The Prime Minister of Canada is the head of the Canadian government. Operating under the Westminster system, the prime minister needs the support of a majority of the elected House of Commons. Therefore, the prime minister is typically a Member of Parliament (MP) and leads either the largest party or a coalition of parties. As first minister, the prime minister chooses the ministers who make up the Cabinet.
The Nickle Resolution of 1919 established a policy against awarding aristocratic or chivalric titles to Canadians by the Canadian Sovereign.
In 1925, after losing his seat in the federal election, William Lyon Mackenzie King governed briefly without a seat in the House of Commons before winning a by-election.
In 1925, the concept of forming a coalition government with other parties was explored as a strategy to maintain confidence in a minority government situation.
In 1941, former Prime Minister R. B. Bennett was granted the title of Viscount Bennett by King George VI, marking a departure from the usual practice after the Nickle Resolution.
Similarly, in 1945, Mackenzie King again found himself governing without a seat after losing in the election but regained one through a by-election shortly after.
The Letters Patent, 1947, issued by King George VI, also makes references to the office of the prime minister.
Pierre Trudeau began his first term as prime minister in 1968, a period during which he strengthened the Prime Minister's Office (PMO).
Pierre Trudeau returned to the position of Prime Minister in 1980 after a brief period out of office.
The Constitution Act, 1982 includes mentions of the position of prime minister, though it doesn't define the role.
In 1984, John Turner succeeded Pierre Trudeau as Liberal Party leader and became prime minister, despite initially not holding a seat in the House of Commons. He later won a seat in the following election, but the Liberal Party lost power.
A 2007 amendment to the Canada Elections Act set a four-year limit on the term of a Parliament, with elections on the third Monday of October in the fourth year.
A 2008 survey revealed a misunderstanding among Canadians, with 51% believing they directly elect the prime minister, despite the position being appointed by the governor general.
The 2014 Reform Act formalized procedures for caucuses to initiate leadership reviews and choose interim leaders, enhancing the accountability of the prime minister to their party's MPs.
On November 4, 2015, Justin Trudeau assumed office as Prime Minister of Canada after the Liberal Party secured a majority government in the federal election.
In 2019, Trudeau's Liberal Party won a plurality of seats in the federal election, resulting in a minority government.
In 2021, the Liberal Party under Trudeau again secured a plurality in the federal election, leading to another minority government.
As of April 2024, the annual salary for the Prime Minister of Canada is $406,200, comprising an MP's salary and an additional prime ministerial allowance.
On January 6, 2025, Justin Trudeau declared his intention to step down as both the leader of the Liberal Party and Prime Minister of Canada.
March 9, 2025 was set as the date for the selection of Trudeau's replacement and his departure from his current roles.