Dichomeris opsonoma is a moth in the Gelechiidae family. It was described by Meyrick in 1914. It is found in Guyana. The wingspan is about 14 mm. The forewings are pale ochreous-yellow, whitish-tinged towards the costa anteriorly and with a narrow brownish streak along the dorsum from the base to the tornus, becoming dark brown towards the base. The stigmata is minute, rather dark fuscous, the plical beneath first discal. The posterior part of the costa and termen is somewhat suffused with yellow-ochreous and there is a marginal series of minute black specks around the apex and termen. The hindwings are ochreous-whitish.