The Three-striped butterflyfish (Chaetodon tricinctus) is a species of marine ray-finned fish, a butterflyfish belonging to the family Chaetodontidae. It is native to eastern Australia, Lord Howe Island and Norfolk Island in the Tasman Sea. It is found a depths of 3mto15mm (10feetto49feetm) on coral-rich lagoons and outer reefs. This species reaches a maximum length of 15cm (06inches) TL.