The official languages of the United Nations are the six languages that are used in UN meetings and in which all official UN documents are written. In the six languages, four are the official language or national language of permanent members in the Security Council, while the remaining two are used due to the large number of their speakers. In alphabetical order of the Latin alphabet, they are:

Arabic (Modern Standard Arabic) – official or national language of several countries in the Middle East and North Africa, and used in the Arab world.
Chinese (Mandarin Chinese in simplified Chinese characters) – official language of the People's Republic of China.
English – majority and de facto official language of the United Kingdom, the United States and Australia, and majority (de jure) official language of Canada and New Zealand. It is also the most popular language, the most popular lingua franca, and a majority and/or official language in several other countries and territories.
French – official language of France. It is also official in Belgium, Switzerland, Canada, and several countries in Africa.
Russian – official language of the Russian Federation. It is also used in several post-Soviet states.
Spanish – official or national language in 18 countries and one territory in the Americas (mostly Latin America or Hispanic America), Spain, and Equatorial Guinea.
What are the official languages of the United Nations?
Arabic, Mandarin Chinese, English, French, Russian, Spanish