Eastern Triangle Butterflyfish
Chaetodon baronessa
- Least concern
- Card rarity: Common
- Fish

The eastern triangle butterflyfish, also known as the baroness butterflyfish, is a species of marine ray-finned fish, a butterflyfish belonging to the family Chaetodontidae. It is found in the central Indo-West Pacific region from the Cocos-Keeling Islands and Indonesia in the eastern Indian Ocean to Fiji and Tonga, north to southern Japan, south to New Caledonia and New South Wales in Australia.
Classification
- Class
- Actinopterygii
- Order
- Acanthuriformes
- Family
- Chaetodontidae
- Genus
- Chaetodon