# List of by-elections in the Province of Canada

The list of by-elections in the Province of Canada includes every by-election held in the Province of Canada from its creation in 1841 until Confederation in 1867. By-elections occurred whenever there was a vacancy in the Legislative Assembly. The Legislative Council was made an elective body in 1856 and by-elections occurred there as well. Due to the fluid nature of party allegiances during this time no attempt has been made to show them in this list.

## Causes

A by-election occurs whenever there was a vacancy in the legislature. Vacancies occurred for the following reasons:
* Death of a member.
* Resignation of a member.
* Voided results
* Expulsion from the legislature.
* Ineligibility to sit.
* Appointment to the Legislative Council, the appointed upper house, which was made elective in 1856.
* Ministerial by-elections occurred when incumbent members recontested their seats upon being appointed to the Executive Council. In 1853 this requirement was amended to exempt Executive Councillors who resigned their offices and within a month accepted a new office. Solicitors General were not exempted if they switched to the Attorney Generalship. In 1855 this exception was dropped. In 1857 this requirement was extended to include Legislative Councillors.

## 8th Parliament of the Province of Canada 1863–1867

| By-election | Date | Incumbent | Winner | Cause |
| Oxford North | July 14, 1866 | Hope Fleming Mackenzie | Thomas Oliver | Death |
| Wentworth North | November 1, 1865 | William Notman | James McMonies | Death |
| Hamilton | February 21, 1865 | Isaac Buchanan | Charles Magill | Resignation |
| Ontario South | January 18, 1865 | Oliver Mowat | Thomas Nicholson Gibbs | Appointed a judge |
| Trois-Rivières | January 16, 1865 | Joseph-Édouard Turcotte | Louis-Charles Boucher de Niverville | Death |
| Chicoutimi and Saguenay | January 3, 1865 | David Edward Price | Pierre-Alexis Tremblay | Resignation to run for the Legislative Council |
| York West | December 14, 1864 | William Pearce Howland | William Pearce Howland | Sought re-election upon appointment as Postmaster General |
| Lanark North | November 4, 1864 | Robert Bell | William McDougall | Resignation to provide a seat for McDougall |
| Peterborough | September 14, 1864 | Wilson Seymour Conger | Frederick W. Haultain | Death |
| Niagara | September 7, 1864 | John Simpson | Angus Morrison | Appointed Assistant Auditor of Public Accounts |
| Jacques-Cartier | August 26, 1864 | François-Zéphirin Tassé | Guillaume Gamelin Gaucher | Appointed Inspector of Prisons |
| Ontario North | July 30, 1864 | William McDougall | Matthew Crooks Cameron | Sought re-election upon appointment as Provincial Secretary and Registrar |
| Ontario South | July 18, 1864 | Oliver Mowat | Oliver Mowat | Sought re-election upon appointment as Postmaster General |
| Oxford South | July 11, 1864 | George Brown | George Brown | Sought re-election upon appointment as President of the Executive Council |
| Hamilton | April 29, 1864 | Isaac Buchanan | Isaac Buchanan | Sought re-election upon appointment as President of the Executive Council |
| Waterloo North | April 26, 1864 | Michael Hamilton Foley | Isaac Erb Bowman | Sought re-election upon appointment as Postmaster General |
| Northumberland West | April 23, 1864 | James Cockburn | James Cockburn | Sought re-election upon appointment as Solicitor General for Upper Canada |
| Kamouraska | April 14, 1864 | Jean-Charles Chapais | Jean-Charles Chapais | Sought re-election upon appointment as Commissioner of Public Works |
| Sherbrooke | April 11, 1864 | Alexander Tilloch Galt | Alexander Tilloch Galt | Sought re-election upon appointment as Minister of Finance |
| Niagara | April 11, 1864 | John Simpson | John Simpson | Sought re-election upon appointment as Provincial Secretary and Registrar |
| Montreal West | April 11, 1864 | Thomas D'Arcy McGee | Thomas D'Arcy McGee | Sought re-election upon appointment as Minister of Agriculture |
| Montreal East | April 11, 1864 | George-Étienne Cartier | George-Étienne Cartier | Sought re-election upon appointment as Attorney General for Lower Canada |
| Kingston | April 11, 1864 | John A. Macdonald | John A. Macdonald | Sought re-election upon appointment as Attorney General for Upper Canada |
| Dorchester | April 11, 1864 | Hector-Louis Langevin | Hector-Louis Langevin | Sought re-election upon appointment as Solicitor General for Lower Canada |
| Leeds South | January 30, 1864 | Albert Norton Richards | David Ford Jones | Sought re-election upon appointment as Solicitor General for Upper Canada |
| St. Hyacinthe | October 1, 1863 | Louis-Victor Sicotte | Rémi Raymond | Appointed a judge |
| Bagot | August 15, 1863 | Maurice Laframboise | Maurice Laframboise | Sought re-election upon appointment as Commissioner of Public Works |

