Stenoma biannulata is a moth in the Depressariidae family. It was described by Meyrick in 1930. It is found in Brazil (Para). The wingspan is about 16 mm. The forewings are light violet-grey, the extreme costal edge white and with a whitish dot near the base in the middle. The first discal stigma is grey, hardly defined, the plical dark grey, obliquely beyond it, the second discal dark grey, transverse, widest above, with slight whitish suffusion on both sides, an erect grey shade from the dorsum just beyond and not reaching this. A curved grey shade is found from the costa before three-fourths to the tornus, hardly sinuate towards the costa and there is a marginal series of blackish marks around the apical part of the costa and termen. The hindwings are grey.