Braj is a language within the Indo-Aryan language family spoken in the Braj region in Western Uttar Pradesh centered on Mathura. Along with Awadhi, it was one of the two predominant literary languages of North-Central India before gradually merging and contributing to the development of standardized Hindi in the 19th century. It is spoken today in its unique form in many districts of Western Uttar Pradesh, often referred to as 'Central Braj Bhasha'.

The language was historically used for Vaishnavite poetry dedicated to Krishna, whose life was associated with sites in the Braj region. There were also early prose works in terms of the hagiographical vārtā literature of the Vallabha sect.

Braj is considered by scholars to be a more conservative example of the Central Indo-Aryan languages compared to the Hindustani language, which has been influenced by Panjabi and intermediate dialects.

Braj Bhasha is spoken in the nebulous Braj region centred on Mathura, Agra, Aligarh, Hathras, Gautam Buddh Nagar, Bulandshahr in Uttar Pradesh and Bharatpur, Deeg, Karauli, Gangapur & Dholpur in Rajasthan. It is the predominant language in the central stretch of the Ganges-Yamuna Doab in the following districts:

In Rajasthan it is spoken in the districts of :

In Western Uttar Pradesh spoken in the southern part of western Uttar Pradesh. Braj-speaking districts include Mathura, Hathras, Agra, Aligarh, Etah, Firozabad, Budaun, Mainpuri, Etawah, Bareilly, Sambhal and Most parts of Gautam Buddh Nagar (areas of Jewar and Greater Noida), Bulandshahr (areas of Khurja, Shikarpur, Bulandshahr, Aurangabad, Bulandshahr, Anupshahr and Sikandrabad) and Even Some communities still speaks Braj basha near southern part of Ghaziabad.

In Haryana it is spoken in the districts of :

The area of South Delhi, which is connected to Faridabad, still has some communities that speak Brajbhasha.