## 7th Parliament of the Province of Canada 1861–1863

| By-election | Date | Incumbent | Winner | Cause |
| Essex | April 7, 1863 | Arthur Rankin | John O'Connor | Void Election |
| Laprairie | April 1, 1863 | Thomas-Jean-Jacques Loranger | Alfred Pinsonneault | Appointed a judge |
| Oxford South | March 19, 1863 | George Skeffington Connor | George Brown | Appointed a judge |
| Napierville | November 17, 1862 | Jacques-Olivier Bureau | Pierre Benoît | Resignation to run for the Legislative Council |
| Perth | July 3, 1862 | Michael Hamilton Foley | Thomas Mayne Daly | Elected in two seats and re-elected at ministerial by-election in Waterloo North |
| Hochelaga | June 20, 1862 | Paschal Falkner | Antoine-Aimé Dorion | Resignation to provide a seat for Dorion |
| Oxford North | June 14, 1862 | William McDougall | William McDougall | Sought re-election upon appointment as Commissioner of Crown Lands |
| Cornwall | June 14, 1862 | John Sandfield Macdonald | John Sandfield Macdonald | Sought re-election upon appointment as Attorney General for Upper Canada |
| York North | June 13, 1862 | Adam Wilson | Adam Wilson | Sought re-election upon appointment as Solicitor General for Upper Canada |
| York West | June 12, 1862 | William Pearce Howland | William Pearce Howland | Sought re-election upon appointment as Minister of Finance |
| St. Hyacinthe | June 12, 1862 | Louis-Victor Sicotte | Louis-Victor Sicotte | Sought re-election upon appointment as Attorney General for Lower Canada |
| Argenteuil | June 12, 1862 | John Abbott | John Abbott | Sought re-election upon appointment as Solicitor General for Lower Canada |
| Waterloo North | June 9, 1862 | Michael Hamilton Foley | Michael Hamilton Foley | Sought re-election upon appointment as Postmaster General |
| Quebec County | June 9, 1862 | François Évanturel | François Évanturel | Sought re-election upon appointment as Minister of Agriculture |
| Montreal West | June 5, 1862 | Thomas D'Arcy McGee | Thomas D'Arcy McGee | Sought re-election upon appointment as President of the Executive Council |
| Toronto West | April 22, 1862 | John Beverley Robinson | John Beverley Robinson | Sought re-election upon appointment as President of the Executive Council |
| London | April 7, 1862 | John Carling | John Carling | Sought re-election upon appointment as Receiver General |
| Brome | March 17, 1862 | Moses Sweet | Christopher Dunkin | Appointed Postmaster of Warden |
| Montcalm | February 20, 1862 | Jean-Louis Martin | Joseph Dufresne | Death |
| Laval | September 27, 1861 | Pierre Labelle | Louis-Siméon Morin | Appointed Inspector of Public Works |

