<Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> The Prime Minister of Canada (French: Premier ministre du Canada) is the primary minister of the Crown, chairman of the Cabinet, and thus Canada's head of government, charged with advising the Canadian monarch or Governor General of Canada on the exercise of the executive powers vested in them by the constitution . Not outlined in any constitutional document, the office exists only as per long - established convention (originating in Canada's former colonial power, the United Kingdom) that stipulates the monarch's representative, the governor general, must select as prime minister the person most likely to command the confidence of the elected House of Commons; this individual is typically the leader of the political party that holds the largest number of seats in that chamber . Canadian prime ministers are styled as The Right Honourable (French: Le Très Honorable), a privilege maintained for life . </P> <P> The current, and 23rd, Prime Minister of Canada is the Liberal Party's Justin Trudeau, who was appointed on November 4, 2015, by Governor General David Johnston, following the general election that took place that year . </P> <P> The position of prime minister is not outlined in any Canadian constitutional document and is mentioned only in passing in the Constitution Act, 1982, and the Letters Patent, 1947 issued by King George VI . The office and its functions are instead governed by constitutional conventions and modelled on the same office in the United Kingdom . </P>

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