An international organization (intergovernmental organization) is an organisation established by a treaty or other instrument governed by international law and possessing its own international legal personality, such as the United Nations, the World Health Organization and NATO. International organizations are composed of primarily Member states, but may also include other entities, such as other international organizations. Additionally, entities (including states) may hold observer status.
Notable examples include the United Nations (UN), Organization for Security and Co-operation in Europe (OSCE), Council of Europe (COE), International Labour Organization (ILO) and International Police Organization (INTERPOL).
The first and oldest intergovernmental organization - being established employing a treaty, and creating a permanent secretariat - is the International Telecommunication Union (founded in 1865). The first general international organization—addressing a variety of issues—was the League of Nations. The United Nations followed this model after World War II.
The role of international organizations is helping to set the international agenda, mediating political bargaining, providing a place for political initiatives and acting as catalysts for the coalition- formation. They facilitate cooperation and coordination among member nations.
International organizations typically have member states from the whole world, however in some cases organizations have geographic limitations, such as the European Union, African Union and NATO. The United Nations also has regional organizations, such as UNECE and UNECA.
The United Nations organizes its work into agencies, such as United Nations Relief Works Agency, which are generally considered as international organizations in their own right.
Additionally, the United Nations has specialized agencies which are organizations within the United Nations System, that have their member states (often nearly identical to the UN Member States) and are governed independently by them, examples include International Organizations that predate the UN, such the International Telecommunication Union, and the Universal Postal Union, as well as organizations that were created after the UN such as the World Health Organization (which was made up of regional organizations such as PAHO that predated the UN).
International Organizations are sometimes referred to as Intergovernmental Organizations (IGOs), to clarify the distinction from International nongovernmental organizations (INGOs), which are non-governmental organizations (NGOs) that operate internationally. These include international a non-profit organization such as the World Organization of the Scout Movement, International Committee of the Red Cross, Médecins Sans Frontières, and the World Economic Forum.