## 6th Parliament of the Province of Canada 1858–1861

| By-election | Date | Incumbent | Winner | Cause |
| Grey | March 4, 1861 | John Sheridan Hogan | Jesse Thomas Purdy | Death |
| Vaudreuil | November 26, 1860 | Robert Unwin Harwood | Jean-Baptiste Mongenais | Resignation to run for the Legislative Council |
| Shefford | November 20, 1860 | Asa Belknap Foster | Vacant, no return made due to tie between Lucius Seth Huntington and Michel-Adrien Bessette. Assembly dissolved before the results could be decided. | Resignation to run for the Legislative Council |
| Lambton | November 19, 1860 | Malcolm Cameron | Hope Fleming Mackenzie | Resignation to run for the Legislative Council |
| Lincoln | November 7, 1860 | William Hamilton Merritt | John Charles Rykert | Resignation to run for the Legislative Council |
| Lanark North | October 26, 1860 | Robert Bell | Robert Bell | Resignation to run for the Legislative Council |
| Middlesex East | May 31, 1860 | Marcus Talbot | Robert Craik | Death |
| Quebec East* | May 18, 1860 | Hippolyte Dubord | Pierre-Gabriel Huot | Void Election |
| Quebec West* | May 7, 1860 | Charles Joseph Alleyn | Charles Joseph Alleyn | Void Election |
| Quebec Centre* | May 7, 1860 | Georges-Honoré Simard | Georges-Honoré Simard | Void Election |
| Terrebonne | February 21, 1860 | Louis-Siméon Morin | Louis-Siméon Morin | Sought re-election upon appointment as Solicitor General for Lower Canada |
| York North | January 14, 1860 | Joseph Hartman | Adam Wilson | Death |
| Russell | December 21, 1859 | G. B. Lyon-Fellowes | John Loux | Resignation due to election fraud |
| Wellington North | February 23, 1859 | Charles Allan | James Ross | Death |
| Maskinongé | December 14, 1858 | Louis-Honoré Gauvreau | George Caron | Death |
| Brant East | December 1, 1858 | David Christie | Hugh Finlayson | Resignation to run for the Legislative Council |
| Haldimand | October 7, 1858 | William Lyon Mackenzie | Michael Harcourt | Resignation |
| Lotbinière | October 2, 1858 | John O'Farrell | Lewis Thomas Drummond | Void Election |
| Shefford | September 14, 1858 | Lewis Thomas Drummond | Asa Belknap Foster | Sought re-election upon appointment as Attorney General for Lower Canada** |
| Portneuf | September 11, 1858 | Joseph-Élie Thibaudeau | Joseph-Élie Thibaudeau | Sought re-election upon appointment as President of the Executive Council and Minister of Agriculture** |
| Montreal | September 9, 1858 | Antoine-Aimé Dorion | Antoine-Aimé Dorion | Sought re-election upon appointment as Commissioner of Crown Lands** |
| Oxford South | September 7, 1858 | George Skeffington Connor | George Skeffington Connor | Sought re-election upon appointment as Solicitor General for Upper Canada** |
| Iberville | September 6, 1858 | Charles Laberge | Charles Laberge | Sought re-election upon appointment as Solicitor General for Lower Canada** |
| Ontario South | September 4, 1858 | Oliver Mowat | Oliver Mowat | Sought re-election upon appointment as Provincial Secretary and Registrar** |
| Brockville | September 2, 1858 | George Sherwood | George Sherwood | Sought re-election upon appointment as Receiver General |
| Toronto | September 1, 1858 | George Brown | George Brown | Sought re-election upon appointment as Inspector General** |
| Cornwall | September 1, 1858 | John Sandfield Macdonald | John Sandfield Macdonald | Sought re-election upon appointment as Attorney General for Upper Canada** |
| Lévis | August 28, 1858 | François-Xavier Lemieux | François-Xavier Lemieux | Sought re-election upon appointment as Receiver General** |
| Waterloo North | August 23, 1858 | Michael Hamilton Foley | Michael Hamilton Foley | Sought re-election upon appointment as Postmaster General** |
| Sherbrooke | August 23, 1858 | Alexander Tilloch Galt | Alexander Tilloch Galt | Sought re-election upon appointment as Inspector General |
| Wellington North | August 21, 1858 | Charles Allan | Charles Allan | Void Election |
| Middlesex West | August 5, 1858 | John Scatcherd | Angus Peter McDonald | Death |
| Leeds North and Grenville North | May 21, 1858 | Basil R. Church | Ogle Robert Gowan | Death |
| Oxford North | May 14, 1858 | George Brown | William McDougall | Chose to sit for Toronto |
| Renfrew | March 3, 1858 | John Lorn McDougall | William Cayley | Appointed Associate Coroner for the United Counties of Lanark and Renfrew |
| Northumberland West | February 22, 1858 | Sidney Smith | Sidney Smith | Sought re-election upon appointment as Postmaster General |
* Incumbents sat for Quebec City which was a three-member seat until 1860 when it was split into Centre, East and West districts. As a result, the by-elections were held for the new single-member seats
** Members of the Brown-Dorion Ministry of August 2–4, 1858

