The 24th Canadian Parliament was in session from May 12, 1958, until April 19, 1962. The membership was set by the 1958 federal election on March 31, 1958, and it changed only somewhat due to resignations and by-elections until it was dissolved prior to the 1962 election. It was controlled by a Progressive Conservative Party majority, which won the largest majority in Canadian history, under Prime Minister John Diefenbaker and the 18th Canadian Ministry. The Official Opposition was the Liberal Party, led by Lester B. Pearson. There were five sessions of the 24th Parliament.