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For more information on provincial politics, see Politics in Ontario.
| Premier | Party | Term |
| Doug Ford | Progressive Conservative | 2018-present |
| Kathleen Wynne | Liberal |
2013-18
|
| Dalton McGuinty | Liberal | 2003-13 |
| Ernie Eves | Progressive Conservative | 2002-03 |
| Mike Harris | Progressive Conservative | 1995-2002 |
| Bob Rae | NDP | 1990-95 |
| David Peterson | Liberal | 1985-90 |
| Frank Miller | Progressive Conservative | 1985 |
| Bill Davis | Conservative | 1971-85 |
| John Robarts | Progressive Conservative | 1961-71 |
| Leslie Frost | Progressive Conservative | 1949-61 |
| Thomas Laird Kennedy | Progressive Conservative | 1948-49 |
| George A. Drew | Progressive Conservative | 1943-48 |
| Harry Nixon | Liberal | 1943 |
| Gordon Daniel Conant | Liberal | 1942-43 |
| Mitchell Hepburn | Liberal | 1934-42 |
| George Stewart Henry | Conservative | 1930-34 |
| Howard Ferguson | Conservative | 1923-30 |
| Ernest Drury | United Farmers of Ontario | 1919-23 |
| William Hearst | Conservative | 1914-19 |
| James Whitney | Conservative | 1905-14 |
| George William Ross | Liberal | 1899-1905 |
| Arthur Sturgis Hardy | Liberal | 1896-99 |
| Oliver Mowat | Liberal | 1872-96 |
| Edward Blake | Liberal | 1871-72 |
| John Sandfield Macdonald | Liberal-Conservative | 1867-71 |