## 5th Parliament of the Province of Canada 1854–1857

| By-election | Date | Incumbent | Winner | Cause |
| Terrebonne | June 23, 1857 | Gédéon-Mélasippe Prévost | Louis-Siméon Morin | Resignation to provide a seat for Morin |
| Quebec City | April 14, 1857 | Jean Blanchet | George Okill Stuart | Resignation (ill health) |
| Rimouski | February 17, 1857 | Joseph-Charles Taché | Michel Guillaume Baby | Resignation |
| Quebec City | October 27, 1856 | Jean Chabot | Georges-Honoré Simard | Appointed a judge |
| Hastings North | October 27, 1856 | Edmund Murney | George Benjamin | Resignation to run for the Legislative Council |
| Rouville | October 4, 1856 | Joseph-Napoléon Poulin | William Henry Chaffers | Resignation to run for the Legislative Council |
| Niagara | June 20, 1856 | Joseph Curran Morrison | Joseph Curran Morrison | Sought re-election upon appointment as Receiver General |
| Stanstead | June 10, 1856 | Timothy Lee Terrill | Timothy Lee Terrill | Sought re-election upon appointment as Provincial Secretary and Registrar |
| Argenteuil | May 12, 1856 | Sydney Robert Bellingham | Sydney Robert Bellingham | Void Election |
| Renfrew | March 31, 1856 | Francis Hincks | John Supple | Resignation |
| Peterborough | January 26, 1856 | John Langton | Wilson Seymour Conger | Appointed Auditor of Public Accounts |
| Quebec County | August 7, 1855 | Pierre-Joseph-Olivier Chauveau | François Évanturel | Appointed Superintendent of the Board of Education |
| Chicoutimi and Tadoussac | April 26, 1855 | Augustin-Norbert Morin | David Edward Price | Appointed a judge |
| Verchères | February 28, 1855 | George-Étienne Cartier | George-Étienne Cartier | Sought re-election upon appointment as Provincial Secretary and Registrar |
| Montmorency | February 12, 1855 | Joseph-Édouard Cauchon | Joseph-Édouard Cauchon | Sought re-election upon appointment as Commissioner of Crown Lands |
| Lévis | February 10, 1855 | François-Xavier Lemieux | François-Xavier Lemieux | Sought re-election upon appointment as Chief Commissioner of Public Works |
| Kamouraska | January 30, 1855 | Jean-Charles Chapais | Jean-Charles Chapais | Void Election |
| Saguenay | January 8, 1855 | Pierre-Gabriel Huot | Pierre-Gabriel Huot | Void Election |
| Argenteuil | January 5, 1855 | Sydney Robert Bellingham | Sydney Robert Bellingham | Void Election |
| Bagot | October 20, 1854 | Timothée Brodeur | Timothée Brodeur | Void Election |
| Bellechasse | October 17, 1854 | Jean Chabot | Octave-Cyrille Fortier | Chose to sit for Quebec City |
| Wentworth North | October 13, 1854 | Robert Spence | Robert Spence | Sought re-election upon appointment as Postmaster General |
| Oxford South | October 9, 1854 | Francis Hincks | Ephraim Cook | Chose to sit for Renfrew |
| Huron-Bruce | October 4, 1854 | William Cayley | William Cayley | Sought re-election upon appointment as Inspector General |
| Hamilton | October 2, 1854 | Allan MacNab | Allan MacNab | Sought re-election upon appointment as President of the Executive Council and Minister of Agriculture |
| Kingston | September 28, 1854 | John A. Macdonald | John A. Macdonald | Sought re-election upon appointment as Attorney General of Upper Canada |
| Frontenac | September 28, 1854 | Henry Smith | Henry Smith | Sought re-election upon appointment as Solicitor General of Upper Canada |

