Acheilognathus kyphus is a species of freshwater ray-finned fish in the genus Acheilognathus, a bitterling. It is found in eastern Asia; inhabiting Thailand and northern Vietnam. However, due to a general lack of knowledge, IUCN has classified the fish as being data deficient. In Czech, Acheilognathus kyphus is known as "Hoà Âavka thajská", meaning Thai bitterling.