Official Languages Act, Official Language Act, or Official Languages Ordinance may refer to laws in different countries relating to an official language or languages:

Canada the Official Languages Act (Canada) passed by the federal Parliament to enshrine official bilingualism; the Official Languages Act (New Brunswick); the Official Languages Act (Northwest Territories); the Official Language Act (Quebec), passed to ensure that French retained its primary status.

Hong Kong the Official Languages Ordinance passed in Hong Kong in 1974 to bring the English and Chinese languages to equal status as official languages of the territory;

India the Official Languages Act, 1963 passed to indefinitely extend the status of English as an official language of India;

Ireland the Official Languages Act 2003 passed to promote the provision of state services in Irish;

South Africa Use of Official Languages Act, 2012

Sri Lanka Official Language Act No. 33 of 1956 (Ceylon), which replaced English with Sinhala as the official language of the country.

Wales National Assembly for Wales (Official Languages) Act 2012