Nanmangalam Reserve Forest is a protected forest located in Chengalpattu district, about 24 km from the city centre.

The reserve forest has an area of 320 hectares.

Red-wattled lapwing, Hoopoe, crested honey buzzard, grey partridge, coucal, Indian eagle-owl, white-breasted kingfisher, pied kingfisher, southern bush lark and red-whiskered bulbul are commonly seen in the area.

[2] The 320-hectare Nanmangalam Reserved Forest, located about 10 km from Velachery, is a scrubland around an abandoned granite quarry[3] and is home to some of the rare territorial orchids, according to a recent study.

[4] The neighbourhood of Nanmangalam is one of the 163 notified areas (megalithic sites) in the state of Tamil Nadu.