Deoptilia heptadeta is a species of moth in the family Gracillariidae.

It is known from Japan (the Ryukyu Islands, Kyūshū, Shikoku, Honshū, Tusima, the Amami Islands) and Taiwan.

The larvae feed on Mallotus japonicus.

They mine the leaves of their host plant.

This article relating to moths in subfamily Acrocercopinae is a stub.