On December 7, voters in six federal ridings across Quebec, Ontario, and Saskatchewan will participate in byelections, subsequent to Prime Minister Mark Carney's announcement on Sunday. This move comes after several Members of Parliament (MPs) vacated their seats for diplomatic roles, provincial politics, or retirement, contributing to a changing political landscape.

The byelections will take place in three Quebec ridings: Laurier—Sainte-Marie, Rosemont—La Petite-Patrie, and Saint-Hyacinthe—Bagot—Acton. The seats were formerly occupied by the Liberal Party, the New Democratic Party (NDP), and the Bloc Québécois, respectively. In addition, byelections are scheduled in Ontario's Brantford—Brant South and Scarborough North ridings, as well as Saskatchewan's Yorkton—Melville riding. The Conservatives previously held the seats in Yorkton—Melville and Brantford—Brant South, while Scarborough North was represented by the Liberals.

As of now, Carney’s Liberals maintain a majority government, bolstered by victories in three byelections earlier this year. Conservative Leader Pierre Pollievre urged Canadians to consider alternative policies, stating that his party's agenda emphasizes saving money, protecting jobs, and reforming the immigration system. At a news conference, Pollievre expressed his belief that the byelections present a chance for hardworking Canadians who find Carney's governance—characterized by rising costs of living—to support a party committed to fiscal responsibility.

Significantly, the byelections were prompted by the resignation of 13 MPs out of 343 since the last general election in 2025, which mandates the Prime Minister to hold elections within a designated time frame after a member’s resignation.

In the Brantford—Brant South Ontario riding, a notable twist arises as pastor Dave Carrol, a longtime Conservative, has decided to run as an independent candidate after the Conservative Party appointed Brantford Mayor Kevin Davis without a local nomination contest. This decision is seen as controversial within local party circles, with Carrol expressing disappointment over the bypass of a traditional nomination process.

Meanwhile, in the Saskatchewan riding of Yorkton—Melville, the Liberal candidate is Aaron Kienle, the Mayor of Yorkton, who faces off against Conservative candidate Nelson Pohl, a farmer. The Conservative Party has held Yorkton—Melville for over three decades, and the Liberals have not won there since the riding's formation in 1968. Previous Conservative MP Cathay Wagantall secured over 77% of the vote in the last election before resigning in August.

In Laurier—Sainte-Marie, a riding left vacant by former Environment Minister Steven Guilbeault due to policy disagreements with Carney, Guy Cormier is set to represent the Liberals. The Bloc has nominated Zumretay Arkin, a former vice-president of the World Uyghur Congress, while the NDP's choice is epidemiologist Nima Machouf.

The byelection for Saint-Hyacinthe—Bagot—Acton is also a result of political changes, with Simon-Pierre Savard-Tremblay leaving the Bloc caucus in June to run successfully for the Parti Québécois. The Liberals have nominated former provincial politician Chantal Soucy, while Caroline Emond, ex-director general of the International Dairy Federation, will represent the Bloc.

Rosemont—La Petite-Patrie was vacated by MP Alexandre Boulerice, who resigned in August for a provincial bid with Québec solidaire. The Liberals are presenting human rights advocate Jean-Sébastien Vallée, while the NDP has fielded Pierre Céré, a political activist with a history of leadership aspirations within the Parti Québécois.

The final byelection is in Scarborough North, which was left open by former Liberal MP Shaun Chen, who cited medical issues as the reason for his departure. The Liberals aim to retain the seat with accountant James Li as their candidate.

Prime Minister Carney has previously seen considerable success in byelections this year, winning crucial seats in areas such as Terrebonne, University-Rosedale, and Scarborough Southwest. Furthermore, additional Conservative seats were flipped in the later byelections held on August 31, further solidifying the Liberals’ majority government.