Commonwealth of Nations: English
Community of Portuguese Language Countries (CPLP): Portuguese
Francophonie: French
International Criminal Court (ICC): Arabic, Chinese, English, French, Russian, and Spanish. (English and French are working languages.)
International Labor Organization (ILO/OIT): English, French and Spanish.
International Monetary Fund (IMF/FMI): English (Conferences also have simultaneous interpretation into French, Spanish, Arabic, Japanese, Chinese and Russian.)
International Olympic Committee (IOC/CiO): English and French. Other working languages: Spanish, German, Russian, Arabic (the last two only during the annual Session.)
International Telecommunication Union (ITU): English, French and Spanish.
Inter-Parliamentary Union (IPU) French and English (Conferences also have simultaneous interpretation into Spanish and Arabic.)
Latin Union: Catalan, French, Italian, Portuguese, Romanian and Spanish.
Organisation for Economic Co-operation and Development (OECD/OCDE): English, French
Organization of Ibero-American States (OEI): Spanish and Portuguese.
Organization of the Islamic Conference (OIC/OCI): Arabic, English and French.
United Nations (UN/ONU): Under the Charter, the official languages are Chinese, English, French, Russian, Spanish as well as Arabic which was added in 1973.
Universal Postal Union (UPU): French (official), English (working). Other languages translated: Arabic, Chinese, Portuguese, Russian, Spanish, German.
World Bank (WB/BM): English (Conferences also have simultaneous interpretation into French, Spanish, Arabic, Chinese and Russian.)
World Trade Organization (WTO/OMC): English, French and Spanish.
http://en.wikipedia.org/wiki/List_of_official_languages_by_institution
Community of Portuguese Language Countries (CPLP): Portuguese
Francophonie: French
International Criminal Court (ICC): Arabic, Chinese, English, French, Russian, and Spanish. (English and French are working languages.)
International Labor Organization (ILO/OIT): English, French and Spanish.
International Monetary Fund (IMF/FMI): English (Conferences also have simultaneous interpretation into French, Spanish, Arabic, Japanese, Chinese and Russian.)
International Olympic Committee (IOC/CiO): English and French. Other working languages: Spanish, German, Russian, Arabic (the last two only during the annual Session.)
International Telecommunication Union (ITU): English, French and Spanish.
Inter-Parliamentary Union (IPU) French and English (Conferences also have simultaneous interpretation into Spanish and Arabic.)
Latin Union: Catalan, French, Italian, Portuguese, Romanian and Spanish.
Organisation for Economic Co-operation and Development (OECD/OCDE): English, French
Organization of Ibero-American States (OEI): Spanish and Portuguese.
Organization of the Islamic Conference (OIC/OCI): Arabic, English and French.
United Nations (UN/ONU): Under the Charter, the official languages are Chinese, English, French, Russian, Spanish as well as Arabic which was added in 1973.
Universal Postal Union (UPU): French (official), English (working). Other languages translated: Arabic, Chinese, Portuguese, Russian, Spanish, German.
World Bank (WB/BM): English (Conferences also have simultaneous interpretation into French, Spanish, Arabic, Chinese and Russian.)
World Trade Organization (WTO/OMC): English, French and Spanish.
http://en.wikipedia.org/wiki/List_of_official_languages_by_institution