The Swannanoa darter (Etheostoma swannanoa) is a species of ray-finned fish in the perch family. It is endemic to the eastern United States where it occurs in the drainage of the Tennessee River. It prefers flowing water in riffles in cool, clear mountain streams, with boulder substrates. The diet and natural history of this species have been little studied but are probably similar to those of its close relative, the greenside darter (Etheostoma blenniodies). The population trend of this fish seems to be stable and it is a common species with numerous sub-populations over its limited range, and the International Union for Conservation of Nature has assessed its conservation status as being of "least concern".