Diagram | Assembly Sessions | Election | From To [1] | Governing Party | Premier | Official Opposition Party Leader | Other Official Party Leader | Speaker |
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| 1st Parliament | 1st general | Sep. 3, 1867 Feb. 25, 1871 | Liberal-Conservative and Liberal coalition | John Sandfield Macdonald | none | none | John Stevenson |
| 2nd Parliament | 2nd general | Mar. 21, 1871 ... | Liberal | Edward Blake | Liberal-Conservative: Matthew Crooks Cameron | none | Richard Scott (1871) James Currie (1871–1873) Rupert Wells (1874) |
Oct. 25, 1872 Dec. 23, 1874 | Sir Oliver Mowat |
| 3rd Parliament | 3rd general | Jan. 18, 1875 April 25, 1879 | Liberal | Sir Oliver Mowat | Conservative: Matthew Crooks Cameron (1875–1878) Sir William Ralph Meredith (1878–1879) | none | Rupert Wells |
| 4th Parliament | 4th general | June 5, 1879 Feb. 1, 1883 | Liberal | Sir Oliver Mowat | Conservative: Sir William Ralph Meredith | none | Charles Clarke |
| 5th Parliament | 5th general | Feb. 27, 1883 Nov. 15, 1886 | Liberal | Sir Oliver Mowat | Conservative: Sir William Ralph Meredith | none | Charles Clarke |
| 6th Parliament | 6th general | Dec. 29, 1886 April 26, 1890 | Liberal | Sir Oliver Mowat | Conservative: Sir William Ralph Meredith | none | Jacob Baxter |
| 7th Parliament | 7th general | June 5, 1890 May 29, 1894 | Liberal | Sir Oliver Mowat | Conservative: Sir William Ralph Meredith | none | Thomas Ballantyne |
| 8th Parliament | 8th general | June 26, 1894 ... | Liberal | Sir Oliver Mowat | Conservative: Sir William Ralph Meredith (1894) George Marter (1894–1896) Sir James Whitney | none | William Balfour (1895–1896) Francis Evanturel (1897–1898) |
Jul. 21, 1896 Jan. 28, 1898 | Arthur Hardy |
| 9th Parliament | 9th general | Mar. 1, 1898 ... | Liberal | Arthur Hardy | Conservative: Sir James Whitney | none | Francis Evanturel |
Oct. 20, 1899 April 19, 1902 | Sir George William Ross |
| 10th Parliament | 10th general | May 29, 1902 Dec. 13, 1904 | Liberal | Sir George William Ross | Conservative: Sir James Whitney | none | William Charlton |
| 11th Parliament | 11th general | Jan. 25, 1905 May 2, 1908 | Conservative | Sir James Whitney | Liberal: Sir George William Ross (1905–1907) George P. Graham (1907) Alexander Grant MacKay (1907–1908) | none | Joseph St. John (1905–1907) Thomas Crawford (1907–1908) |
| 12th Parliament | 12th general | June 8, 1908 Nov. 13, 1911 | Conservative | Sir James Whitney | Liberal: Alexander Grant MacKay | none | Thomas Crawford |
| 13th Parliament | 13th general | Dec. 11, 1911 May 29, 1914 | Conservative | Sir James Whitney | Liberal: Newton Rowell | none | William Hoyle |
| 14th Parliament | 14th general | June 29, 1914 ... | Conservative | Sir James Whitney | Liberal: Newton Rowell (1914–1917) William Proudfoot (1917–1919) | none | David Jamieson |
Oct. 2, 1914 Sep. 23, 1919 | Sir William Hearst |
| 15th Parliament | 15th general | Oct. 20, 1919 May 10, 1923 | United Farmers | Ernest Drury | Liberal: Hartley Dewart (1919–1921) Wellington Hay (1921–1923) | Conservative | Nelson Parliament |
| 16th Parliament | 16th general | June 25, 1923 Oct. 18, 1926 | Conservative | Howard Ferguson | Liberal: William Sinclair | United Farmers | Joseph Thompson |
