John George Diefenbaker (; September 18, 1895 – August 16, 1979) was the 13th prime minister of Canada from 1957 to 1963. Between 1930 and 1979, he was the only federal Progressive Conservative (PC or Tory) leader to lead the party to an election victory, doing so three times, although only once with a majority of seats in the House of Commons of Canada.