Epermenia ergastica is a moth in the family Epermeniidae. It was described by Meyrick in 1917. It is found in Indonesia, where it has been recorded from the Tenimbar Islands. The wingspan is about 10 mm. The forewings are pale grey irrorated with dark fuscous. The discal stigmata is blackish, remote and the second beyond two-third. There is a dark fuscous apical dot, edged anteriorly by a cloudy pale mark preceded by some dark fuscous suffusion. The hindwings are grey, but paler anteriorly.