Eucosmophora sideroxylonella is a moth of the family Gracillariidae.

[1] The length of the forewings is 3.4 mm for males and 3.8 mm for females.

[2] The larvae feed on Lyonia fruticosa, Dipholis salicifolia, Manilkara jaimiqui, Sideroxylon foetidissimum, Sideroxylon celastrinum and Sideroxylon pallidum.

They mine the leaves of their host plant.

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