There are a variety of legal types of organizations, including corporations, governments, non-governmental organizations, political organizations, international organizations, armed forces, charities, not-for-profit corporations, partnerships, cooperatives, and educational institutions, etc.

This is an introduction to six of the world's most prominent international organizations: the United Nations, the North Atlantic Treaty Organization (NATO), the European Union (EU), the World Trade Organization (WTO), the Group of Twenty (G20), and the International Criminal Court (ICC).

What Is the Most Powerful Organization in the World? The largest and most well-known intergovernmental organization is the United Nations (UN). Governments tried to prevent more wars in 1945 after the conclusion of World War II.

There are more than 300 intergovernmental organizations around the world. The United Nations (UN) is the largest and most familiar intergovernmental organization.