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.

Tragic Week was a series of violent confrontations between the Spanish army and anarchists, freemasons, socialists and republicans of Barcelona and other cities in Catalonia, Spain, during the last week of July 1909. It was caused by the calling-up of reserve troops by Premier Antonio Maura to be sent as reinforcements when Spain renewed military-colonial activity in Morocco on 9 July, in what is known as the Second Rif War. Many of these reservists were the only breadwinners for their families, while the wealthy were able to hire substitutes. The figureheads most associated with the unrest were Alejandro Lerroux and Francisco Ferrer.