10th Canadian Parliament By-elections By-elections

| By_election | Date_ | Incumbent | Party_3 | Winner | Party_5 | Cause | Retained_ |
|---|---|---|---|---|---|---|---|
| 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 |