Niangua Darter
Etheostoma nianguae
- Vulnerable
- Card rarity: Rare
- Fish

The Niangua darter is a species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. It is endemic to Missouri, United States. It is found only in the Osage River Basin of central Missouri where its range historically included the Sac River, Pomme de Terre River, Niangua River, Big Tavern Creek, and Maries River. It is a federally listed threatened species of the United States.
Classification
- Class
- Actinopterygii
- Order
- Perciformes
- Family
- Percidae
- Genus
- Etheostoma