The following is a list of international organizations in which the United States of America officially participates.^[1]

• Agreement between the United States of America, the United Mexican States, and Canada (USMCA)
• Asian Development Bank (ADB) (nonregional member)
• Asia-Pacific Economic Cooperation (APEC)
• Association of Southeast Asian Nations (ASEAN) (dialogue partner)
• Australia Group
• Australia-New Zealand-United States Security Treaty (ANZUS)
• Bank for International Settlements (BIS)
• Black Sea Economic Cooperation Zone (BSEC) (observer)
• C5+1
• Colombo Plan (CP)
• Council of Europe (CE) (observer)
• Council of the Baltic Sea States (CBSS) (observer)
• Dominican Republic–Central America Free Trade Agreement (CAFTA-DR)
• Euro-Atlantic Partnership Council (EAPC)
• European Bank for Reconstruction and Development (EBRD)
• European Organization for Nuclear Research (CERN) (observer)
• Fédération Internationale de Football Association (FIFA)
• Group of Seven (G7)
• Group of Ten (G10)
• Group of Twenty Finance Ministers and Central Bank Governors (G20)
• Inter-American Development Bank (IADB)
• International Chamber of Commerce (ICC)
• International Criminal Police Organization (Interpol)
• International Energy Agency (IEA)
• International Energy Forum (IEF)
• International Federation of Red Cross and Red Crescent Societies (IFRCS)
• International Grains Council (IGC)
• International Hydrographic Organization (IHO)
• International Mobile Satellite Organization (IMSO)
• International Olympic Committee (IOC)
• International Organization for Standardization (ISO)
• International Red Cross and Red Crescent Movement (ICRM)
• International Telecommunications Satellite Organization (ITSO)
• International Trade Union Confederation (ITUC)
• North Atlantic Treaty Organization (NATO)
• Nuclear Energy Agency (NEA)
• Nuclear Suppliers Group (NSG)
• Organisation for Economic Co-operation and Development (OECD)
• Organization for Security and Cooperation in Europe (OSCE)
• Organization of American States (OAS)
• Pacific Community (SPC)
• Pacific Islands Forum (PIF) (partner)
• Paris Club
• Permanent Court of Arbitration (PCA)
• South Asian Association for Regional Cooperation (SAARC) (observer)
• Southeast European Cooperative Initiative (SECI) (observer)
• United Nations (UN) - Membership in the UN includes participation in the UN's Six Principal Organs: the General Assembly, Secretariat, International Court of Justice, Security Council, Economic and Social Council, and Trusteeship Council.
  • Food and Agriculture Organization (FAO)
  • International Atomic Energy Agency (IAEA)
  • International Civil Aviation Organization (ICAO)
  • International Fund for Agricultural Development (IFAD)
  • International Labour Organization (ILO)
  • International Maritime Organization (IMO)
  • International Monetary Fund (IMF)
  • International Organization for Migration (IOM)
  • International Telecommunication Union (ITU)
  • Organisation for the Prohibition of Chemical Weapons (OPCW)
  • Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO Preparatory Commission)
  • United Nations Conference on Trade and Development (UNCTAD)
  • United Nations Educational, Scientific and Cultural Organization (UNESCO)
  • United Nations High Commissioner for Refugees (UNHCR)
  • United Nations Human Rights Council (UNHRC)
  • United Nations Institute for Training and Research (UNITAR)
  • United Nations Mission for Justice Support in Haiti (MINUJUSTH)
  • United Nations Relief and Works Agency for Palestine Refugees in the Near East (UNRWA)
  • United Nations Truce Supervision Organization (UNTSO)
• Universal Postal Union (UPU)
• World Bank Group (WBG)
  • International Bank for Reconstruction and Development (IBRD)
  • International Centre for Settlement of Investment Disputes (ICSID)
  • International Development Association (IDA)
  • International Finance Corporation (IFC)
  • Multilateral Investment Guarantee Agency (MIGA)
• World Health Organization (WHO)^[2]
• World Intellectual Property Organization (WIPO)
• World Meteorological Organization (WMO)
• World Trade Organization (WTO)
• World Customs Organization (WCO)
• World Organization of the Scout Movement (WOSM)
• World Veterans Federation (WVF)
• Zangger Committee (ZC)

• International Criminal Court - Signed treaty, but did not ratify (December 31, 2000).^[3] Withdrew signature (May 6, 2002)

• United States Department of State
• Foreign policy of the United States
• Foreign relations of the United States
• United States and the United Nations
• United States Mission to the United Nations
• United States withdrawal from the United Nations

• United States of America website
  • United States Department of State