## 4th Parliament of the Province of Canada 1851–1854

| By-election | Date | Incumbent | Winner | Cause |
| Leeds | July 30, 1853 | William Buell Richards | Jesse Delong | Appointed a judge |
| Niagara | July 13, 1853 | Joseph Curran Morrison | Joseph Curran Morrison | Sought re-election upon appointment as Solicitor General of Upper Canada |
| Toronto | April 28, 1853 | William Henry Boulton | Henry Sherwood | Void Election |
| Sherbrooke City | March 8, 1853 | Edward Short | Alexander Tilloch Galt | Appointed a judge |
| Stanstead | November 23, 1852 | Hazard Bailey Terrill | Timothy Lee Terrill | Death |
| Bellechasse | October 4, 1852 | Jean Chabot | Jean Chabot | Sought re-election upon appointment as Chief Commissioner of Public Works |
| Niagara | September 25, 1852 | Francis Hincks | Joseph Curran Morrison | Chose to sit for Oxford |
| Deux-Montagnes | July 9, 1852 | William Henry Scott | Louis-Joseph Papineau | Death |
| Huron | May 12, 1852 | Malcolm Cameron | Malcolm Cameron | Sought re-election upon accepting appointment as President of the Executive Council |

## 3rd Parliament of the Province of Canada 1848–1851

| By-election | Date | Incumbent | Winner | Cause |
| Haldimand | April 21, 1851 | David Thompson | William Lyon Mackenzie | Death |
| Kamouraska | February 1, 1851 | Pierre Canac | Luc Letellier de St-Just | Death |
| Lincoln | May 4, 1850 | William Hamilton Merritt | William Hamilton Merritt | Sought re-election upon appointment as Chief Commissioner of Public Works |
| Mégantic | May 1, 1850 | Dominick Daly | Dunbar Ross | Appointed to a Commission Inquiring into the Condition and Claims of the New and Waltham forests |
| Halton | March 18, 1850 | John Wetenhall | Calen Hopkins | Sought re-election upon appointment as Assistant Commissioner of Public Works |
| Sherbrooke County | March 9, 1850 | Alexander Tilloch Galt | John Sewell Sanborn | Resignation |
| Quebec City | January 29, 1850 | Jean Chabot | Jean Chabot | Sought re-election upon appointment as Chief Commissioner of Public Works |
| London | January 21, 1850 | John Wilson | John Wilson | Sought re-election in opposition to the Montreal Annexation Manifesto |
| Glengarry | January 11, 1850 | John Sandfield Macdonald | John Sandfield Macdonald | Sought re-election upon appointment as Solicitor General for Upper Canada |
| York East | December 4, 1849 | William Hume Blake | Peter Perry | Appointed a judge |
| Chambly | September 25, 1849 | Pierre Beaubien | Louis Lacoste | Appointed Medical Superintendent at the Montreal prison |
| Sherbrooke County | April 17, 1849 | Samuel Brooks | Alexander Tilloch Galt | Death |
| Lincoln | October 6, 1848 | William Hamilton Merritt | William Hamilton Merritt | Sought re-election upon appointment as President of the Executive Council |
| Saguenay | September 5, 1848 | Marc-Pascal de Sales Laterrière | Marc-Pascal de Sales Laterrière | Vacated seat on appointment as Deputy Adjutant-General of the Militia. Re-elected after resigning office. |
| Shefford | July 11, 1848 | Lewis Thomas Drummond | Lewis Thomas Drummond | Sought re-election upon appointment as Solicitor General for Lower Canada |
| York East | July 5, 1848 | William Hume Blake | William Hume Blake | Sought re-election upon appointment as Solicitor General for Upper Canada |
| Quebec City | June 9, 1848 | Thomas Cushing Aylwin | François-Xavier Méthot | Appointed a judge |
| Oxford | April 28, 1848 | Francis Hincks | Francis Hincks | Sought re-election upon appointment as Inspector General |
| Trois-Rivières | April 26, 1848 | Vacant | Antoine Polette | No return made at general election |
| Terrebonne | April 14, 1848 | Louis-Hippolyte Lafontaine | Louis-Michel Viger | Elected in two seats and re-elected in ministerial by-election for Montreal City |
| Kent | April 10, 1848 | Malcolm Cameron | Malcolm Cameron | Sought re-election upon appointment as Assistant Commissioner of Public Works |
| Verchères | April 7, 1848 | James Leslie | George-Étienne Cartier | Vacated seat on appointment as President of the Executive Council and was later appointed to the Legislative Council |
| York North | April 1, 1848 | Robert Baldwin | Robert Baldwin | Sought re-election upon appointment as Attorney General for Upper Canada |
| York South | March 31, 1848 | James Hervey Price | James Hervey Price | Sought re-election upon appointment as Commissioner of Crown Lands |
| Quebec City | March 28, 1848 | Thomas Cushing Aylwin | Thomas Cushing Aylwin | Sought re-election upon appointment as Solicitor General for Lower Canada |
| Montreal City | March 28, 1848 | Louis-Hippolyte Lafontaine | Louis-Hippolyte Lafontaine | Sought re-election upon appointment as Attorney General for Lower Canada |