| 17th Parliament | 17th general | Dec. 1, 1926 Sep. 17, 1929 | Conservative | Howard Ferguson | Liberal: William Sinclair | none | William Black |
| 18th Parliament | 18th general | Oct. 30, 1929 ... | Conservative | Howard Ferguson | Liberal: William Sinclair | none | Thomas Kidd |
Dec. 16, 1930 May 16, 1934 | George Stewart Henry |
| 19th Parliament | 19th general | June 19, 1934 Aug. 25, 1937 | Liberal | Mitchell Hepburn | Conservative: George Henry | none | Norman Hipel |
| 20th Parliament | 20th general | Oct. 6, 1937 ... | Liberal | Mitchell Hepburn | Conservative: George Henry (1937–1939) George Drew (1939–1943) | none | Norman Hipel (1937–1938) James Clark (1939–1943) |
Oct. 21, 1942 ... | Gordon Daniel Conant |
May 18, 1943
| Harry Nixon |
| 21st Parliament | 21st general | Aug. 4, 1943 Mar. 24, 1945 | Progressive Conservative minority (38 of 90 seats) | George Drew | Co-operative Commonwealth Federation: Ted Jolliffe | Liberal | William James Stewart |
| 22nd Parliament | 22nd general | June 4, 1945 April 27, 1948 | Progressive Conservative (66 of 90 seats) | George Drew | Liberal: Farquhar Oliver | none | William James Stewart (1945–1947) James Hepburn (1947–1948) |
| 23rd Parliament | 23rd general | June 7, 1948 ... | Progressive Conservative (53 of 90 seats) | George Drew | Co-operative Commonwealth Federation: Ted Jolliffe | Liberal | M.C. Davies |
Oct. 19, 1948 ... | Thomas Laird Kennedy |
May 4, 1949 Oct. 6, 1951 | Leslie Frost |
| 24th Parliament | 24th general | Nov. 22, 1951 May 2, 1955 | Progressive Conservative (79 of 90 seats) | Leslie Frost | Liberal: Farquhar Oliver
| none | M.C. Davies |
| 25th Parliament | 25th general | June 9, 1955 May 4, 1959 | Progressive Conservative (87 of 98 seats) | Leslie Frost | Liberal: Farquhar Oliver (1955–1958) John Wintermeyer (1958–1959) | none | Alfred Downer |
| 26th Parliament | 26th general | June 11, 1959 ... | Progressive Conservative (71 of 98 seats) | Leslie Frost | Liberal: John Wintermeyer | none | William Murdoch |
Nov. 8, 1961 Aug. 16, 1963 | John Robarts |
| 27th Parliament | 27th general | Sep. 25, 1963 Sep. 5, 1967 | Progressive Conservative (77 of 108 seats) | John Robarts | Liberal: Farquhar Oliver (1963–1964) Andy Thompson (1964–1966) Robert Nixon (1967) | none | Donald Morrow |
| 28th Parliament | 28th general | Oct. 17, 1967 ... | Progressive Conservative (69 of 117 seats) | John Robarts | Liberal: Robert Nixon | New Democratic | Frederick Cass |
Mar. 1, 1971 Sep. 13, 1971 | Bill Davis |
| 29th Parliament | 29th general | Oct. 21, 1971 Aug. 11, 1975 | Progressive Conservative (78 of 117 seats) | Bill Davis | Liberal: Robert Nixon | New Democratic: Stephen Lewis | Allan Reuter (1971–1974) Russell Rowe (1974–1975) |
| 30th Parliament | 30th general | Sep. 18, 1975 April 29, 1977 | Progressive Conservative minority (51 of 125 seats) | Bill Davis | New Democratic: Stephen Lewis | Liberal: Robert Nixon (1975–1976) Stuart Smith (1976–1977) | Russell Rowe |
| 31st Parliament | 31st general | June 9, 1977 Feb. 2, 1981 | Progressive Conservative minority (58 of 125 seats) | Bill Davis | Liberal: Stuart Smith | New Democratic: Stephen Lewis (1978) Michael Cassidy (1978–1981) | Jack Stokes |
