Ringtail Cardinalfish
Ostorhinchus aureus
- Least concern
- Card rarity: Common
- Fish

The ring-tailed cardinalfish is a widespread fish species in the family Apogonidae found in the Red Sea and off East Africa to Papua New Guinea, north to Japan, and south to Australia.
Classification
- Class
- Actinopterygii
- Order
- Gobiiformes
- Family
- Apogonidae
- Genus
- Ostorhinchus