Chengalpattu District is one of the 38 districts of Tamil Nadu, in India. The district headquarters is located at Chengalpattu. Chengalpattu district came into existence on 29 November 2019 when it was carved out of Kanchipuram district after the announcement about the bifurcation of districts on 18 July 2019.

Chengalpattu, previously known as Chingleput, is a town and the headquarters of Chengalpattu district of the state Tamil Nadu, India. The town is located near to the industrial and IT hub. It is the headquarters of the district and is 56 kilometres (35 mi) away from the state capital, Chennai on the National Highway 45.