Stomopteryx orthogonella is a moth of the Gelechiidae family. It was described by Staudinger in 1871. It is found in central and southern European Russia and Ukraine. The wingspan is 12.5–14.5 mm. The forewings are brown with a narrow black streak from the base along the fold to nearly half the length of the wing, with a few orange-brown scales and a diffuse black spot in the middle of the cell. There is also a black dot in the cell corner, as well as creamy spots at three-fourths of the costa and dorsum. The subapical area is mottled with grey scales. The hindwings are grey with a narrow yellow-white line at the border to the grey fringe. Adults have been recorded on wing in May, July and August, possibly in two generations per year.