| 32nd Parliament 4 sessions | 32nd general | Mar. 19, 1981 ... | Progressive Conservative (70 of 125 seats) | Bill Davis | Liberal: Robert Nixon (1982) David Peterson (1982–1985) | New Democratic: Michael Cassidy (1982) Bob Rae (1982–1985) | John M. Turner |
Feb. 8,1985 Mar. 25, 1985 | Frank Miller |
| 33rd Parliament 3 sessions | 33rd general | May 2, 1985 ... | Progressive Conservative minority (52 of 125 seats) | Frank Miller | Liberal: David Peterson (1985) | New Democratic: Bob Rae | Hugh Edighoffer |
June 26, 1985 July 31, 1987 | Liberal minority (48 of 125 seats) [A] | David Peterson | Progressive Conservative: Frank Miller (1985) Larry Grossman (1985–1987) |
| 34th Parliament 2 sessions | 34th general | Sep. 10, 1987 July 30, 1990 | Liberal (95 of 130 seats) | David Peterson | New Democratic: Bob Rae | Progressive Conservative: Andy Brandt (1987–1990) Mike Harris (1990) | Hugh Edighoffer |
| 35th Parliament 3 sessions | 35th general | Sep. 6, 1990 April 28, 1995 | New Democratic (74 of 130 seats) | Bob Rae | Liberal: Robert Nixon (1990–1991) Murray Elston (1991) Jim Bradley (1991–1992) Lyn McLeod (1992–1995) | Progressive Conservative: Mike Harris | David Warner |
| 36th Parliament 3 sessions | 36th general | Sep. 26, 1995 May 5, 1999 | Progressive Conservative (82 of 130 seats) | Mike Harris | Liberal: Lyn McLeod (1995–1996) Dalton McGuinty (1996–1999) | New Democratic: Bob Rae (1995–1996) Howard Hampton (1996–1999) | Al McLean (1995–1996) Edward Doyle (1996) Chris Stockwell (1996–1999) |
| 37th Parliament 4 sessions | 37th general | Oct. 20, 1999 ... | Progressive Conservative (59 of 103 seats) | Mike Harris | Liberal: Dalton McGuinty | New Democratic: Howard Hampton | Gary Carr |
April 15, 2002 June 26, 2003 | Ernie Eves |
| 38th Parliament 2 sessions | 38th general | Nov. 19, 2003 September 10, 2007 | Liberal (72 of 103 seats) | Dalton McGuinty | Progressive Conservative: Ernie Eves (2003–2004) John Tory (2004–2007) | New Democratic: Howard Hampton | Alvin Curling (2003–2005) Michael A. Brown (2005–2008) |
| 39th Parliament 2 sessions | 39th general | November 29, 2007 September 7, 2011 | Liberal (71 of 107 seats) | Dalton McGuinty | Progressive Conservative: Bob Runciman (2007–2009) Tim Hudak (2009–2014) | New Democratic: Howard Hampton (2007–2009) Andrea Horwath (2009–Present) | Steve Peters |
| 40th Parliament 2 sessions | 40th general | November 22, 2011 February 11, 2013 | Liberal minority (53 of 107 seats) | Dalton McGuinty | Progressive Conservative: Tim Hudak | New Democratic: Andrea Horwath | Dave Levac |
February 11, 2013 May 2, 2014 | Kathleen Wynne |
| 41st Parliament | 41st general | July 2, 2014 May 8, 2018 | Liberal (58 of 107 seats) | Kathleen Wynne | Progressive Conservative: Jim Wilson (2014-2015) Patrick Brown (2015-2018) Vic Fedeli (2018) | New Democratic: Andrea Horwath | Dave Levac |
| 42nd Parliament | 42nd general | July 11, 2018 May 3, 2022 | Progressive Conservative (76 of 124 seats) | Doug Ford | New Democratic: Andrea Horwath | none | Ted Arnott |
| 43rd Parliament | 43rd general | August 8, 2022 - | Progressive Conservative (83 of 124 seats) | Doug Ford | New Democratic: Peter Tabuns | none | Ted Arnott |