Institutionalist movement is a heterogeneous field of analysis and intervention that seeks to investigate the influence of institutions and power on relations between individuals and collectives and is also known as institutional analysis. The aim of this entry is to present the history and main concepts of institutionalist movement. In the historical context, institutionalist movement initially originated in mental health in France, with alternative practices to psychiatry, soon spreading to other European countries with radical psychiatry and the anti-asylum movement. It was not restricted to mental health, spreading to other fields, such as the study and intervention in educational institutions, prisons, workplaces, etc. In summary, there are four main traditions of institutionalist movement: group and institutional psychoanalysis by René Kaës, Enrique Pichon-Rivière, and José Bleger; psychosociology of Eugène Enriquez’s team; socioanalysis by René Lourau and Georges Lapassade; and schizoanalysis by Gilles Deleuze, Félix Guattari, and Gregorio Baremblitt.