There follows a necessarily limited list of large international organizations, grouped together by continent. Each institution is followed by a list of its official languages. Not all of those languages are necessarily used at all meetings. Another point to be borne in mind is that international organizations are grouped into larger "systems" i.e. the UN system, the co-ordinated institutions sector, the European Union institutions. Each system has its own official languages: Arabic, Chinese, English, French, Russian and Spanish in the case of the UNO; English and French in the coordinated institutions (CE, ESA, OECD, NATO, WEU); Danish, Dutch, English, Finnish, French, German, Greek, Italian, Portuguese, Spanish and Swedish for the European Union institutions.
AFRICA
| ADB (African Development Bank), Abidjan | |
| English, French | |
| ECA (Economic Commission for Africa), Addis-Ababa |
UNO |
| English, French (occasionally Spanish) | |
| HABITAT (United Nations Division for Human Habitat), Nairobi |
UNO |
| Arabic, English, French, Russian, Spanish | |
| OAU (Organization of African Unity), Addis-Ababa | |
| Arabic, English, French | |
| UNEP (United Nations Environment Program), Nairobi |
UNO |
| Arabic, English, French, Russian, Spanish |
AMERICAS
| ECLAC (Economic Commission for Latin America and the Caribbean), Santiago de Chile | UNO |
| English, French, Spanish | |
| IADB (Interamerican Development Bank), Washington | |
| English, French, Portuguese, Spanish | |
| ICAO (International Civil Aviation Organization), Montreal | |
| English, French, Russian, Spanish (also Arabic and Chinese) | |
| IMF (International Monetary Fund), Washington | |
| Arabic, Chinese, English, French, German, Portuguese, Spanish | |
| INTELSAT (International Telecommunications Satellite Organization), Washington | |
| English, French, Spanish | |
| OAS (Organization of American States), Washington | |
| English, French, Portuguese, Spanish | |
| PAHO (Pan American Health Organization), Washington | |
| English, Spanish (also French and Portuguese) | |
| UNO (United Nations Organization), New York | |
| Arabic, Chinese, English, French, Russian, Spanish |
ASIA
| ESCAP (Economic and Social Commission for Asia and the Pacific), Bangkok |
UNO |
| Chinese, English, French, Russian | |
| SPC (South Pacific Commission), Noumea | |
| English, French |
EUROPE
| CE (Council of Europe), Strasbourg |
Coordinated institutions |
| English, French (sometimes Dutch, German, Italian, Russian, Spanish and, occasionally, Eastern European languages) | |
| CERN (European Organization for Nuclear Research), Geneva | |
| English, French | |
| CEU (Commission of the European Union), Brussels |
EU |
| Danish, Dutch, English, Finnish, French, German, Greek, Italian, Portuguese, Spanish, Swedish | |
| CICR (International Red Cross Committee), Geneva | |
| French (Arabic, English, Farsi, German, Spanish) | |
| ECJ (European Court of Justice), Luxembourg |
EU |
| Danish, Dutch, English, Finnish, French, German, Greek, Italian, Portuguese, Spanish, Swedish | |
| EP (European Parliament), Luxembourg, Brussels and Strasbourg |
EU |
| Danish, Dutch, English, Finnish, French, German, Greek, Italian, Portuguese, Spanish, Swedish | |
| EPO (European Patent Office), Munich | |
| English, French, German | |
| ESA (European Space Agency), Paris |
Coordinated institutions |
| English, French, German and sometimes Italian | |
| EUROCONTROL, Brussels | |
| English, French, German, and sometimes Dutch, Greek, Hungarian, Portuguese, Turkish, Spanish, Italian and a Scandinavian booth | |
| FAO (United Nations Food and Agriculture Organization), Rome |
UNO |
| Arabic, Chinese, English, French, Russian, Spanish | |
| IAEA (International Atomic Energy Agency), Vienna |
UNO |
| Arabic, Chinese, English, French, Russian, Spanish | |
| IFAD (International Fund for Agricultural Development), Rome |
UNO |
| Arabic, English, French, Spanish | |
| ILO (International Labour Office), Geneva |
UNO |
| Arabic, Chinese, English, French, German, Japanese, Russian, Spanish | |
| IMO (International Maritime Organization), London |
UNO |
| Arabic, Chinese, English, French, Russian, Spanish | |
| ITU (International Telecommunications Union), Geneva |
UNO |
| Arabic, Chinese, English, French, Russian, Spanish | |
| NATO (North Atlantic Treaty Organization), Brussels |
Coordinated institutions |
| English, French (Russian) | |
| OECD (Organization for Economic Cooperation and Development), Paris | |
| English, French |
|
| OSCE (Organization for Security and Cooperation in Europe), Vienna | |
| English, French, German, Italian, Spanish and Russian | |
| UNESCO (United Nations Education, Science and Culture Organization), Paris |
UNO |
| Arabic, Chinese, English, French, Russian, Spanish | |
| UNIDO (United Nations Industrial Development Organization), Vienna | |
| Arabic, Chinese, English, French, Russian, Spanish |
UNO |
| UNO (United Nations Organization), Geneva, Vienna |
UNO |
| Arabic, Chinese, English, French, Russian, Spanish | |
| UPU (Universal Postal Union), Berne | |
| Arabic, English, French, Portuguese, Russian, Spanish | |
| WCU (World Customs Union), Brussels | |
| English, French, sometimes Arabic, Russian and Spanish | |
| WEU (Western European Union), Brussels, Paris | |
| English, French (occasionally Dutch, German, Italian, Spanish) | |
| WHO (World Health Organization), Geneva |
UNO |
| Arabic, Chinese, English, French, Russian, Spanish | |
| WIPO (World Intellectual Property Organization), Geneva |
UNO |
| Arabic, Chinese, English, French, Russian, Spanish | |
| WMO (World Meteorological Organization), Geneva |
UNO |
| Arabic, Chinese, English, French, Russian, Spanish | |
| WTO (World Tourism Organization), Madrid | |
| English, French, Russian, Spanish | |
| WTO (World Trade Organization), Geneva | |
| English, French, Spanish |
