Tagiades tethys is a species of butterfly of the family Hesperiidae. It is found in eastern Asia, including the Amur region, southern Ussuri, Japan, Taiwan and Korea. The wingspan is about . The larvae feed on various plants, including Quercus mongolica, Dioscorea nipponica, Dioscorea butatas, Dioscorea japonica and Dioscorea japonica var. pseudojaponica.
Subspecies Tagiades tethys tethys Tagiades tethys birmana (Yunnan) Tagiades tethys daiseni (Japan) Tagiades tethys roona Tagiades tethys moori Tagiades tethys niitakana
External links Japanese Hesperiidae