Marit Stiles

Leader of the Ontario NDP

Following the 2022 provincial election, the NDP remained in opposition and party leader Andrea Horwath stepped down. MPP Peter Tabuns became interim leader until the party could hold a leadership election in 2023. Stiles announced that she would run for NDP leader on September 22, 2022.^[17] During her campaign, she received endorsements from eight fellow MPPs.^[4]

During her leadership campaign, Stiles outlined five priorities for the NDP and the province.^[5] She ran on climate action by creating jobs in sustainable industries and investing in green infrastructure.^[18] She called for "true reconciliation" by protecting indigenous rights and addressing issues such as clean drinking water, treatment in the justice system and shelter.^[18] Labour was another one of her priorities, and she has stated that she would like to focus on creating jobs where workers' rights and safety are respected.^[18] Another commitment was reforming the province's electoral system and moving away from first-past-the-post.^[18] Stiles has also criticized what she perceives as the Conservatives' efforts to increase privatization of government services, and committed to improving public education, healthcare, and social security.^[18]

The NDP announced on December 5, 2022, that Stiles was the only candidate in the leadership election, and hence leader-designate.^[19][20] While several other MPPs had explored running for leader, none were able to meet the entry requirements—which included raising a $55,000 fee—before the December 5 deadline.^[4] She was scheduled to be acclaimed as leader on March 4, 2023, but the party's provincial council voted to move the date up to February 4.^[19][21][22] Premier Doug Ford congratulated Stiles in a brief statement posted to Twitter stating "I'm looking forward to many spirited debates as we both strive to make Ontario the best place to live, work and raise a family."^[23]

Stiles was formally confirmed on February 4, 2023, taking office as leader of the NDP and becoming the leader of the Official Opposition in Ontario.^[24][25]

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.^[26][27][28] 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.^{[29][30][31][32]} Jama said: "I don't plan on apologizing..."^[33] The NDP was divided over the issue.^[34] 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.^[35] In January 2025, Jama was initially told she would be allowed to run for the NDP nomination in her riding,^[36][37] but then was barred by the party and forced to run as an independent.^[38]

She led the party into the snap 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 per cent. Following the election, Stiles began a tour of the province during the summer months of 2025.^[39] On September 20, 2025, Stiles received 68 percent support in a leadership review vote during the party's provincial convention.^[40]

On November 19, 2025, Stiles was ejected from the Legislative Assembly during question period, after she described Doug Ford's government as "corrupt," while criticizing them for the Skills Development Fund scandal.^[41] In January 2026, Scarborough Southwest MPP and the party's deputy leader Doly Begum resigned her seat to run for the federal Liberals in a by-election.^[42]