Hindi Diwas or Hindi Day is observed every year on 14 September to mark the popularity of Hindi as an official language of India.

September 14, 1949, was the day when the Constituent Assembly of India accepted Hindi, written in Devnagari script, as one of the official languages in India. The first Hindi Diwas ever celebrated dates back to September 14, 1953, when the day was officially recognized.

The first time World Hindi Day was celebrated was in 2006 and On 26 January 1950, Hindi was recognized as an official language in Article 343 of the Constitution.

Hindi is spoken in Nepal, New Zealand, UAE, Uganda, Fiji, Mauritius, Suriname, Guyana, Trinidad, Bangladesh, Pakistan, USA, UK, Germany, and Tobago.

The first Prime Minister of the country, Jawaharlal Nehru, decided to celebrate Hindi Diwas on September 14.

World Hindi Day was first celebrated in 2006 by former Prime Minister Dr. Manmohan Singh with an aim to promote the Hindi language across the world.

In 1881, Bihar replaced Hindi as its official state language and became the first Indian state to adopt the language officially

Several Hindi words like 'Achha', and 'Surya Namaskar' have been included in the Oxford Dictionary