Prorogation is the end of a parliamentary session in the Parliament of Canada and the parliaments of its provinces and territories. It differs from a recess or adjournment, which do not end a session; and differs from a complete dissolution of parliament, which ends both the session and the entire parliament, requiring an election for the House of Commons in the bicameral federal parliament and the singular legislative chamber of the unicameral provincial parliaments.

The 40th Canadian Parliament was in session from November 18, 2008 to March 26, 2011. It 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. 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.