The Ontario general election of 1990 was held on September 6, 1990, to elect members of the Legislative Assembly of the province of Ontario, Canada.
The governing Ontario Liberal Party led by Premier David Peterson, was defeated by a large unexpected protest vote. Peterson was accused of opportunism in calling an election just three years into his mandate, and in a shocking upset, the New Democratic Party, led by Bob Rae, won a majority government. This marked the first time the NDP formed the government in Ontario.
Mike Harris's Progressive Conservative Party was unable to overcome voter distrust of the federal Progressive Conservative government of Brian Mulroney. His party managed to win four more seats than in the 1987 election, however.
Although Harris was from northern Ontario, the PC Party was particularly weak in that region, placing fourth, behind the Liberals, NDP and the right-wing, fringe Confederation of Regions Party (CoR) in six northern Ontario ridings (Algoma, Cochrane South, Nickel Belt, Sudbury, Sudbury East and Sault Ste. Marie). The CoR Party also placed ahead of the PC Party in the Renfrew North and Cornwall ridings in eastern Ontario.
The Green Party of Ontario placed third, ahead of the NDP, in Parry Sound riding, where former Liberal leadership candidate Richard Thomas was the party's candidate.
| Party | Party Leader | # of candidates | Seats | Popular Vote | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1987 | Elected | % Change | # | % | % Change | New Democratic | Bob Rae | 130 | 19 | 74 | align=center | 1,509,506 | 37.6% | +11.9% | Liberal | David Peterson | 130 | 95 | 36 | -62.1% | 1,302,134 | 32.4% | -14.9% | Progressive Conservative | Mike Harris | 130 | 16 | 20 | align=center | 944,564 | 23.5% | -1.2% | Family Coalition | Donald Pennell | 68 | - | - | - | 110,831 | 2.7% | +1.4% | Confederation of Regions | Dean Wasson | 33 | - | 75,873 | 1.9% | Green | Katherine Mathewson | 40 | - | - | - | 30,097 | 0.7% | +0.6% | Libertarian | James Stock | 45 | - | - | - | 24,613 | 0.6% | +0.2% | Freedom | Robert Metz | 10 | - | - | - | 6,015 | 0.2% | +0.1% | Communist | Elizabeth Rowley | 4 | - | - | - | 1,139 | 0.1% | - | Others | 15 | - | - | - | 13,307 | 0.3% | -0.1% | ||||
| Total | 605 | 130 | 130 | - | 4,018,079 | 100% | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
* In 1993, Ward died and Drainville left the Legislative Assembly. Both resulting byelections were won by the Progressive Conservatives. Rizzo left the NDP caucus in October, 1990, but sat as an Independent until the 1995 election. In 1993 North resigned and sat as an independent. Akande resigned from the Legislature in 1994; no byelection was held prior to the 1995 election.
* Nixon and Scott retired from politics in 1992, and Mancini retired in 1993. The Liberals retained all three seats in the resulting byelections. Bruce Crozier, Ronald Eddy and Tim Murphy joined the Liberal caucus. John Sola was expelled from caucus in 1992 after making racist comments to a reporter from the fifth estate. He sat as an independent for the remainder of the assembly.
The PC Party won two byelections in 1993, winning seats previously held by the NDP. Chris Hodgson was elected in Victoria—Haliburton, and David Johnson was elected in Don Mills.
Stormont—Dundas—Glengarry & East Grenville:
| St. Andrew—St. Patrick | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Party | Candidate | Votes | % | ||||||||||||||||
| New Democratic Party | Zanana Akande | 10,321 | 34.45 | Progressive Conservative | Nancy Jackman | 9,241 | 30.85 | Liberal | (x)Ron Kanter | 8,938 | 29.84 | Green | Jim Harris | 1,112 | 3.71 | Libertarian | Douglas Quinn | 344 | 1.15 |
| Total valid votes | 29,956 | 100.00 | |||||||||||||||||
| Rejected, unmarked and discarded votes | 377 | ||||||||||||||||||
| Turnout | 30,333 | 66.89 | |||||||||||||||||
| Hamilton Centre | |||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Party | Candidate | Votes | % | ||||||||||||||||||||
| New Democratic Party | David Christopherson | 14,029 | 55.32 | Liberal | (x)Lily Oddie Munro | 7,814 | 30.81 | Progressive Conservative | Graham Snelgrove | 2,116 | 8.34 | Green | Brent Monkley | 605 | 2.39 | Libertarian | Julien Frost | 429 | 1.69 | Family Coalition Party | Jewell Wolgram | 365 | 1.44 |
| Total valid votes | 25,358 | 100.00 | |||||||||||||||||||||
| Total rejected, unmarked and declined ballots | 446 | ||||||||||||||||||||||
| Turnout | 25,804 | 59.78 | |||||||||||||||||||||
| St. Catharines | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Party | Candidate | Votes | % | ||||||||||||||||
| Liberal | (x)Jim Bradley | 11,565 | 38.76 | New Democratic Party | Dave Kappele | 10,629 | 35.63 | Progressive Conservative | Bruce Timms | 3,926 | 13.16 | Confederation of Regions | Eva Longhurst | 2,384 | 7.99 | Family Coalition Party | Bert Pynenburg | 1,331 | 4.46 |
| Total valid votes | 29,835 | 100.00 | |||||||||||||||||
| Rejected, unmarked and discarded votes | 337 | ||||||||||||||||||
| Turnout | 30,172 | 66.77 | |||||||||||||||||