The Ontario New Democratic Party (NDP; French: Nouveau Parti démocratique de l'Ontario, NPD) is a social democratic provincial political party in Ontario, Canada. The party sits on the centre-left of the political spectrum. It is Ontario’s provincial section of the federal New Democratic Party. The party has formed the Official Opposition in Ontario since the 2018 general election.
It was formed in October 1961 from the Co-operative Commonwealth Federation (Ontario Section) (Ontario CCF) and the Ontario Federation of Labour (OFL).
For many years, the Ontario NDP was the most successful provincial NDP branch outside the national party's western heartland. It had its first breakthrough under its first leader, Donald C. MacDonald in the 1967 provincial election, when the party elected 20 members of Provincial Parliament (MPPs) to the Ontario Legislative Assembly. After the 1970 leadership convention, Stephen Lewis became leader, and guided the party to Official Opposition status in 1975, the first time since the Ontario CCF did it twice in the 1940s. After the party's disappointing performance in the 1977 provincial election, that included losing second party status, Lewis stepped down and Michael Cassidy was elected leader in 1978. Cassidy led the party through the 1981 election and stepped down following the disappointing results.
In 1982, Bob Rae was elected leader. Under his leadership, in 1985, the party held the balance-of-power with the signing of an accord with the newly elected Ontario Liberal Party minority government. After the 1987 Ontario general election, the NDP became the Official Opposition again. The 1990 Ontario general election surprisingly produced the NDP's breakthrough first government in 1990. The victory produced the first NDP provincial government east of Manitoba.
During this time, Rae’s government brought forward a number of initiatives that were unpopular such as the Social Contract. The 1995 election saw the NDP reduced from a majority government to 17 seats, the lowest number of seats since the 1963 election. Rae stepped down as leader in February 1996.
Howard Hampton was elected leader at the 1996 Hamilton convention and led the party through three elections. Hampton's period as leader saw poor election results causing the NDP to lose official party status twice: after the 1999 and 2003 elections. He was able to regain party status the first time after the governing Progressive Conservatives revised party status requirements in accordance with that election's reduction in the number of seats in the legislature, and the second time after winning a string of by-elections in the mid-2000s. The party maintained party status after the 2007 Ontario general election and he stepped down as leader in 2009.
Andrea Horwath was elected leader at the 2009 leadership convention in Hamilton. Under her leadership in the 2011 Ontario general election, the party elected 17 MPPs to the legislature and grew to 21 in the 2014 Ontario general election. Under Horwath, the party achieved its second highest seat count (other than forming government in 1990) when it formed the Official Opposition with 40 MPPs after the 2018 Ontario general election. This dropped to 31 MPPs after the 2022 Ontario general election, with Horwath announcing her resignation as leader. Marit Stiles replaced her after she was acclaimed leader at the 2023 leadership election. She led the party into the 2025 Ontario general election, winning 27 seats and forming the Official Opposition for the third consecutive time, a first in party history. However, the party's vote share slipped below 20%.
Contents
History
Origins as the Ontario CCF
The NDP's predecessor, the Co-operative Commonwealth Federation (CCF), was a democratic socialist political party, founded in 1932. The Ontario CCF in turn was indirectly the successor to the 1919–23 United Farmers of Ontario–Labour coalition that formed the government in Ontario under Ernest C. Drury.
As the Ontario Co-operative Commonwealth Federation (Ontario Section) under Ted Jolliffe as their first leader, the party nearly won the 1943 provincial election, winning 34 seats and forming the official opposition for the first time. Two years later, they would be reduced to eight seats. The final glory for the Ontario CCF came in the 1948 provincial election, when party elected 21 MPPs, and again formed the official opposition. They were even able to defeat Premier George A. Drew in his own constituency, when the CCF's Bill Temple won in High Park, even though the Progressive Conservative Party of Ontario won another majority government. In 1951, the Ontario CCF was reduced to two MPP's in that year's provincial election. In the two remaining elections while it existed, the party never had more than five members in the legislature. Jolliffe resigned as leader in 1953.
