Maraimalai Nagar is a municipality town in South Chennai at Chengalpattu district, Tamil Nadu, India.

Maraimalai Nagar is a well developed municipality, and has a great network of roads and drainage.

Maraimalai Nagar Satellite Town was developed by CMDA and it is located in the south direction at a distance of 45 km from Chennai City Centre.

Maraimalai Nagar has the location advantage in terms of transportation net work.

Maraimalai Nagar has a railway station, bus stand, upgraded primary health care, telephone exchange, electricity office, post office, police station and higher secondary schools.

It is becoming the largest residential area between Chennai Tambaram and Chengalpet/Kanchipuram because of the IT and automobile companies in and around Maraimalai Nagar like Accenture, Ford, Mahindra World City and SEZ.

According to 2011 census, Maraimalai Nagar had a population of 81,872 with a sex-ratio of 953 females for every 1,000 males, much above the national average of 929.