List of political parties in Ontario
Parties represented in the Legislative Assembly
Other registered parties
- Communist Party of Ontario (founded 1940)
- Ontario Provincial Confederation of Regions Party (founded 1989)
- Family Coalition Party of Ontario (founded 1986)
- Freedom Party of Ontario (founded 1984)
- Green Party of Ontario (founded 1983)
- Ontario Libertarian Party (founded 1975)
- Reform Party of Ontario (founded 1989, revived in 2007)
- Republican Party of Ontario (founded 2007)
- Party for People with Special Needs (founded 2007)
Unregistered parties
Historical parties that won seats in the Legislative Assembly
- Co-operative Commonwealth Federation (1932-1961) - formally merged with labour interests to become the Ontario New Democratic Party in 1961
- (Independent) Labour (1874-1937)
- Labour Progressive Party (1941-1959)
- Liberal-Labour (1943-1970s)
- Liberal-Progressive (1934-1940)
- Patrons of Industry (1894-1900)
- Protestant Protective Association (1894-1900)
- Soldier Party (1919-1923)
- United Farmers of Ontario (1918-1940)
Pre-Confederation parties
- Clear Grits pre-Confederation
- Reform Party pre-Confederation
- Family Compact (pre-1837 ruling clique)
Other historical parties
- Natural Law Party of Ontario 1993-2000
- Northern Ontario Heritage Party 1977-1981
- Ontario Alternative 2007
- Reform Party of Ontario 1999
- Representative Party of Ontario
- Social Credit Party of Ontario 1940s-1970s
- Unparty 1980-1983
Municipal parties
- Metro New Democratic Party 1970s- early 1990s
- Civic Liberals 1969