Cryptolectica ensiformis is a moth of the family Gracillariidae. It is known from China (Hainan), India, Indonesia (Sulawesi), Japan (Tusima, the Ryukyu Islands, Honshū, Kyūshū, Shikoku) and Thailand.[1]
The wingspan is 9.2–11 mm.
The larvae feed on Quercus acuta and Quercus sessilifolia. They probably mine the leaves of their host plant.