 |
| Mégantic | Lucien Turcotte Pacaud | Liberal | 1911 |
| Missisquoi | William Frederic Kay | Liberal | 1911 |
| Montcalm | David Arthur Lafortune | Liberal | 1909 |
| Montmagny | David Ovide L'Espérance | Conservative | 1911 |
| Montmorency | Joseph David Rodolphe Forget | Conservative | 1904 |
| Nicolet | Paul-Émile Lamarche | Conservative | 1911 |
| Pontiac | Gerald Hugh Brabazon | Conservative | 1904, 1911 |
| Portneuf | Michel-Siméon Delisle | Liberal | 1900 |
| Quebec-Centre | Arthur Lachance | Liberal | 1905 |
| Quebec County | Louis-Philippe Pelletier (until 10 October 1911 Postmaster General appointment) | Conservative | 1911 |
| Quebec County | Louis-Philippe Pelletier (by-election of 27 October 1911, resigned 20 October 1914) | Conservative | 1911 |
| Quebec County | Thomas Chase Casgrain (by-election of 7 November 1914) | Conservative | 1914 |
| Quebec East | Wilfrid Laurier | Liberal | 1874 |
| Quebec West | William Power | Liberal | 1902, 1911 |
| Richelieu | Arthur Cardin (until election voided 29 April 1912) | Liberal | 1911 |
| Richelieu | Arthur Cardin (by-election of 24 October 1912) | Liberal | 1911 |
| Richmond—Wolfe | Edmund William Tobin | Liberal | 1900 |
| Rimouski | Herménégilde Boulay | Conservative | 1911 |
| Rouville | Rodolphe Lemieux | Liberal | 1896 |
| St. Anne | Charles Joseph Doherty (until 10 October 1911) | Conservative | 1908 |
| St. Anne | Charles Joseph Doherty (by-election of 27 October 1911) | Conservative | 1908 |
| St. Antoine | Herbert Brown Ames | Conservative | 1904 |
| St. Hyacinthe | Louis Joseph Gauthier | Liberal | 1911 |
| St. James | Louis Audet Lapointe | Liberal | 1911 |
| St. Johns—Iberville | Marie Joseph Demers | Liberal | 1906 |
| St. Lawrence | Robert Bickerdike | Liberal | 1900 |
| St. Mary | Médéric Martin | Liberal | 1908 |
| Shefford | Georges Henri Boivin | Liberal | 1911 |
| Town of Sherbrooke | Francis N. McCrea | Liberal | 1911 |
| Soulanges | Wilfrid Laurier | Liberal | 1874, 1877 |
| Stanstead | Charles Henry Lovell | Liberal | 1907 |
| Témiscouata | Charles Arthur Gauvreau | Liberal | 1897 |
| Terrebonne | Wilfrid Bruno Nantel (until 10 October 1911 ministerial appointment) | Conservative | 1908 |
| Terrebonne | Wilfrid Bruno Nantel (by-election of 27 October 1911, until 20 October 1914 railway appointment) | Conservative | 1908 |
| Terrebonne | Gédéon Rochon (by-election of 8 February 1915) | Conservative | 1915 |
| Three Rivers and St. Maurice | Jacques Bureau | Liberal | 1900 |
| Two Mountains | Joseph Arthur Calixte Éthier | Liberal | 1896 |
| Vaudreuil | Gustave Benjamin Boyer | Liberal | 1904 |
| Wright | Emmanuel Berchmans Devlin | Liberal | 1904 |
| Yamaska | Albéric Archie Mondou | Conservative | 1911 |

### Saskatchewan

| Electoral district | Name | Party | First elected/previously elected |
| Assiniboia | John Gillanders Turriff | Liberal | 1904 |
| Battleford | Albert Champagne | Liberal | 1908 |
| Humboldt | David Bradley Neely | Liberal | 1908 |
| Mackenzie | Edward L. Cash | Liberal | 1904 |
| Moose Jaw | William Erskine Knowles | Liberal | 1908 |
| Prince Albert | James McKay (until 16 December 1914 judicial appointment) | Conservative | 1911 |
| Prince Albert | Samuel James Donaldson (by-election of 1 February 1915) | Conservative | 1915 |
| Qu'Appelle | Levi Thomson | Liberal | 1911 |
| Regina | William Melville Martin | Liberal | 1908 |
| Saltcoats | Thomas MacNutt | Liberal | 1908 |
| Saskatoon | George Ewan McCraney | Liberal | 1908 |

### Yukon

| Electoral district | Electoral district | Name | Party | First elected/previously elected |
| Yukon | | Alfred Thompson | Conservative | 1904, 1911 |

## By-elections

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