Maraimalai Nagar is a municipality town in South Chennai at Chengalpattu district, Tamil Nadu, India. Lying in the southern part of the Chennai metropolitan area, it is a satellite town of Chennai, the state capital, around 50 km from Downtown Chennai and about 15 km from Vandalur. It was developed by the CMDA in 1980. Many heavy industries are located in Maraimalai Nagar.