The 1958 Canadian federal election was held to elect members of the House of Commons of Canada of the 24th Parliament of Canada on March 31, 1958, just nine months after the 23rd election. It transformed Prime Minister John Diefenbaker's minority into the largest majority government in Canadian history and the second-largest percentage of the popular vote. Although the Tories would surpass their 1958 seat total in the 1984 election, the 1958 result remains unmatched both in terms of percentage of seats (78.5%) and the size of the government majority over all opposition parties. Voter turnout was 79.4%.

The 1957 Canadian federal election was held June 10, 1957, to select the 265 members of the House of Commons of Canada of the 23rd Parliament of Canada. In one of the greatest upsets in Canadian political history, the Progressive Conservative Party, led by John Diefenbaker, brought an end to 22 years of Liberal rule, as the Tories were able to form a minority government despite losing the popular vote to the Liberals.