Who was the Prime Minister of Canada in the 1950's?

Louis Stephen St. Laurent and John George Diefenbaker were the Prime Ministers of Canada in the 1950's.

St. Laurent was the 12th Prime Minister of Canada from 1948 November 15 to 1957 June 21.

Diefenbaker was the 13th Prime Minister of Canada from 1957 June 21 to 1963 April 22.