Helcystogramma triannulella is a moth in the Gelechiidae family. It was described by Herrich-Schäffer in 1854. It is found in south-western and south-eastern Siberia, the Caucasus, Transcaucasia, Kazakhstan, Korea, Japan, China, northern India and large pars of Europe, except Ireland, Great Britain, the Netherlands, Denmark, Scandinavia, the Baltic region and the western Balkan Peninsula. The wingspan is 12-15 mm. There are several generations between May and October in southern Europe.