## 2nd Parliament of the Province of Canada 1844–1847

| By-election | Date | Incumbent | Winner | Cause |
| Dorchester | July 12, 1847 | Joseph-André Taschereau | François-Xavier Lemieux | Appointed a judge |
| London | July 3, 1847 | William Henry Draper | John Wilson | Appointed a judge |
| Toronto | June 10, 1847 | Henry Sherwood | Henry Sherwood | Sought re-election upon appointment as Attorney General for Upper Canada |
| Missisquoi | June 10, 1847 | James Smith | William Badgley | Appointed a judge |
| Kingston | June 1, 1847 | John A. Macdonald | John A. Macdonald | Sought re-election upon appointment as Receiver General |
| L'Islet | May 6, 1847 | Étienne-Paschal Taché | Charles-François Fournier | Appointed Deputy Adjutant-General of the Militia |
| Cornwall | August 17, 1846 | Rolland Macdonald | John Hillyard Cameron | Resignation to provide a seat for Cameron |
| Simcoe | July 27, 1846 | William Benjamin Robinson | William Benjamin Robinson | Sought re-election upon appointment as Chief Commissioner of Public Works |
| Prince Edward | July 1, 1846 | John Philip Roblin | Roger B. Conger | Appointed Collector of Customs |
| Carleton | June 23, 1846 | James Johnston | George Lyon | Sought re-election in opposition to the Ministry |
| Huron | February 28, 1846 | William Dunlop | William Cayley | Appointed Superintendent of the Lachine Canal |
| Dorchester | September 15, 1845 | Pierre-Elzéar Taschereau | Joseph-André Taschereau | Death |
| Trois-Rivières | July 14, 1845 | Edward Greive | Denis-Benjamin Viger | Death |
| Lanark | February 28, 1845 | Malcolm Cameron | Malcolm Cameron | Void Election |
| London | February 13, 1845 | Lawrence Lawrason | William Henry Draper | Resignation to provide a seat for Draper |
| Kent | February 7, 1845 | Samuel Harrison | Joseph Woods | Appointed a judge |
| Saguenay | January 14, 1845 | Augustin-Norbert Morin | Marc-Pascal de Sales Laterrière | Chose to sit for Bellechasse |
| Simcoe | January 13, 1845 | William Benjamin Robinson | William Benjamin Robinson | Sought re-election upon appointment as Inspector General |

