This article deals with the relationships between Auguste Comte and madness. Beginning with a description of Comte's own experience of madness, we show then that madness has an important status inside Comte's positive system. It stands as an " empirical proof " of the three states law and as a central element of his inquiry into pathology and the link between biology and sociology. We conclude with a study of the ambiguous behaviour of Comte toward the psychiatric science of his time. He criticized it vivaciously but at the same time considered that a " regenerate " psychiatry should be a key element inside a positivist society.Cet article cherche à explorer les liens entretenus par Auguste Comte avec la folie. En revenant d'abord sur l'exp...