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| Year | Name | Direction | From/To | Category |
|---|---|---|---|---|
| 1869 | Richard John Cartwright | Gained | from Liberal-Conservative | Wanted Promotion |
| 1917 | William Stevens Fielding | Lost | to Liberal-Unionist | War & Conscription |
| 1917 | Hugh Guthrie | Lost | to Unionist | War & Conscription |
| 1917 | Frank Broadstreet Carvell | Lost | to Liberal-Unionist | War & Conscription |
| 1917 | ~15 other Liberal MPs | Lost | to Unionist | War & Conscription |
| 1962 | Hazen Argue | Gained | from NDP | Lost Leadership Race |
| 1971 | Paul Hellyer | Lost | to Independent | Changed Beliefs |
| 1977 | Jack Horner | Gained | from Progressive Conservative | Wanted Promotion |
| 1996 | John Nunziata | Lost | to Independent | Stood on Principle |
| 2003 | Scott Brison | Gained | from Prog. Conservative | Party Merged |
| 2004 | Carolyn Parrish | Lost | to Independent | Kicked Out |
| 2005 | Belinda Stronach | Gained | from Conservative | Wanted Promotion |
| 2006 | David Emerson | Lost | to Conservative | Wanted Promotion |
| 2018 | Leona Alleslev | Lost | to Conservative | Changed Beliefs |
| 2020 | Amanda Simard | Gained | from Prog. Conservative | Stood on Principle |
| 2021 | Jenica Atwin | Gained | from Green Party | Party in Crisis |
| 2024 | Brendan Maguire | Lost | to Prog. Conservative | Wanted Promotion |
| 2025 | Michael Ma | Gained | from Conservative | Joined Government |
| 2025 | Chris d'Entremont | Gained | from Conservative | Joined Government |
| 2026 | Matt Jeneroux | Gained | from Conservative | Joined Government |
| 2026 | Marilyn Gladu | Gained | from Conservative | Joined Government |