10th Canadian Parliament By-elections By-elections

| By_election | Date_ | Incumbent | Party_3 | Winner | Party_5 | Cause | Retained_ |
|---|---|---|---|---|---|---|---|
| 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 | Peter Douglas McLean | 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 |