## 1st Parliament of the Province of Canada 1841–1844

| By-election | Date | Incumbent | Winner | Cause |
| Montreal City | April 17, 1844 | Benjamin Holmes | Lewis Thomas Drummond | Resignation |
| London | January 1844 | Hamilton Hartley Killaly | Lawrence Lawrason | Resignation due to his office becoming ineligible with membership of the Legislature |
| Montreal City | November 22, 1843 | George Moffatt | Pierre Beaubien | Resignation in protest of moving the capital from Kingston to Montreal |
| Hastings | November 4, 1843 | Vacant | Edmund Murney | No by-election held in 1842 due to riots |
| Montreal County | October 26, 1843 | Alexandre-Maurice Delisle | André Jobin | Appointed Clerk of the Crown |
| Chambly | October 23, 1843 | John Yule | Louis Lacoste | Resignation |
| Rouville | September 25, 1843 | William Walker | Timothée Franchère | Resignation |
| Champlain | September 22, 1843 | René-Joseph Kimber | Henry Judah | Appointed to the Legislative Council |
| Quebec City | September 18, 1843 | David Burnet | Jean Chabot | Resignation (became bankrupt) |
| Russell | September 14, 1843 | William Henry Draper | William Stewart | Appointed to the Legislative Council |
| Toronto | March 6, 1843 | Isaac Buchanan | Henry Sherwood | Resignation |
| Rimouski | January 30, 1843 | Michel Borne | Robert Baldwin | Resignation to provide a seat for Baldwin |
| Saguenay | November 28, 1842 | Étienne Parent | Augustin-Norbert Morin | Appointed Clerk of the Executive Council |
| 2nd Riding of York | November 22, 1842 | George Duggan | George Duggan | Void Election |
| Beauharnois | November 9, 1842 | John William Dunscomb | Edward Gibbon Wakefield | Appointed Warden of Trinity House |
| Portneuf | October 20, 1842 | Thomas Cushing Aylwin | Thomas Cushing Aylwin | Sought re-election upon appointment as Solicitor General for Lower Canada |
| Hastings | October 17, 1842 | Robert Baldwin | No Return due to riots | Sought re-election upon appointment as Attorney General for Upper Canada |
| 3rd Riding of York | October 15, 1842 | James Edward Small | James Edward Small | Sought re-election upon appointment as Solicitor General for Upper Canada |
| 4th Riding of York | October 8, 1842 | Louis Hippolyte LaFontaine | Louis Hippolyte LaFontaine | Sought re-election upon appointment as Attorney General for Lower Canada |
| London | September 28, 1842 | Hamilton Hartley Killaly | Hamilton Hartley Killaly | Sought re-election upon appointment as Chairman of the Board of Works |
| Ottawa County | August 17, 1842 | Charles Dewey Day | Denis-Benjamin Papineau | Appointed a judge |
| Leinster | August 8, 1842 | Jean-Moïse Raymond | Jacob De Witt | Appointed registrar |
| Saint-Maurice | July 8, 1842 | Joseph-Édouard Turcotte | Joseph-Édouard Turcotte | Sought re-election due to holding two government offices |
| Rouville | July 7, 1842 | Melchior-Alphonse d'Irumberry de Salaberry | William Walker | Appointed registrar |
| Oxford | July 6, 1842 | Francis Hincks | Francis Hincks | Sought re-election upon appointment as Inspector General |
| Bellechasse | June 6, 1842 | Augustin-Guillaume Ruel | Abraham Turgeon | Appointed registrar |
| Deux Montagnes | April 18, 1842 | Colin Robertson | Charles John Forbes | Death |
| Nicolet | February 15, 1842 | Augustin-Norbert Morin | Louis-Michel Viger | Resignation to be appointed a judge |
| Verchères | December 28, 1841 | Henri Desrivières | James Leslie | Resignation to provide a seat for Leslie |
| 4th Riding of York | September 21, 1841 | Robert Baldwin | Louis Hippolyte LaFontaine | Chose to sit for Hastings |
| Middlesex | July 10, 1841 | Thomas Parke | Thomas Parke | Sought re-election upon appointment as Surveyor General |
| Kingston | July 1, 1841 | Anthony Manahan | Samuel Harrison | Appointed Collector of Customs for Toronto |

