The Madras Crocodile Bank Trust (MCBT) is a reptile zoo and herpetology research station, located 40 km south of the city of Chennai, in state of Tamil Nadu, India. It was established with the aim of saving three Indian endangered species of crocodile - the marsh or mugger crocodile, the saltwater crocodile, and the gharial, which at the time were all nearing extinction. The center covers 8.5 beautifully landscaped acres and had over 450,000 visitors in 2007.

The captive breeding program at the Croc Bank has been highly successful, with thousands of crocodiles reintroduced to the wild and more still sent to zoos and wildlife parks around the world. All three remain endangered, while the Gharial is critically endangered and now faces extinction. MCBT is currently home to over 2400 crocodiles, and also houses many species of turtles, snakes, and lizards which are viewable by the public.