This is a list of the Parliaments of the Ontario Legislative Assembly, the legislature of the Canadian province of Ontario, since Canadian Confederation in 1867. The Legislative Assembly has existed since 1867 when the British North America Act, 1867 severed the Province of Canada into two new provinces, with the portion then called Canada West becoming Ontario. For the Parliaments prior to Confederation, see Parliament of the Province of Canada (1841 to 1867) and Parliament of Upper Canada (1791 to 1841).

Diagram	Assembly Sessions	Election	From To [1]	Governing Party	Premier	Official Opposition Party Leader	Other Official Party Leader	Speaker
	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

^A Although they had fewer seats than the Conservatives, the Liberals formed a minority government with the support of the NDP.

• Ontario. "Historical Records". Past & Present MPPs. Office of the Legislative Assembly of Ontario. Archived from the original on 2007-03-16. Retrieved 2007-03-11.
• Ontario. "Speakers of the Legislative Assembly of Ontario". The Speaker. Office of the Legislative Assembly of Ontario. Archived from the original on 2007-07-04. Retrieved 2007-02-16.