The 15th Canadian Parliament was in session from 7 January 1926, until 2 July 1926. The membership was set by the 1925 federal election on 29 October 1925, and it changed only somewhat due to resignations and by-elections until it was dissolved prior to the 1926 election.

The 1925 Canadian federal election was held on October 29, 1925 to elect members of the House of Commons of Canada of the 15th Parliament of Canada. The Conservative party took the most seats in the House of Commons, although not a majority. Prime Minister William Lyon Mackenzie King's Liberal Party was invited to form a minority government. Unlike the Conservative party, King's Liberals had the conditional support of the many Farmer/Progressive MPs.