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Political Science

Provides free and subscription resource recommendations in general and various political science subfields. Includes listings of the most widely used political science data and statistical resources.

Intergovernmental Organizations (IGOs)


An international organization is a formal institution or organization requiring membership from at least three states, operates in several states, and whose members establish common rules, held together by a formal agreement. The Union of International Associations (UIA)  provides comprehensive, up-to-date, and reliable information on all international associations. It differentiates between the more than 300 international governmental organizations (IGOs) around the world, which are formal international organizations established by governments through intergovernmental agreements; and over 6000 nonstate or non-governmental organizations (NGOs) whose members are associations, individuals, and other non-state actors such as students, tourist, or professional organizations not subject to direct government control. This guide list information on the most important IGOs and links to resources that provide extended lists of IGOs. For detailed searching and lists of International Organizations use the below link for the Yearbook of International Organizations.

Because of their large numbers, this research guide does not list non-governmental organizations. For detailed listings of NGOs you should use the following resources:

The United Nations

United Nations Principal Organs


  • General Assembly - The UN General Assembly (UNGA) is the main policy-making organ of the Organization. 
  • Security Council - The Security Council has primary responsibility for the maintenance of international peace and security.
  • Economic and Social Council - ECOSOC is the principal body to promote cooperation, policy review, and debate on economic, social, environmental, and humanitarian issues, and on the implementation of internationally agreed sustainable development objectives.  
  • International Court of Justice - The International Court of Justice is the principal judicial organ of the United Nations.
  • Secretariat - The United Nations Secretariat carries out the day-to-day work of the UN as mandated by the General Assembly and the Organization's other main organs.
United Nations Regional Commissions


Major Non-UN Intergovermental Organizations

There are more than 300 recognized intergovernmental organizations around the world. The following are cited by the United Nations, the largest and most influential intergovernmental organization, as politically significant.

The red asterisk * ) indicates organizations that have received a standing invitation to participate as United Nations Observers in the sessions and the work of the UN General Assembly and maintain Permanent Offices at UN Headquarters.

General International Organizations








Latin America and the Caribbean


Middle East


North America


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