Khair is a town and a municipal board in Aligarh district in the Indian state of Uttar Pradesh.

The town was held by Amar Singh Jat during the 17th century.

Amar Singh revolted against the Mughal Empire and declared his independent.

He also built the fortress of Rait and became the leader of the rebels of Tappal, Khurja, Koel, Chandausi and Atrauli parganas.

[4][5][6][7] As of 2011 Indian Census, Khair had a total population of 35,751, of which 19,019 were males and 16,732 were females.