This module has been organized to provide a comprehensive legal/economical understanding on International Organizations. It is a threefold module: Firstly, the key aspects of the International organizations legal theory will be studied and analysed: Introduction to International Organizations Law, IO legal Personality, IO ability to practice legal acts; Implicit Powers; Relations with Member States; Relation with non-Member States; Relation with other IO; IO normative Powers; and IO legal control and oversight. After that, the world will be divided in 7 key areas: Arctic, North America, Central and South America, Western Europe, Africa, Central Asia, South Asia and Oceania. In which area will be studied the economic flows and dynamics and the key regional International organizations. Finally, a set of IO will be studied as a practical and legal application of the two previous chapters. Among them the United Nations, the World Bank, The International Monetary Fund, The ASEAN, The European Union, and other regional IO will be studied.