Stegasta jejuensis is a moth of the Gelechiidae family. It was described by Park and Omelko in 1994. It is found in the Russian Far East, Korea and Japan. The wingspan is 9–10 mm. The forewings are dark fuscous, with three white or yellowish-white spots at one-fourth, halfway and three-fourths on the costal margin. The first widely extended to the well-developed yellowish-white basal fascia expanding to a whitish-orange fascia, which runs along the dorsum to near the tornus, the upper corner of this may reach two small yellowish-white spots near the end of the cell. The second smallest, yellowish-white, often accompanied by few white scales posteriorly and the third large, quadrate, more distinctly white than others. There is a black small spot developed near two-thirds of the cell, surrou