English is the most widely used official language in international relations due to its historical and political dominance.

The United Nations recognizes six official languages: Arabic, Chinese, English, French, Russian, and Spanish.

French is the official language of the European Union, although English and German are also widely used.

English is the official language of the African Union, although French and Arabic are also widely used.

English is the official language of ASEAN, although the member states also use their own national languages.

Spanish is the official language of the OAS, although English and Portuguese are also used.

English is the official language of the Commonwealth of Nations, although other languages are also used by member states.

English is the official language of the IMF, although French and Spanish are also used.

English is the official language of the World Bank, although French and Spanish are also used.

English is the official language of the WTO, although French and Spanish are also used.

English is the official language of UNESCO, although French and Spanish are also used.

English is the official language of the IAEA, although French and Spanish are also used.

English is the official language of ICAO, although French and Spanish are also used.

English is the official language of the IMO, although French and Spanish are also used.

French is the official language of the UPU, although English and Spanish are also used.