Stenoptilia mengeli is a moth of the Pterophoridae family. It is found in Greenland and Nunavut, Canada. The wingspan is about 20 mm. The head, palpi, thorax, abdomen and legs are dark ashy grey. A fine white line occurs over each eye. The forewings are ashy grey and glistening. There are a few dark fuscous scales on the first lobe, forming an ill-defined longitudinal stripe on the middle. There is also a fuscous spot at the end of the cleft and a less distinct one on the middle of the cell. The hindwings are ashy grey.