Western Rainbowfish
Melanotaenia australis
- Least concern
- Card rarity: Common
- Fish

Melanotaenia australis, the western rainbowfish, is a species of freshwater rainbowfish endemic to Australia's Kimberley and Pilbara, Top End. The western rainbowfish is one of the most common and highly abundant freshwater fish endemic to north-western Australia; It ranges from the Ashburton River in the Pilbara region of Western Australia to the Adelaide river in the Northern Territory. It shows extensive geographic variation in their color pattern.
Classification
- Class
- Actinopterygii
- Order
- Atheriniformes
- Family
- Melanotaeniidae
- Genus
- Melanotaenia