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An official language is a language that is given a special legal status in a particular country, state, or other territory. Typically a nation's official language will be the one used in that nation's courts, parliament and administration.^[1] However, official status can also be used to give a language (often indigenous) a legal status, even if that language is not widely spoken. For example, in New Zealand the Māori language has official status under the Māori Language Act even though it is spoken by less than five percent of the New Zealand population.^[2] Non-national or supra-national organisations such as the United Nations and the European Union may also have official languages.

True official languages are those designated as such by a regulation or law, such as the Māori Language Act or the Welsh Language Act 1967. However many languages are considered to be de facto official languages, meaning that although a language may have no official status in a particular country, it is the most commonly used language in that country and the one usually used in official settings. One example of this is the English language in the United States. The US has no official language (although 27 US states do^[3]), but because English is used for most official matters and the most commonly spoken language, it can be considered the official language in practice if not in law.

An official language is not to be confused with a national language, although the national language may be official if given legal recognition by the government.^[4]

The practical effects of a language's 'official' designation vary, and often depend on how widely the language is spoken. In some cases only the official language(s) may be used in court, the education system or other settings, whereas in other cases official status merely allows for that language to be used. For example, the Māori Language Act allows Māori to be used in legal settings, but the vast majority of New Zealand legal proceedings are still carried out in English. In other countries in which the official language is more generally but not universally spoken, such as the Republic of Ireland and Wales, state publications and signage must be available in the official language as well as English. Official language status usually increases the likelihood that a language will be widely taught in schools, and in many cases (for example Ireland) the official language is a compulsory subject.

Official language status is often connected with wider political issues of sovereignty, cultural nationalism, and the rights of indigenous peoples and ethnic minorities. For example, the campaign to make English the de jure official language of the United States is often seen as a way of marginalising non English-speaking minorities, particularly Latinos, whereas in the Republic of Ireland the decision to make the Irish language an official language was part of a wider programme of cultural revitalisation and Gaelic nationalism. Various indigenous rights movements have sought greater recognition of their languages, often through official language status.

• List of official languages (by language)
• List of official languages by state
• List of official languages by institution
• National language

• Akira Nakanishi (1990) "Writing Systems of the World: Alphabets, Syllabaries, Pictograms", ISBN 0804816549 — the book lists official languages of the countries of the world, among other information, although it cointains errors; e.g., it names English as the official language of the United States.