Arignar Anna Zoological Park, Zoo in Chennai, India

Arignar Anna Zoological Park is a zoo in Vandalur, in the southwestern part of Chennai, India, covering 602 hectares and ranking among the largest zoos in South Asia. Its animals are grouped by taxonomic classification in open enclosures with concrete walls and moats, and the grounds also hold a nocturnal animal display, a serpentarium, an aquarium, an amphibian house, a butterfly park, a primate house and a walk-through aviary.

The facility began as the Madras Zoo at Pantheon Complex in 1855 and moved to the current Vandalur site in 1985 under Chief Minister M. G. Ramachandran. The relocation allowed for a large increase in land area and provided more space for animal housing and conservation programs.

The park is named after C. N. Annadurai, the former Tamil Nadu chief minister known as Arignar, or "the scholar". In 1955 the zoo hosted the first All India Zoo Superintendents' Conference as part of its centenary. A forest museum near the entrance displays information on insects, plants and minerals.

Visitors can buy tickets online and use a mobile app to find information on exhibits and animal locations. The paths are built for walking, but comfortable shoes are recommended because of the size of the grounds.

The zoo's rescue and rehabilitation centre covers 92 hectares next to the main grounds, taking in abandoned and confiscated animals. The zoo also runs its own veterinary hospital, where staff screen for disease, treat and vaccinate animals. The park opened a forest museum near the entrance with displays on insects, plants and minerals.