End of the CCF/New Party and revival
Donald C. MacDonald became leader in 1953, and spent the next fifteen years rebuilding the party, from two seats when he took over the party's helm, to ten times that number when he stepped down in 1970. Delegates from the Ontario CCF, delegates from affiliated union locals, and delegates from New Party Clubs took part in the founding convention of the New Democratic Party of Ontario held in Niagara Falls at the Sheraton Brock hotel from 7–9 October 1961 and elected MacDonald as their leader. The Ontario CCF Council ceased to exist formally on Sunday, 8 October 1961, when the newly elected NDP executive officially took over.
The Ontario NDP gradually picked up seats through the 1960s. It achieved a breakthrough in the 1967 provincial election, when its popular vote rose from 15% to 26%. The party increased its presence in the legislature from 8 to 20 seats. In that election the party ran on the themes of the cost of living, tax distribution, education costs, Canadian unity, and housing.
Official Opposition under Stephen Lewis
Stephen Lewis took over the party's leadership in 1970, and the NDP's popularity continued to grow. With the 1975 provincial election, the governing Progressive Conservative party was reduced to a minority government for the first time in thirty years. The charismatic and dynamic Lewis ran a strong election campaign that forced the Tories to promise to implement the NDP's rent control policies. The NDP overtook the Liberals to become the Official Opposition with 38 seats and 29% of the vote. However, the Tories retained power as a minority government.
Hopes were high that the NDP was on the verge of taking power. However, in the 1977 provincial election, the Tories under Bill Davis again won a minority government. The NDP lost five seats; they also slipped into third place behind the Ontario Liberal Party. A frustrated Lewis resigned shortly afterwards.
Third-party status under Michael Cassidy
Michael Cassidy was elected leader, but being the most left-wing of the three leadership candidates, he was not fully trusted by the party establishment. Cassidy's policy advisor in the leadership campaign was James Laxer, a former leader of The Waffle NDP faction which Lewis had expelled from the party in 1972. Some members of the NDP caucus considered Cassidy's election as a serious mistake, and encouraged him to resign before contesting an election. Cassidy ignored this advice, and remained as leader. The NDP declined further in the 1981 provincial election and Cassidy stepped down.
The party's fortunes turned around under the leadership of Bob Rae. The NDP captured two by-elections at the cost of the Liberals. In late 1984, polls showed Rae's NDP ahead of the David Peterson-led Liberals.
Opposition then Government under Bob Rae
The 1985 provincial election resulted in a minority legislature: the Tories under incumbent Premier Frank Miller won 52 seats, the Liberals won 48, and the NDP 25. The New Democrats entered negotiations with both the Tories and the Liberals. The NDP signed a two-year accord with the Liberals, in which the Liberals would form government with the NDP's support in exchange for the implementation of a number of NDP policies. This was not a coalition government as the NDP declined an offer to sit in Cabinet, preferring to remain in opposition. The governing Tories were defeated by a non-confidence motion and Miller resigned.
When the accord expired in 1987, Premier David Peterson called an early provincial election and the Liberals were re-elected with a large majority. The NDP lost seats but emerged as the largest opposition party, with Bob Rae becoming Leader of the Opposition.
Shortly before the 1990 provincial election, the governing Liberals held a solid lead in the polls, though their popularity had tailed off from 1987. However, Peterson's government was soon mired in scandals and many regarded the early election call as cynical. Under Rae, the NDP ran a strong campaign, which was also aided by a successful showing for federal New Democratic Party a couple years earlier. Although the NDP finished only three percentage points ahead of the Liberals, they managed to take many seats in the Greater Toronto Area away from the Liberals. As a result, the NDP won a large majority government of 74 seats while the Liberals suffered the worst defeat in their history.
