John George Diefenbaker (; September 18, 1895 – August 16, 1979) was the 13th Prime Minister of Canada, serving from June 21, 1957, to April 22, 1963. He was the only Progressive Conservative (PC or Tory) party leader between 1930 and 1979 to lead the party to an election victory, doing so three times, although only once with a majority of seats in the Canadian House of Commons.