10th Canadian Parliament By-elections By-elections

| By_election | Date_ | Incumbent | Party_3 | Winner | Party_5 | Cause | Retained_ |
|---|---|---|---|---|---|---|---|
| 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 Stockton | Conservative | William Pugsley | Liberal | Death | No |