| Holiday Name: | Hindi Diwas |
| Official Name: | Hindi Diwas |
| Date: | 14 September |
| Scheduling: | same day each year |
| Duration: | 1 day |
| Frequency: | Annual |
| Observances: | Commemoration of luminaries in the field of Hindi literature |
| Relatedto: | World Hindi Day (10 January) |
Hindi Day (Hindi: हिन्दी दिवस|translit=hindī divas) is celebrated in India to commemorate the date 14 September 1949 on which a compromise was reached—during the drafting of the Constitution of India—on the languages that were to have official status in the Republic of India. The compromise, usually called the Munshi-Ayyangar formula, after drafting committee members K. M. Munshi and N. Gopalaswami Ayyangar, was voted by the Constituent Assembly of India after three years of debate between two opposing camps. The Hindi protagonists wanted Modern Standard Hindi register of the Hindustani language in Devanagari script to be the sole "national language" of India (replacing the British era Hindustani of Perso-Arabic script); the delegates from South India preferred English to have a place in the Constitution. The Munshi-Ayyangar formula declared (i) Hindi to be the "official language" of India's federal government; (ii) English to be an associate official language for 15 years during which Hindi's formal lexicon would be developed; and (iii) the international form of the Hindu–Arabic numerals to be the official numerals. The compromise resolution became articles 343 - 351 of India's constitution, which went into effect on 26 January 1950. In 1965, when the 15 years were up, the Government of India announced that English would continue to be the "de facto formal language of India."
Apart from local-level events in schools and other institutions, a few of the notable events include
Ministry of Home Affairs in its order dated 25 March 2015 has changed name of two awards given annually on Hindi Divas. 'Indira Gandhi Rajbhasha Puraskar' instituted in 1986 changed to 'Rajbhasha Kirti Puraskar' and 'Rajiv Gandhi Rashtriya Gyan-Vigyan Maulik Pustak Lekhan Puraskar' changed to "Rajbhasha Gaurav Puraskar".[3]