Abstract: This article is devoted to the analysis of the current state and problems of the development of the institute of international cooperation of subjects of public control (subjects of civil society) on the example of the countries of the European Union. The authors note that the Institute of public control, which in the countries of the European Union is referred to in the context of the terms "transparency" and "participation", is the most important institution of civil society in these states, which has a long history. Due to the fact that the European states have been increasingly converging in their interaction and cooperation over the past decades (which was reflected in the creation and development of the European Union as an international intergovernmental organization), similar processes of international and interstate cooperation are taking place in the processes of interaction between subjects of public control (subjects of civil society of the national states of Europe). This cooperation is carried out both within the framework of the European Union (through the creation of European unions and associations of various types of subjects of public control), and through cooperation of these European unions and associations with other international associations and unions of subjects of public control (subjects of civil society).  A number of scientific research methods are used in the work, in particular: formal-logical; comparative-legal; historical-legal; statistical; sociological; method of analyzing specific legal situations. The authors identified and analyzed the main problems hindering international cooperation of subjects of public control (subjects of civil society) on the example of the countries of the European Union, among which the following can be distinguished: the absence of a single normative legal act in the European Union, which would consolidate the legal status and foundations of this international cooperation; weak powers as subjects of public control (subjects of civil society) in the EU countries and their European unions and associations (as well as international associations and unions in this field); weak development of the institute of international associations and unions of subjects of public control (subjects of civil society) in the world as a whole; insufficient use of modern digital technologies by these subjects both in their activities and in the processes of cooperation; the lack of unification of national legislation in this area both in the countries of the European Union and in the world as a whole. A system of measures to resolve these problems has been developed and justified.