An analytical study of revolutionary movements, examining the psychological forces that drive social upheaval and collective change. In The Psychology of Revolution, Gustave Le Bon extends his influential study of crowd behaviour into the specific conditions of political transformation. Drawing upon historical examples-most notably the French Revolution-he examines how belief, emotion, and collective identity interact to produce periods of rapid and often unpredictable change. Revolutions, in his account, are not solely the result of rational programmes or material conditions, but are shaped by underlying psychological currents that operate beneath conscious intent. Le Bon considers the formation of revolutionary doctrines, the role of leaders and symbols, and the persistence of belief even in the face of contradiction. He observes that once established, collective ideas acquire a force independent of individuals, guiding action through suggestion, imitation, and emotional contagion. The result is a framework in which social movements can be understood not only in political terms, but as expressions of shared psychological states. Written in the early twentieth century, this work complements Le Bon's broader contributions to social psychology and remains relevant to the study of mass movements and ideological change. The Psychology of Revolution offers a measured and systematic account of the forces that shape collective behaviour, providing context for both historical and contemporary analysis.