| Dates of Office | Premier | Party | (Born - Died) |
| 01 Jul 1867 - 16 Jul 1867 | The Honourable Sir John Alexander Macdonald (Acting) | Lib | (b. 1815 - d. 1891) |
| 16 Jul 1867 - 20 Dec 1871 | John Sandfield Macdonald | Lib | (b. 1812 - d. 1872) |
| 20 Dec 1871 - 25 Oct 1872 | Edward Blake | Lib | (b. 1833 - d. 1912) |
| 25 Oct 1872 - 25 Jul 1896 | The Honourable Sir Oliver Mowat | Lib | (b. 1820 - d. 1903) |
| 25 Jul 1896 - 21 Oct 1899 | Arthur Hardy | Lib | (b. 1837 - d. 1901) |
| 21 Oct 1899 - 08 Feb 1905 | George Ross | Lib | (b. 1841 - d. 1914) |
| 08 Feb 1905 - 25 Sep 1914 | Sir James Whitney | Con | (b. 1843 - d. 1914) |
| 25 Sep 1914 - 2 Oct 1914 | William John Hanna (Acting) | Con | (b. 1862 - d. 1919) |
| 02 Oct 1914 - 14 Nov 1919 | Sir William Hearst | Con | (b. 1864 - d. 1941) |
| 14 Nov 1919 - 16 Jul 1923 | Ernest Drury | UFO | (b. 1878 - d. 1968) |
| 16 Jul 1923 - 15 Dec 1930 | George Ferguson | Con | (b. 1870 - d. 1946) |
| 15 Dec 1930 - 10 Jul 1934 | George Henry | Con | (b. 1871 - d. 1958) |
| 10 Jul 1934 - 21 Oct 1942 | Mitchell Hepburn | Lib | (b. 1886 - d. 1953) |
| 21 Oct 1942 - 18 May 1943 | Gordon Conant | Lib | (b. 1885 - d. 1953) |
| 30 Apr 1943 (hours) | Thomas McQuesten (Acting) | Lib | (b. 1882 - d. 1948) |
| 18 May 1943 - 17 Aug 1943 | Harry Nixon | Lib | (b. 1891 - d. 1962) |
| 17 Aug 1943 - 19 Oct 1948 | Colonel George Drew | PC | (b. 1894 - d. 1973) |
| 19 Oct 1948 - 04 May 1949 | Thomas Kennedy | PC | (b. 1878 - d. 1960) |
| 04 May 1949 - 08 Nov 1961 | Leslie M. Frost | PC | (b. 1895 - d. 1973) |
| 08 Nov 1961 - 01 Mar 1971 | The Honourable John Robarts | PC | (b. 1917 - d. 1982) |
| 01 Mar 1971 - 08 Feb 1985 | The Honourable Bill Davis | PC | (b. 1929) |
| 08 Feb 1985 - 26 Jun 1985 | Frank Miller | PC | (b. 1927 - d. 2000) |
| 26 Jun 1985 - 01 Oct 1990 | David Peterson | Lib | (b. 1943) |
| 01 Oct 1990 - 26 Jun 1995 | Bob Rae | NDP | (b. 1948) |
| 26 Jun 1995 - 15 Apr 2002 | Mike Harris | PC | (b. 1945) |
| 15 Apr 2002 - 23 Oct 2003 | Ernie Eves | PC | (b. 1946) |
| 23 Oct 2003 - 11 Feb 2013 | Dalton McGuinty | Lib | (b. 1955) |
| 11 Feb 2013 - 29 Jun 2018 | Kathleen Wynne | Lib | (b. 1953) |
| 29 Jun 2018 - | Doug Ford | PC | (b. 1964) |
