Beginning with the 2003 election, Ontario elections are held every 4 years in October.

Ontario is the largest of Canada's ten provinces by population.

1867-1889

Seats

1890-1919

Seats

1920-1949

Seats

+ In 1943, the Conservative Party of Ontario became the Ontario Progressive Conservative Party.

1950-1979

Seats

+ The Co-operative Commonwealth Federation (CCF) became the New Democratic Party (NDP) in 1961.

1980-2003

Seats

Popular vote (%)

Source: Elections Ontario

2003 election

See also

• Ontario general election, 1867
• Ontario general election, 1871
• Ontario general election, 1875
• Ontario general election, 1879
• Ontario general election, 1883
• Ontario general election, 1886
• Ontario general election, 1890
• Ontario general election, 1894
• Ontario general election, 1898
• Ontario general election, 1902
• Ontario general election, 1905
• Ontario general election, 1908
• Ontario general election, 1911
• Ontario general election, 1914
• Ontario general election, 1919
• Ontario general election, 1923
• Ontario general election, 1926
• Ontario general election, 1929
• Ontario general election, 1934
• Ontario general election, 1937
• Ontario general election, 1943
• Ontario general election, 1945
• Ontario general election, 1948
• Ontario general election, 1951
• Ontario general election, 1955
• Ontario general election, 1959
• Ontario general election, 1963
• Ontario general election, 1967
• Ontario general election, 1971
• Ontario general election, 1975
• Ontario general election, 1977
• Ontario general election, 1981
• Ontario general election, 1985
• Ontario general election, 1987
• Ontario general election, 1990
• Ontario general election, 1995
• Ontario general election, 1999
• Ontario general election, 2003
• Ontario general election, 2007
• Lists of general elections in Canada