Stenoma iopercna is a moth in the Depressariidae family. It was described by Meyrick in 1932. It is found in Peru. The wingspan is about 13 mm. The forewings are violet-grey, the plical and second discal stigmata small, indistinct and dark grey. There are narrow semi-oval blackish costal spots at the middle and three-fourths, from the second a faint slightly excurved darker shade runs to the tornus. There are indistinct dark grey marginal dots around the apex and termen. The hindwings are blackish-grey.