The 19th Canadian Parliament was in session from 16 May 1940, until 16 April 1945. The membership was set by the 1940 federal election on 26 March 1940, and it changed only somewhat due to resignations and by-elections until it was dissolved prior to the 1945 election.

The 1940 Canadian federal election was held March 26, 1940, to elect members of the House of Commons of Canada of the 19th Parliament of Canada. Prime Minister William Lyon Mackenzie King's Liberal Party was re-elected to their second consecutive majority government.