This piece introduces the new Spanish edition of Henri Lefebvre’s classic The Urban Revolution, contextualizing the book within the trajectory of the French thinker and examining its principal contributions. The Urban Revolution occupies a strategic position in Lefebvre’s oeuvre, between The Right to the City and The Production of Space, functioning simultaneously as synthesis, methodological intervention, and theoretical experiment. This introduction reconstructs the intellectual and political conjuncture of its composition, marked by the crisis of Fordist-Keynesian arrangements and the reconfiguration of capitalist spatiality. The notion of “urban revolution” designates the historical transition from industrial society to urban society, understood as a process of generalized and tendentially planetary urbanization. Lefebvre’s hypothesis entails a radical displacement of analytical focus: from the city as a bounded settlement to “the urban” as a dynamic ensemble of relations, logics, and spatial practices extending across the entire territory. The introduction highlights the book’s status as a fundamental epistemological intervention, underscoring its critique of disciplinary fragmentation and “blind fields” in urban knowledge and its defense of the regressive-progressive method and transduction as strategies for apprehending emergent realities. Particular attention is devoted to key categories such as centrality, the urban fabric, socio-spatial levels, and the dialectic between city, the urban, and the industrial, as well as Lefebvre’s ambivalent assessment of planning and urbanism as ideological yet potentially transformative practices. Ultimately, the article argues that The Urban Revolution remains an indispensable resource for contemporary debates on planetary urbanization, scale, autogestion, and the politics of space.