Acleris semipurpurana is a species in the moth family Tortricidae, and one of several species of moth commonly known as oak leaftier or oak leaf tier. The larvae feed on the leaves of oak trees in the Eastern United States and southeastern Canada. It can be a major cause of defoliation in oak trees. The loss of leaves can kill or damage the affected trees, which are chiefly in the Lobatae or red oak section of Quercus or oaks.