The Speaker of the Legislative Assembly of Ontario is the presiding officer of the Legislative Assembly of Ontario.
Nelson Parliament was Speaker of the Legislature of Ontario from 1920 to 1923. He was first elected as a Liberal MLA for Prince Edward in the 1914 provincial election and served in the assembly until 1923.
The Second Parliament of Ontario was in session from March 21, 1871, until December 23, 1874, just prior to the 1875 general election. The majority party was the Ontario Liberal Party led by Edward Blake; Oliver Mowat replaced Blake as premier in October 1872. An act was passed in 1872 which prohibited a member from holding a seat in the Legislative Assembly while holding a seat in the Dominion Parliament, a so-called "dual mandate". There were 88 members in the second legislature.
The 4th Parliament of Ontario was in session from June 5, 1879, until February 1, 1883, just prior to the 1883 general election. The majority party was the Liberal Party led by Oliver Mowat.
The 6th Parliament of Ontario was in session from December 29, 1886, until April 26, 1890, just prior to the 1890 general election. The majority party was the Ontario Liberal Party led by Oliver Mowat.
The 7th Legislative Assembly of Ontario was in session from June 5, 1890, until May 29, 1894, just prior to the 1894 general election. The majority party was the Ontario Liberal Party led by Oliver Mowat.
The 11th Legislative Assembly of Ontario was in session from January 25, 1905, until May 2, 1908, just prior to the 1908 general election. The majority party was the Ontario Conservative Party led by Sir James P. Whitney.
The 12th Legislative Assembly of Ontario was in session from June 8, 1908, until November 13, 1911, just prior to the 1911 general election. The majority party was the Ontario Conservative Party led by Sir James P. Whitney.
The 14th Legislative Assembly of Ontario was in session from June 29, 1914, until September 23, 1919, just prior to the 1919 general election. The majority party was the Ontario Conservative Party led by Sir James P. Whitney.
The 20th Legislative Assembly of Ontario was in session from October 6, 1937, until June 30, 1943, just prior to the 1943 general election. The majority party was the Ontario Liberal Party led by Mitchell Hepburn.
The 23rd Legislative Assembly of Ontario was in session from June 2, 1948, until October 6, 1951, just prior to the 1951 general election. The majority party was the Ontario Progressive Conservative Party, however its leader, George Drew, lost his seat in the 1948 general election and soon after resigned as party leader to enter federal politics and take the leadership of the Progressive Conservative Party of Canada. He was replaced on October 19, 1948, by Thomas Laird Kennedy who served as premier and interim Progressive Conservative leader until Leslie Frost became party leader and succeeded Kennedy as premier on May 4, 1949.
The 24th Legislative Assembly of Ontario was in session from November 22, 1951, until May 2, 1955, just prior to the 1955 general election. The majority party was the Ontario Progressive Conservative Party led by Leslie Frost.
The 27th Legislative Assembly of Ontario was in session from September 25, 1963, until September 5, 1967, just prior to the 1967 general election. The majority party was the Ontario Progressive Conservative Party led by John Robarts.
The 28th Legislative Assembly of Ontario was in session from October 17, 1967, until September 13, 1971, just prior to the 1971 general election. The majority party was the Ontario Progressive Conservative Party led by John Robarts.
The 31st Legislative Assembly of Ontario was in session from June 9, 1977, until February 2, 1981, just prior to the 1981 general election. The Ontario Progressive Conservative Party led by Bill Davis formed a second consecutive minority government.
The 32nd Legislative Assembly of Ontario was in session from March 19, 1981, until March 25, 1985, just prior to the 1985 general election. The majority party was the Ontario Progressive Conservative Party led by Bill Davis.
The 33rd Legislative Assembly of Ontario was held from June 4, 1985, until July 31, 1987, just prior to the 1987 general election.
The 34th Legislative Assembly of Ontario was in session from September 10, 1987, until July 30, 1990, just prior to the 1990 general election. The majority party was the Ontario Liberal Party led by David Peterson.
The 36th Legislative Assembly of Ontario, Canada's most-populous province, was in session from June 8, 1995, until May 5, 1999, just prior to the Ontario general election. Majority was held by the Progressive Conservative Party of Ontario led by Mike Harris.
The 37th Legislative Assembly of Ontario, Canada's most populous province, was in session from June 8, 1999, until May 5, 2003. Its membership was set by the general election of 1999. Majority was held by the Ontario Progressive Conservative Party led by Mike Harris.