The aim of this paper is to present the economic sociology of Vilfredo Pareto. It is argued that Pareto represents a mode of thinking that has not been used in economic sociology and barely considered in the other branches of sociology. The habitual bifurcation of Pareto into the economist and the sociologist is rejected. Pareto stresses the non-logical parts of human life, and he provides empirical examples of this in his writing. He was occupied with the dynamics in society as a result mainly of non-logical actions. It is shown how one may speak of a distinctly Paretian economic sociology, which primarily has its origin in his theoretical discussions. It is also shown that Pareto conducted empirical studies drawing from his version of economic sociology. Included is a presentation, as well as a discussion of Pareto's idea of rentiers and speculators, which is followed up by a more general discussion of economic types in the market.