Lester Bowles "Mike" Pearson PC OM CC OBE (23 April 1897 – 27 December 1972) was a Canadian scholar, statesman, diplomat, and politician who served as the 14th prime minister of Canada from 1963 to 1968.

Born in Newtonbrook, Ontario (now part of Toronto), Pearson pursued a career in the Department of External Affairs. He served as Canadian ambassador to the United States from 1944 to 1946 and secretary of state for external affairs from 1948 to 1957 under Liberal Prime Ministers William Lyon Mackenzie King and Louis St. Laurent. He narrowly lost the bid to become secretary-general of the United Nations in 1953. However, he won the Nobel Peace Prize in 1957 for organizing the United Nations Emergency Force to resolve the Suez Canal Crisis, which earned him attention worldwide. After the Liberals' defeat in the 1957 federal election, Pearson easily won the leadership of the Liberal Party in 1958. Pearson suffered two consecutive defeats by Progressive Conservative Prime Minister John Diefenbaker in 1958 and 1962, only to successfully challenge him for a third time in the 1963 federal election. Pearson would win re-election in 1965.

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