## Legislative Council By-Elections 1856–1867

The Legislative Council became an elective body in 1856. By-elections were held to fill vacancies. In 1857 Legislative Councillors appointed to office were now required to seek re-election at Ministerial by-elections.
| By-election | Date | Incumbent | Winner | Cause |
| Brock | January 25, 1866 | Adam Johnston Fergusson Blair | Adam Johnston Fergusson Blair | Sought re-election upon appointment as President of the Executive Council |
| Stadacona | September 19, 1864 | François Baby | Jean-Élie Gingras | Death |
| La Durantaye | June 25, 1864 | François-Xavier Lemieux | Joseph-Noël Bossé | Death |
| Cataraqui | April 30, 1864 | Alexander Campbell | Alexander Campbell | Sought re-election upon appointment as Commissioner of Crown Lands |
| Rougemont | January 8, 1864 | Louis-Antoine Dessaulles | William Henry Chaffers | Appointed Clerk of the Crown and Peace |
| St. Clair | September 19, 1863 | John Wilson | Alexander Vidal | Appointed a judge |
| Newcastle | September 17, 1863 | Andrew Jeffrey | Asa Burnham | Death |
| Trent | July 21, 1863 | Sidney Smith | Billa Flint | Resignation to contest the 1863 general election |
| Victoria | June 19, 1863 | Luther Hamilton Holton | Thomas Ryan | Vacated seat on appointment as Minister of Finance and contested the 1863 general election |
| Grandville | June 5, 1863 | Luc Letellier de St-Just | Luc Letellier de St-Just | Sought re-election upon appointment as Minister of Agriculture |
| Rigaud | June 3, 1863 | Robert Unwin Harwood | Eustache Prud'homme | Death |
| St. Clair | May 16, 1863 | Malcolm Cameron | John Wilson | Appointed Queen's Printer |
| Wellington | May 8, 1863 | Hollis Smith | John Sewell Sanborn | Death |
| De Lanaudière | April 6, 1863 | Alexandre Bareil, dit Lajoie | Louis Auguste Olivier | Death |
| Brock | March 28, 1863 | Adam Johnston Fergusson Blair | Adam Johnston Fergusson Blair | Sought re-election upon appointment as Receiver General |
| De Lorimier | February 26, 1863 | Jacques-Olivier Bureau | Jacques-Olivier Bureau | Sought re-election upon appointment as Provincial Secretary and Registrar |
| Western | September 18, 1862 | Allan MacNab | Walter McCrea | Death |
| Niagara | September 4, 1862 | William Hamilton Merritt | James Currie | Death |
| Gulf | June 23, 1862 | Ulric-Joseph Tessier | Ulric-Joseph Tessier | Sought re-election upon appointment as Commissioner of Public Works |
| Saugeen | May 9, 1862 | James Patton | John McMurrich | Sought re-election upon appointment as Solicitor General for Upper Canada |
| Rideau | April 21, 1862 | Philip Michael Matthew Scott VanKoughnet | James Skead | Appointed a judge |
| Trent | September 28, 1861 | Edmund Murney | Sidney Smith | Death |
| Stadacona | June 17, 1861 | Pierre-Gabriel Huot | François Baby | Void Election |
| Montarville | June 17, 1861 | Alexandre-Édouard Kierzkowski | Louis Lacoste | Void Election |
| Western | November 24, 1860 | John Prince | Allan MacNab | Appointed a judge |
| Sorel | June 18, 1860 | Jean-Baptiste Guèvremont | Jean-Baptiste Guèvremont | Void Election |