Thecla betulina is a butterfly of the Lycaenidae family. It was described by Staudinger in 1887. It is found in the Russian Far East (Ussuri, Amur), north-eastern China and Korea. The species is found in the foest belt where it inhabits forest edges and river valleys. Adults often visit flowering Umbelliferae species. The larvae feed on Malus species (including Malus mandschurica) and possibly Pyrus species. They roll a leaf of their host plant, forming a tube. Full-grown larvae are green. Pupation takes place in the soil near the host plant.