As of 2025^[update], 22 languages have been classified as scheduled languages under the Eighth Schedule to the Constitution of India. There is no national language of India.

While the constitution was adopted in 1950, article 343 declared that Hindi would be the official language and English would serve as an additional official language for a period not exceeding 15 years. Article 344(1) defined a set of 14 regional languages which were represented in the Official Languages Commission. The commission was to suggest steps to be taken to progressively promote the use of Hindi as the official language of the country. The Official Languages Act, 1963, which came into effect on 26 January 1965, made provision for the continuation of English as an official language alongside Hindi.

The official languages of British India before independence were English, Hindustani and other Indian vernaculars, with English being used for purposes at the central level. The origins of official Hindi usage traces back to the late 19th century. In 1881, Hindi replaced Urdu as the official language of Bihar; and in 1900, MacDonnell issued an order, which allowed the “permissive — but not exclusive — use” of Devanagari for Hindustani language in the courts of North-Western Provinces.

Following independence, the Constituent Assembly remained divided on the language issue, with some like R. V. Dulekar and Seth Govind Das favouring declaring Hindi written in Devanagari the national language of India immediately, while within the camp favouring Hindi there were divisions over whether the script of the language should be Devanagari or Roman, whether Hindustani with both Devanagari and Urdu scripts be retained, and whether the numerals should be international or Devanagari. Meanwhile, some like Frank Anthony, T A Ramalingam Chettiar, and Naziruddin Ahmad wanted to continue the usage of English, while Nehru, although supporting the dropping of English as an official language in favour of Hindi/Hindustani, cautioned against forcefully doing so in face of opposition in the South. The Indian constitution, adopted in 1950, as a compromise envisaged that English would be phased out in favour of Hindi over a fifteen-year period, but gave Parliament the power to, by law, provide for the continued use of English even thereafter.

Plans to make Hindi the sole official language of the Republic were met with resistance in many parts of the country, especially in Tamil Nadu, which had a history of opposing imposition of the Hindi language dating back to 1937, when the Justice Party opposed the then Congress led Madras Government's decision to make Hindi compulsory in secondary/middle schools.

The Indian constitution, in 1950, declared Hindi in Devanagari script to be the official language of the union. Unless Parliament decided otherwise, the use of English for official purposes was to cease 15 years after the constitution came into effect, that is, on 26 January 1965. The prospect of the changeover, however, led to much alarm in the non-Hindi-speaking areas of India, especially Dravidian-speaking states whose languages were not related to Hindi whatsoever. As a result, Parliament enacted the Official Languages Act, 1963, which provided for the continued use of English for official purposes along with Hindi, even after 1965.

In late 1964, an attempt was made to expressly provide for an end to the use of English, but it was met with protests from states and territories, including Maharashtra, Tamil Nadu, Punjab, West Bengal, Karnataka, Puducherry, Nagaland, Mizoram and Andhra Pradesh. Some of these protests also turned violent. As a result, the proposal was dropped, and the Act itself was amended in 1967 to provide that the use of English would not be ended until a resolution to that effect was passed by the legislature of every state that had not adopted Hindi as its official language, and by each house of the Indian Parliament.

The position was thus that the Union government continues to use English in addition to Hindi for its official purposes as a "subsidiary official language", but is also required to prepare and execute a program to progressively increase its use of Hindi.The exact extent to which, and the areas in which, the Union government uses Hindi and English, respectively, is determined by the provisions of the Constitution, the Official Languages Act, 1963, the Official Languages Rules, 1976, and statutory instruments made by the Department of Official Language under these laws.