The Indian Vagabond Butterflyfish, Chaetodon decussatus, is a species of butterflyfish (family Chaetodontidae). It is found in the Indo-West Pacific, from the Maldives via India, Sri Lanka and the Andaman Sea to the westernmost portion of the Indonesian archipelago. Growing to a maximum of 20 cm (nearly 8 in) long, it is found on rich coral reefs and also on rubble and rocky areas. The monogamous adults swim in pairs and may be territorial and aggressive to other Chaetodon; juveniles are solitary. The Indian Vagabond Butterflyfish feeds largely on algae and coral polyps. They are oviparous.