Revolutionary Catalonia was the period in which the autonomous region of Catalonia in northeast Spain was controlled or largely influenced by various anarchist, communist, and socialist trade unions, parties, and militias of the Spanish Civil War era. Although the constitutional Catalan institution of self-government, the Generalitat of Catalonia, remained in power and even took control of most of the competences of the Spanish central government in its territory, the trade unions were de facto in command of most of the economy and military forces, which includes the Confederación Nacional del Trabajo which was the dominant labor union at the time and the closely associated Federación Anarquista Ibérica. The Unión General de Trabajadores, the POUM and the Unified Socialist Party of Catalonia were also prominent.

The Autonomous Region of Catalonia was established after the grant of self-government to Catalonia during the Second Spanish Republic (1931–1939), becoming an autonomous region within the Spanish Republic. The Generalitat of Catalonia was the institution in which the autonomous government of Catalonia was organized, it was established in order to replace the Catalan Republic proclaimed during the events of the proclamation of the Spanish Republic.