The Bloc Québécois (BQ) is a federal political party in Canada that defines itself as devoted to the promotion of sovereignty for Quebec. As such, it campaigns only within the province during elections. It holds as its goal the "defence of the interests of all Québécois in Ottawa"^{[citation needed]} (notably by promoting, in the federal parliament, the consensus of the National Assembly of Quebec).

The Bloc Québécois has close relations with the Parti Québécois (PQ, whose members are known as "Péquistes"), the provincial party that advocates the independence of Quebec from Canadian Confederation, but the two are not linked organizationally. Members and supporters of the Bloc Québécois are known as "Bloquistes" [blɑˈkist(s)]. The party itself is sometimes known as the "BQ". English-speaking Canadians commonly refer to the BQ as "the Bloc".

The Bloc Québécois is supported by a wide range of voters in Quebec, from large sections of organized labour to more conservative rural voters.

The Bloc is a rare example of a major Western party that advocates the separation of a region critical to national politics. The Bloc is currently the third largest party in the Canadian House of Commons.