# By-elections to the 10th Canadian Parliament

By-elections to the 10th Canadian Parliament were held to elect members of the House of Commons of Canada between the 1904 federal election and the 1908 federal election. The Liberal Party of Canada led a majority government for the 10th Canadian Parliament.
The list includes Ministerial by-elections which occurred due to the requirement that Members of Parliament recontest their seats upon being appointed to Cabinet. These by-elections were almost always uncontested. This requirement was abolished in 1931.
Alberta and Saskatchewan entered Confederation in 1905. Unlike in the case of other provinces that joined after 1867, the new provinces were already represented by ridings originally drawn for the Northwest Territories, and the members elected in 1904 continued to sit as representatives of the old NWT ridings (some of which straddled the new border), except where they resigned as indicated below.
| By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained |
| Stanstead | January 22, 1908 | Henry Lovell | Liberal | Charles Henry Lovell | Liberal | Death | Yes |
| Huron South | January 22, 1908 | Benjamin B. Gunn | Conservative | Murdo Young McLean | Liberal | Death | No |
| Nicolet | December 30, 1907 | Charles Ramsay Devlin | Liberal | Gustave-Adolphe-Narcisse Turcotte | Liberal | Resignation upon appointment to the provincial cabinet of Quebec | Yes |
| City of Ottawa | December 23, 1907 | Napoléon Antoine Belcourt | Liberal | William H. Hutchison | Liberal | Called to the Senate | Yes |
| Labelle | December 23, 1907 | Henri Bourassa | Liberal | Charles Beautron Major | Liberal | Resignation to enter provincial politics | Yes |
| York Centre | December 23, 1907 | Archibald Campbell | Liberal | Peter Douglas McLean | Liberal | Called to the Senate | Yes |
| Colchester | November 28, 1907 | Frederick Andrew Laurence | Liberal | John Stanfield | Conservative | Appointed a judge | No |
| London | October 29, 1907 | C. S. Hyman | Liberal | Thomas Beattie | Conservative | Resignation | No |
| Northumberland East | October 29, 1907 | Edward Cochrane | Conservative | Charles Lewis Owen | Conservative | Death | Yes |
| Wellington North | October 29, 1907 | Thomas Martin | Liberal | Alexander Munro Martin | Liberal | Death | Yes |
| Brockville | September 18, 1907 | Daniel Derbyshire | Liberal | George Perry Graham | Liberal | Called to the Senate | Yes |
| City and County of St. John | September 18, 1907 | Alfred Augustus Stockton | Conservative | William Pugsley | Liberal | Death | No |
| Richelieu | March 7, 1907 | Arthur-Aimé Bruneau | Liberal | Adélard Lanctôt | Liberal | Appointed a judge of the Superior Court of Quebec | Yes |
| L'Assomption | March 7, 1907 | Romuald-Charlemagne Laurier | Liberal | Ruben Charles Laurier | Liberal | Death | Yes |
| Victoria | March 5, 1907 | John Costigan | Liberal | Pius Michaud | Liberal | Called to the Senate | Yes |
| Three Rivers and St. Maurice | February 28, 1907 | Jacques Bureau | Liberal | Jacques Bureau | Liberal | Recontested upon appointment as Solicitor General | Yes |
| Nicolet | December 29, 1906 | Rodolphe Lemieux | Liberal | Charles Ramsay Devlin | Liberal | Chose to sit for Gaspé | Yes |
| St. Ann | November 21, 1906 | Daniel Gallery | Liberal | Joseph Charles Walsh | Liberal | Election declared void | Yes |
| St. Mary | November 21, 1906 | Camille Piché | Liberal | Médéric Martin | Liberal | Appointed Police Magistrate in Montreal. | Yes |
