The Langevin Block (French: Édifice Langevin, IPA: [lɑ̃ʒvɛ̃]) is an office building facing Parliament Hill in Ottawa, Canada. As the home of the Privy Council Office and Office of the Prime Minister, it is the working headquarters of the executive branch of the Canadian government. Accordingly, the term Langevin Block is sometimes used as a metonym for the Prime Minister's Office.