Fondazione delle Nazioni Unite

The United Nations System consists of the United Nations' six principal bodies (the General Assembly, the Security Council, the Economic and Social Council (ECOSOC), the Trusteeship Council, the International Court of Justice (ICJ), and the Secretariat), and the specialized agencies and related organizations. The UN System includes subsidiary bodies such as the separately administered funds and programmes, research and training institutes, and other subsidiary entities. Some organizations predate the founding of the United Nations in 1945 and were inherited after the dissolution of the League of Nations.

The executive heads of some of the United Nations System organizations, and the World Trade Organization, which is not formally part of the United Nations System, have seats on the United Nations System Chief Executives' Board for Coordination (CEB). This body, chaired by the secretary-general of the United Nations, meets twice a year to coordinate the work of the organizations of the United Nations System.