# By-elections to the 9th Canadian Parliament

By-elections to the 9th Canadian Parliament were held to elect members of the House of Commons of Canada between the 1900 federal election and the 1904 federal election. The Liberal Party of Canada led a majority government for the 9th 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.
| By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained |
| Guysborough | March 16, 1904 | Duncan Cameron Fraser | Liberal | John Howard Sinclair | Liberal | Appointed to Supreme Court of Nova Scotia | Yes |
| Gaspé | February 20, 1904 | Rodolphe Lemieux | Liberal | Rodolphe Lemieux | Liberal | Recontested upon appointment as Solicitor-General | Yes |
| Lambton East | February 16, 1904 | Oliver Simmons | Conservative | Joseph Elijah Armstrong | Conservative | Death | Yes |
| St. Hyacinthe | February 16, 1904 | Michel Esdras Bernier | Liberal | Jean Baptiste Blanchet | Liberal | Appointed a Railway Commissioner | Yes |
| City of St. John | February 16, 1904 | Andrew George Blair | Liberal | John Waterhouse Daniel | Conservative | Appointed head of the Board of Railway Commissioners | No |
| Bruce East | February 16, 1904 | Henry Cargill | Conservative | James J. Donnelly | Conservative | Death | Yes |
| St. James | February 16, 1904 | Joseph Brunet | Liberal | Honoré Hippolyte Achille Gervais | Liberal | Election declared void | Yes |
| West Queen's | February 16, 1904 | Donald Farquharson | Liberal | Horace Haszard | Liberal | Death | Yes |
| Montmagny | February 16, 1904 | Pierre-Raymond-Léonard Martineau | Liberal | Armand Lavergne | Liberal | Death | Yes |
| Hochelaga | February 16, 1904 | Joseph Alexandre Camille Madore | Liberal | Louis-Alfred-Adhémar Rivet | Liberal | Appointed Puisne Judge of the Supreme Court of Quebec | Yes |
| Kamouraska | February 12, 1904 | Henry George Carroll | Liberal | Ernest Lapointe | Liberal | Appointed a judge | Yes |
| Rouville | January 30, 1904 | Louis-Philippe Brodeur | Liberal | Louis-Philippe Brodeur | Liberal | Recontested upon appointment as Minister of Inland Revenue | Yes |
| Westmorland | January 30, 1904 | Henry Emmerson | Liberal | Henry Emmerson | Liberal | Recontested upon appointment as Minister of Railways and Canals | Yes |
| Russell | April 20, 1903 | William C. Edwards | Liberal | David Wardrope Wallace | Liberal | Called to Senate | Yes |
| Ontario North | March 10, 1903 | Angus McLeod | Liberal-Conservative | George Davidson Grant | Liberal | Death | No |
| Maskinongé | March 3, 1903 | Joseph-Hormisdas Legris | Liberal | Hormidas Mayrand | Liberal | Called to Senate | Yes |
| Terrebonne | February 24, 1903 | Raymond Préfontaine | Liberal | Samuel Desjardins | Liberal | Recontested upon ministerial appointment. Préfontaine was elected in two ridings simultaneously and chose to stand for re-election in Maisonneuve | Yes |
| Two Mountains | February 24, 1903 | Joseph Arthur Calixte Éthier | Liberal | Joseph Arthur Calixte Éthier | Liberal | Election declared void | Yes |
| Grey North | February 24, 1903 | Edward Henry Horsey | Liberal | Thomas Inkerman Thomson | Conservative | Death | No |
| Burrard | February 4, 1903 | George Ritchie Maxwell | Liberal | Robert George Macpherson | Liberal | Death | Yes |
| Maisonneuve | December 9, 1902 | Raymond Préfontaine | Liberal | Raymond Préfontaine | Liberal | Recontested upon appointment as Minister of Marine and Fisheries | Yes |
| Argenteuil | December 3, 1902 | Thomas Christie | Liberal | Thomas Christie, Jr. | Liberal | Death | Yes |
| Yarmouth | December 3, 1902 | Thomas Barnard Flint | Liberal | Bowman Brown Law | Liberal | Appointed Clerk of the House of Commons | Yes |
| Yukon | December 2, 1902 | New Seat | | James Hamilton Ross | Liberal | Newly created electoral district under The Yukon Territory Representation Act 1902 | N.A. |
| Beauharnois | March 26, 1902 | George di Madeiros Loy | Liberal | George di Madeiros Loy | Liberal | Election declared void | Yes |
| Kamouraska | February 28, 1902 | Henry George Carroll | Liberal | Henry George Carroll | Liberal | Recontested upon appointment as Solicitor General | Yes |
| Lisgar | February 18, 1902 | Robert Lorne Richardson | Independent | Duncan Alexander Stewart | Liberal | Election declared void | No |
| Quebec West | January 29, 1902 | Richard Reid Dobell | Liberal | William Power | Liberal | Death | Yes |
| Oxford North | January 29, 1902 | James Sutherland | Liberal | James Sutherland | Liberal | Recontested upon appointment as Minister of Marine and Fisheries | Yes |
| Victoria | January 28, 1902 | Edward Gawler Prior | Conservative | George Riley | Liberal | Election declared void | No |
| Laval | January 15, 1902 | Thomas Fortin | Liberal | Joseph-Édouard-Émile Léonard | Conservative | Appointed a judge of the Superior Court of Quebec | No |
| Addington | January 15, 1902 | John William Bell | Conservative | Melzar Avery | Conservative | Death | Yes |
| Durham West | January 15, 1902 | Charles Jonas Thornton | Liberal | Robert Beith | Conservative | Election declared void. | No |
| St. James | January 15, 1902 | Odilon Desmarais | Liberal | Joseph-Édouard-Émile Léonard | Liberal | Appointed a judge of the Superior Court of Quebec | Yes |
| York West | January 15, 1902 | Nathaniel Clarke Wallace | Conservative | Archibald Campbell | Liberal | Death | No |
| L'Islet | January 15, 1902 | Arthur Miville Déchêne | Liberal | Onésiphore Carbonneau | Liberal | Called to the Senate | Yes |
| West Queen's | January 15, 1902 | Louis Henry Davies | Liberal | Donald Farquharson | Liberal | Appointed a justice of the Supreme Court of Canada | Yes |
| Kingston | January 15, 1902 | Byron Moffatt Britton | Liberal | William Harty | Liberal | Appointed a judge of the Court of King's Bench for Ontario | Yes |
| Hastings West | January 15, 1902 | Henry Corby | Conservative | Edward Guss Porter | Conservative | Resignation | Yes |
| Beauce | January 8, 1902 | Joseph Godbout | Liberal | Henri Sévérin Béland | Liberal | Called to the Senate | Yes |
| York | December 28, 1901 | Alexander Gibson | Liberal | Alexander Gibson | Liberal | Election declared void | Yes |
| East Queen's | March 20, 1901 | Donald Alexander MacKinnon | Liberal | Donald Alexander MacKinnon | Liberal | Election declared void | Yes |
| Bruce North | March 20, 1901 | Alexander McNeill | Liberal-Conservative | James Halliday | Conservative | Election declared void | Yes |