The Statute of Autonomy of Catalonia (Catalan: Estatut d'Autonomia de Catalunya; also Statute of Sau, Estatut de Sau, after the location where the statute was first made) is a constitutional law defining the nationality of Catalonia as an autonomous community within the Kingdom of Spain. It was promulgated on 18 September 1979. It is one of seventeen such statutes granted, in various forms and capabilities, to the different autonomous communities of Spain since the Spanish transition to democracy of the 1970s.
On 18 June 2006 a referendum approved the adoption of a new statute that expanded the authority of the Catalan government which had been passed by the Spanish Parliament. It became effective on 9 August 2006, replacing the Statute of 1979.