Vandalur is a census town and taluk headquarters in the Chengalpattu district lying south of the metropolitan city of Chennai, India. Vandalur serves as the southern gateway to Chennai city. It has the Arignar Anna Zoological Park, which contain some rare species of wild flora and fauna. The town is served by Vandalur railway station of the Chennai Suburban Railway network.

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.