This is a review of a book of sociologist from St. Petersburg A.E. Kuteynikov “International intergovernmental organizations: a theoretical and sociological analysis”. The main items of the sociological approach to the study of international intergovernmental organizations are described. It allows to study IGO as social organisms which have their own specific structure while acting in the social space and social time. The most interesting author's conclusions about relate to the structure of IGO which includes macro-, meso- and micro-levels.