| Shelburne and Queen's | October 31, 1906 | William Stevens Fielding | Liberal | William Stevens Fielding | Liberal | Election declared void | Yes |
| Bruce North | October 30, 1906 | Leonard Thomas Bland | Liberal-Conservative | John Tolmie | Liberal | Death | No |
| Quebec County | October 23, 1906 | Charles Fitzpatrick | Liberal | Lorenzo Robitaille | Independent Liberal | Appointed Chief Justice of Canada | No |
| St. Johns—Iberville | October 16, 1906 | Louis Philippe Demers | Liberal | Marie Joseph Demers | Liberal | Appointed Puisne Judge of the Superior Court of Quebec | Yes |
| Elgin East | October 14, 1906 | Andrew B. Ingram | Liberal-Conservative | David Marshall | Conservative | Appointed Vice Chairman of the Ontario Railway and Municipal Commission | Yes |
| Renfrew North | October 9, 1906 | Peter White | Conservative | Gerald Verner White | Conservative | Death | Yes |
| Strathcona | April 5, 1906 | Peter Talbot | Liberal | Wilbert McIntyre | Liberal | Called to the Senate | Yes |
| Cape Breton North and Victoria | March 14, 1906 | Daniel Duncan McKenzie | Liberal | Alexander Charles Ross | Liberal | Appointed a judge | Yes |
| Victoria City | March 6, 1906 | George Riley | Liberal | William Templeman | Liberal | Resignation to provide a seat for Templeman | Yes |
| Maisonneuve | February 23, 1906 | Raymond Préfontaine | Liberal | Alphonse Verville | Labour | Death | No |
| Assiniboia West | February 6, 1906 | Thomas Walter Scott | Liberal | William Erskine Knowles | Liberal | Resignation to enter provincial politics in Saskatchewan | Yes |
| Saskatchewan | February 6, 1906 | John Henderson Lamont | Liberal | George Ewan McCraney | Liberal | Resignation to enter provincial politics in Saskatchewan | Yes |
| Town of Sherbrooke | February 6, 1906 | Arthur Norreys Worthington | Conservative | Arthur Norreys Worthington | Conservative | Election declared void | Yes |
| Compton | January 4, 1906 | Aylmer Byron Hunt | Liberal | Aylmer Byron Hunt | Liberal | Election declared void | Yes |
| York North | November 22, 1905 | William Mulock | Liberal | Allen Bristol Aylesworth | Liberal | Appointed a judge | Yes |
| Antigonish | November 22, 1905 | Colin McIsaac | Liberal | William Chisholm | Liberal | Appointed a Railway Commissioner | Yes |
| Lambton West | November 22, 1905 | Thomas George Johnston | Liberal | Frederick Forsyth Pardee | Liberal | Death | Yes |
| Wentworth | November 22, 1905 | E. D. Smith | Conservative | E. D. Smith | Conservative | Election declared void | Yes |
| London | June 13, 1905 | C. S. Hyman | Liberal | C. S. Hyman | Liberal | Recontested upon appointment as Minister of Public Works | Yes |
| Oxford North | June 13, 1905 | James Sutherland | Liberal | George Smith | Liberal | Death | Yes |
| Lévis | June 6, 1905 | Louis Julien Demers | Liberal | Louis Auguste Carrier | Liberal | Death | Yes |
| Edmonton | April 25, 1905 | Frank Oliver | Liberal | Frank Oliver | Liberal | Recontested upon appointment as Minister of the Interior. | Yes |
| Toronto Centre | April 11, 1905 | Edward Frederick Clarke | Conservative | Edmund James Bristol | Conservative | Death | Yes |
| Wright | February 13, 1905 | Wilfrid Laurier | Liberal | Emmanuel Berchmans Devlin | Liberal | Chose to sit for Quebec East | Yes |
| Carleton | February 4, 1905 | Edward Kidd | Conservative | Robert L. Borden | Conservative | Resignation to provide a seat for Borden | Yes |
| Quebec-Centre | January 19, 1905 | Arthur Cyrille Albert Malouin | Liberal | Arthur Lachance | Liberal | Appointed a judge of the Superior Court of Quebec | Yes |