"Institutions Supporting the Development of the Three Seas Initiative region for Faster and More Effective Social, Political and Economic Integration, Following the Concept of the Community of Nations by the Venerable Robert Schuman" is an attempt to contribute to the discussion and to propose concrete practical solutions to support the Three Seas Initiative (3SI, Three Seas Initiative). An important goal to be achieved is to begin to operationalize and work on concrete solutions to support the formation of stable institutions for the Three Seas Initiative and the Three Seas Initiative region. It is important and noteworthy that the solutions presented by us are in line with the spirit of the Community of Nations preserving its subjectivity. An important inspiration for us is the figure of the Venerable Servant of God Robert Schuman and his concept of Community of European Nations. However, we would like to present not theoretical and ideological assumptions, but practical solutions in the social, economic and political space.