Bob Rae became Premier of Ontario during the worst economic downturn since the Great Depression. In government, the NDP disappointed supporters by abandoning much of its ambitious program, including the promise to institute a public auto insurance system. As the recession worsened, the NDP implemented what it called the Social Contract – this was a package of austerity measures that:
reopened the collective bargaining agreements of public sector unions;
implemented a wage freeze for public servants; and
Post-government under Howard Hampton
Rae was succeeded by Bud Wildman as interim leader in 1996, until Howard Hampton defeated Frances Lankin, a member of Rae's inner circle, for the party leadership that same year.
Under Hampton, the party largely repudiated Rae's policies and renewed its commitment to a moderate form of socialism. Shortly after the 1999 provincial election, Hampton cited the Swedish model of social democracy as closely reflecting his own beliefs.
Ontario NDP support fell even further in the 1999 provincial election, leaving the party with just nine seats. However, this was largely due to tactical voting in which NDP supporters voted Liberal in hopes of removing Harris and the Tories from power. As a result, Hampton was not blamed for this severe defeat and stayed on as leader.
Under the rules of the Legislative Assembly, a party would receive official party status, and the resources and privileges accorded to officially recognized parties, if it had 12 or more seats; thus, it initially appeared the NDP would lose caucus funding and the ability to ask questions in the House. However, the governing Progressive Conservatives changed the rules after the election to lower the threshold for party status from 12 seats to 8. The Progressive Conservatives had reduced the size of the legislature, so provincial ridings now had the same boundaries as the federal ones, and so the official party status threshold was lowered. Some suggested that the Tories helped the NDP so they could continue to split the vote with the Liberals, although the Progressive Conservatives had stated before the election campaign even began that reducing official party status to eight seats was part of the seat reduction plan from the very beginning.
In the 2003 election, the party emphasized their "Public Power Campaign", which had two key issues, primarily publicly owned electricity generation and distribution, and publicly run auto insurance. As well, the Public Power Campaign also dealt with rolling-back the social program cuts from the Harris government's Common Sense Revolution. Many media outlets – including The Globe and Mail – thought that party leader Howard Hampton performed strongly in the televised leaders' debate. Despite Hampton's debate performance and a 2.4% increase in the popular vote, the party lost two seats, once again losing official party status and their previous speaking privileges and funding. One of the problems that likely affected NDP support was strategic voting, not unlike that of the 1999 election. Dozens of NDP voters voted Liberal in order to ensure that the Tories would be defeated. This voting practice did do damage to the NDP's electoral fortunes because it was interpreted as a call for blanket support for Liberal candidates over NDP candidates, with no real thought to which candidate had a better chance to defeat a PC in any individual riding. Several unions, such as the Canadian Auto Workers (CAW), promoted strategic voting to their membership and the public, which further added to the party's woes. The newly elected Liberal government offered to give the NDP caucus research funding if their members agreed to sit as independents. Hampton refused and disrupted the government Throne Speech in protest.
Resurgence under Andrea Horwath
On 7 November 2008, Andrea Horwath officially launched her campaign to win the party's leadership. Horwath advocated heavy investment in light rail. In party matters, she emphasised a closer relationship to unions and the hiring of regional organisers. The leadership election was held 6–8 March 2009. Horwath led on the first two ballots, and won on the third ballot with 60.4% of the vote.
In the lead-up to the 2011 election, Horwath began to campaign on tax incentives for businesses that create jobs in the province, making investments that improve health-care wait times, and cutting the Harmonized Sales Tax from necessities such as home-heating and gas. Instead of providing broad corporate tax cuts, Horwath would have focused on tax cuts for small businesses and companies that make investments in Ontario. Her campaign also criticized the McGuinty government for not soliciting competitive bids for green energy projects, and pledged to have a public bidding process where preference is given to local providers.
Horwath distanced the Ontario NDP from former Premier Bob Rae, then the interim leader of the federal Liberal Party of Canada, by pointing out that he is the exception to the rule of NDP Premiers in other provinces who have been able to balance provincial budgets. At the official televised leaders' debate, her political rivals criticized the Ontario NDP's handling of the economy in the early 1990s, but Horwath further distanced the party from Rae by pointing out his current allegiance to the federal Liberals as interim leader of the (federal) Liberal Party. Her campaign largely refrained from mudslinging and personal attacks, and she led her party to an increase from 10 seats to 17 seats in the legislature. The Liberals were re-elected with a minority government giving Horwath's NDP the balance of power in the legislature.
