Official Languages Act, 1963 in the context of "Languages of India"

Languages of India belong to several language families, the major ones being the Indo-Aryan languages spoken by 78.05% of Indians and the Dravidian languages spoken by 19.64% of Indians; both families together are sometimes known as Indic languages. Languages spoken by the remaining 2.31% of the population belong to the Austroasiatic, Sino–Tibetan, Tai–Kadai, Andamanese, and a few other minor language families and isolates. According to the People's Linguistic Survey of India, India has the second highest number of languages (780), after Papua New Guinea (840). Ethnologue lists a lower number of 456.

Article 343 of the Constitution of India stated that the official language of the Union is Hindi in Devanagari script, with official use of English to continue for 15 years. Opposition to increased Hindi usage in South India led to the passage of the Official Languages Act in 1963, amending the constitution to allow for the continuation of English alongside Hindi in the Indian government indefinitely. The form of numerals to be used for the official purposes of the Union are "the international form of Indian numerals", which are referred to as Arabic numerals in most English-speaking countries. Despite some misconceptions, Hindi is not the national language of India; the Constitution of India does not give any language the status of national language.