Stenoma horocyma is a moth of the Depressariidae family. It is found in Brazil (Amazonas). The wingspan is about 10 mm. The forewings are glossy dark indigo-blue-grey with the costal edge white. There are white marks on the costa before and beyond the middle. The second discal stigma is white and there is a waved white line just within the margin around the posterior part of the costa and termen. The hindwings are grey.