- The North Atlantic Treaty Organization (NATO) is a political and military alliance of countries from North America and Europe. It was established in 1949 to counter the Soviet Union and its allies. NATO members agree to come to the aid of any member that is attacked.
- The Warsaw Pact was a military alliance of countries from Eastern Europe and the Soviet Union. It was established in 1955 in response to NATO. The Warsaw Pact was dissolved in 1991.
- The Shanghai Cooperation Organization (SCO) is a regional security organization that includes China, Russia, Kazakhstan, Kyrgyzstan, Tajikistan, and Uzbekistan. It was established in 2001 to promote cooperation in the fields of security, economics, and culture.
- The Association of Southeast Asian Nations (ASEAN) is a regional economic and political organization that includes Brunei, Cambodia, Indonesia, Laos, Malaysia, Myanmar, the Philippines, Singapore, Thailand, and Vietnam. It was established in 1967 to promote economic cooperation and regional stability.
- The African Union (AU) is a continental organization that includes all of the countries of Africa. It was established in 2002 to promote unity, cooperation, and development in Africa.