At an automatic leadership review held at the party's provincial convention in April 2012, 76.4% of delegates voted in favour of Horwath's continued leadership.
In September 2012, NDP candidate Catherine Fife won a by-election in the riding of Kitchener—Waterloo after the resignation of former Progressive Conservative MPP Elizabeth Witmer. Fife's victory increased the NDP caucus to a total of 18 seats in the provincial legislature.
Official Opposition under Marit Stiles
After the interim leadership of Peter Tabuns, Marit Stiles was declared Ontario NDP leader by a majority vote at an event in Downtown Toronto on February 4, 2023.
In October 2023, Hamilton Centre MPP Sarah Jama was removed from the NDP caucus for allegedly failing to abide by the terms of an agreement between herself and Stiles. Jama was accused of taking a "number of unilateral actions" without party endorsement, which included making statements regarding the Gaza war; being uncooperative with NDP colleagues; and threatening Premier Doug Ford with legal action without first consulting her caucus. Stiles had originally defended Jama, and had met privately with Jama beforehand, asking her to remove her statement and apologize. Jama subsequently apologized for her posts but, in defiance of the party's directive, refused to remove the statement, instead pinning it to the top of her feed on X. Jama said: "I don't plan on apologizing..." The NDP was divided over the issue. Some in the NDP stated that Jama should have been ejected sooner for refusing to remove her statement; some were critical of the political damage that resulted from the delay in expelling Jama with one MPP having to be convinced not to quit the NDP over the delay; while others criticized Stiles for her decision to remove Jama from caucus including two constituency associations that demanded Stiles resign as leader.
On February 3, 2026, ONDP deputy leader Doly Begum resigned to run as a federal Liberal by-election candidate; the party held the seat in the 2026 Scarborough Southwest provincial by-election.
Party leaders
The party was known as the Ontario section of the Co-operative Commonwealth Federation until the New Democratic Party's founding convention on 8 October 1961, at which point Donald C. MacDonald ceased to be the CCF leader and became the Ontario NDP leader.
Election results
Results include those of the Co-operative Commonwealth Federation (CCF). The CCF essentially became the New Democratic Party (NDP) on October 8, 1961.
Legislative Assembly
§Regained official party status after a 2004 by-election.
Structure
The officers of the Ontario NDP are the leader, the party president, six vice-presidents and the treasurer. Apart from the leader, the party officers are elected at the party's biennial convention. The leader is head of the parliamentary party and leads the party caucus in the Ontario legislature and is the party's presumed candidate to lead an NDP government should the party be called upon to form a government. The Provincial Director (formerly Provincial Secretary) is an employee of the party and manages the day to day party organization outside of the legislature. The Provincial Director is hired by the party executive with the ratification of the provincial council.
The party's provincial executive is composed of the party's officers, six men and six women elected on a regional basis, three women and three men elected at large, one woman and one man elected by the Ontario New Democratic Youth, two women representing the Women & Gender Diverse Committee (formerly the Women's Committee), one woman and one man representing the Lesbian, Gay and Trans-identified Committee, one woman and one man representing the party's ethnic committees, one woman and one man representing the Disability Rights Committee and one woman and one man representing the Aboriginal Section.
The highest decision-making body of the party is the provincial convention held once every two years. The convention is made up of delegates elected by riding associations, sections of the party (ONDY, Women & Gender Diverse, LGBT, Ethnic, Aboriginal, Disability), affiliates such as labour unions and other bodies.
The Provincial Council is the next highest decision making level and meets between conventions, usually three or four times a year. the Provincial Council is made up of the provincial executive, two representatives of the party's provincial caucus, delegates elected from each riding association, representatives of regional party bodies, representatives of sections of the party and party affiliates.
