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| Year | Name | Direction | From/To | Category |
|---|---|---|---|---|
| 1873 | Newton LeGayet MacKay | Lost | to Liberal | Changed Beliefs |
| 1874 | Samuel McDonnell | Lost | to Liberal | Changed Beliefs |
| 1879 | Chauveau, Flynn, Fortin, Pâquet, Racicot | Gained | from Quebec Liberal | Switched Sides |
| 1887 | Guillaume Amyot | Lost | to Nationalist | Stood on Principle |
| 1893 | Dalton McCarthy | Lost | to Independent | Stood on Principle |
| 1893 | Joseph-Israël Tarte | Lost | to Liberal | Fought Their Leader |
| 1896 | James Domville | Lost | to Liberal | Switched Sides |
| 1911 | Louis-Joseph Papineau | Gained | from Liberal | Switched Sides |
| 1917 | Honoré Achim | Lost | to Laurier-Liberal | War & Conscription |
| 1935 | Ernest Edward Perley | Gained | from Liberal | Changed Beliefs |
| 1935 | Henry Herbert Stevens | Lost | to Reconstruction Party | Started New Party |
| 2004 | Anne Cools | Gained | from Liberal | Changed Beliefs |
| 2004 | John Bryden | Gained | from Liberal | Changed Beliefs |
| 2004 | Chuck Cadman | Lost | to Independent | Kicked Out |
| 2005 | Belinda Stronach | Lost | to Liberal | Wanted Promotion |
| 2006 | David Emerson | Gained | from Liberal | Wanted Promotion |
| 2007 | Joe Comuzzi | Gained | from Liberal | Stood on Principle |
| 2007 | Garth Turner | Lost | to Liberal | Kicked Out |
| 2007 | Bill Casey | Lost | to Independent | Stood on Principle |
| 2007 | Wajid Khan | Gained | from Liberal | Wanted Promotion |
| 2013 | Dean Del Mastro | Lost | to Independent | Kicked Out |
| 2013 | Brent Rathgeber | Lost | to Independent | Stood on Principle |
| 2015 | Eve Adams | Lost | to Liberal | Switched Sides |
| 2018 | Maxime Bernier | Lost | to People's Party | Started New Party |
| 2018 | Leona Alleslev | Gained | from Liberal | Changed Beliefs |
| 2025 | Chris d'Entremont | Lost | to Liberal | Joined Government |
| 2025 | Michael Ma | Lost | to Liberal | Joined Government |
| 2026 | Matt Jeneroux | Lost | to Liberal | Joined Government |
| 2026 | Marilyn Gladu | Lost | to Liberal | Joined Government |