The 40th Canadian Parliament was in session from November 18, 2008 to March 26, 2011, and was the last Parliament of the longest-running minority government in Canadian history that began with the previous Parliament. The membership of its House of Commons was determined by the results of the 2008 federal election held on October 14, 2008. Its first session was then prorogued by the Governor General on December 4, 2008, at the request of Prime Minister Stephen Harper, who was facing a likely no-confidence motion and a coalition agreement between the Liberal party and the New Democratic Party with the support of the Bloc Québécois (see 2008–2009 Canadian parliamentary dispute). Of the 308 MPs elected at the October 14, 2008 general election, 64 were new to Parliament and three sat in Parliaments previous to the 39th: John Duncan, Jack Harris, and Roger Pomerleau.

There were three sessions of the 40th Parliament.

On March 25, 2011, the House of Commons passed a Liberal motion of non-confidence by a vote of 156 to 145, finding the Conservative Cabinet in contempt of parliament, an unprecedented finding in Canadian and Commonwealth parliamentary history. On March 26, 2011, Prime Minister Stephen Harper subsequently asked Governor General David Johnston to dissolve parliament and issue a writ of election.

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