10th Canadian Parliament By-elections By-elections

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