How is the Prime Minister chosen?

The Prime Minister of Canada is selected through a two-step process rooted in the Westminster parliamentary system: party leadership selection by a political party, followed by appointment by the Governor General after the party wins the most seats in a federal election. The Prime Minister is not directly elected by the public; instead, voters elect Members of Parliament, and the Governor General calls on the leader of the party most likely to command the confidence of the House of Commons to form government.

Each major political party selects its leader through a leadership election. Modern Canadian leadership elections use various forms of weighted point systems, one-member-one-vote ballots, or delegated-convention voting. The Liberal Party leadership election of March 9, 2025 selected Mark Carney as leader (and as Prime Minister after Justin Trudeau resigned). The Conservative Party of Canada leadership election of September 10, 2022 selected Pierre Poilievre. The New Democratic Party leadership election of March 1, 2017 selected Jagmeet Singh.

After a federal election (or after a Prime Minister resigns), the Governor General appoints a Prime Minister who can command the confidence of the House of Commons. Convention dictates that the Governor General first call on the leader of the party with the most seats; in a clear majority government, the new Prime Minister is sworn in within a few days. In a minority government (where no party has a majority of seats), the Governor General may call on either the incumbent Prime Minister (who has the right to first attempt) or the leader of the largest opposition party, depending on circumstances.

Mid-term Prime Minister changes are common in Canadian history. When a Prime Minister resigns, retires, or loses a leadership review, the outgoing party usually selects a successor through a leadership election (Trudeau-Carney 2025, Chrétien-Martin 2003, Mulroney-Campbell 1993, Diefenbaker-Stanfield 1967, Pearson-Trudeau 1968, Trudeau-Turner 1984). The new leader becomes Prime Minister immediately if the same party still holds confidence in the House of Commons, then typically calls a federal election to seek their own mandate.