1984 Canadian federal election

The 1984 Canadian federal election was held on September 4, 1984, to elect members to the House of Commons of the 33rd Parliament of Canada, following the dissolution of the House on July 9. The Progressive Conservative Party, led by Brian Mulroney, won a landslide victory, defeating the incumbent governing Liberal Party led by Prime Minister John Turner. The Progressive Conservatives won 211 seats, the most seats in the House in Canadian political history, and regained power for the first time since 1979. This was the first election since 1958 in which the Progressive Conservatives won a majority government, and is also the only time since 1958 that Canada's governing party received an actual majority of votes cast.

Mulroney's victory came as a result of his building of a 'grand coalition' that comprised social conservatives from the West, Red Tories from the East, Quebec nationalists, and fiscal conservatives. Winning 74.8 percent of the seats in the House of Commons meant he won the second-largest percentage of seats in Canadian history, with only Progressive Conservative Prime Minister John Diefenbaker's triumph in the 1958 federal election, at 78.5 percent, being higher. This was the last time that the winning party won every province and territory and the last time that the winning party received over 50 percent of the national popular vote. The Liberals suffered what at that time was the worst defeat for a governing party at the federal level (in terms of percentage of seats), until the new record would be set in 1993 by the Progressive Conservatives themselves. The NDP lost a single seat in the House of Commons.

The election marked the end of the Liberals' long dominance of federal politics in Quebec, a province which had been the bedrock of Liberal support for almost a century, and the beginning of a nine-year hold on power by the Progressive Conservatives. The Liberals would not win a majority of Quebec seats again until three decades later in 2015. The Progressive Conservatives would later be reelected with a majority in 1988 before collapsing entirely in 1993.