Canadian Prime Minister Justin Trudeau resigns as party leader

[Bernardo de La Paz]

10. And in 20th century, Canadian PM William Lyon Mackenzie King and Pierre Trudeau (the father)

But yeah, you are basically right. Fickle electorates. Though 10 years is a good stretch by any measure.

Canada's four longest-serving prime ministers:
William Lyon Mackenzie King; 21 years, 154 days: (1921–1926; 1926–1930; 1935–1948)
Sir John A. Macdonald; 18 years, 359 days (19th century)
Pierre Trudeau; 15 years, 164 days
Wilfred Laurier; 15 years, 86 days (late 19th, early 20th)
(only Laurier served it consecutively)


Justin Trudeau is the 7th longest serving and would have beaten Harper in 6th place if he had continued to an October election. He led the longest duration minority Parliament in Canadian history (2021-current).