Stomopteryx oncodes is a moth of the Gelechiidae family. It was described by Meyrick in 1913. It is found in South Africa. The wingspan is 18–19 mm. The forewings are dark purplish-slaty-fuscous. The stigmata are black, with an additional elongate black dot on the fold before the plical, and with the plical obliquely before the first discal, the first discal elongate. There are a few black scales around the apical part of the costa and termen. The hindwings are dark grey.