Braj Bhasha (Devanagari: ब्रज भाषा), also called Brij Bhasha (बॄज भाषा), Braj Bhakha (ब्रज भाखा), or Dehaati Zabaan (देहाती ज़बान, 'country tongue'), is a Central Indian language closely related to Hindi. In fact it is usually considered to be a dialect of Hindi, and along with Awadhi was one of the two predominant literary languages of North-Central India before the switch to Khariboli in the 19th century.

Braj Bhasha is spoken by people in the nebulously defined region of Vraja Bhoomi, which was a political state in the era of the Mahabharata wars. According to ancient Hindu texts such as the Bhagavata Purana, the kingdom of King Kamsa is described as spreading through the Braj (also known as Vrija or Vraja), where the incarnation of Krishna was born and spent his childhood days. This region lies in the Agra-Mathura area, and stretches as far as the environs of Delhi. In modern India, this area lies mostly in northwestern Uttar Pradesh, the eastern extremities of Rajasthan i.e. Dholpur & Bharatpur and the southern extremities of Haryana. Today Braj Bhoomi can be seen as a cultural-geographical entity rather than a proper state. It is the vernacular of the region and boasts a rich culture and literature by famous poets like Surdas, Bhai Gurdas and Amir Khusro. Brij Bhasha is very close to Avadhi, spoken in neighbouring Avadh region.