There seems to exist an intimate link between the dialectical method and the revolutionary theory: not by chance, the high period of revolutionary thinking in the twentieth century, the years 1905-1925, are also those of some of the most interesting attempts to use the Hegelo-Marxist dialectics as an instrument of knowledge and action. Let me try to illustrate the connection between dialectics and revolution in the thought of three distinct Marxist figures: Leon D. Trotsky, Vladimir I. Lenin and Georg Lukács.