Erechthias mystacinella, the curve-winged apple moth, is a moth of the Tineidae family. It is found in the Australian Capital Territory, Tasmania and Victoria. The wingspan is about 14 mm. The larvae have been found feeding and living inside galls and damaged stems caused by Uromycladium tepperianum, Cecidomyia acaciaelongifoliae and Schizoneura lanigera and on various plants and trees, including Malus domestica, Acacia dealbata and Acacia melanoxylon.