Semioscopis avellanella is a species of moth of the Depressariidae family. It is found in most of Europe (except most of the Balkan Peninsula, the Iberian Peninsula and Ireland) east to the eastern parts of the Palearctic ecozone. The wingspan is 20–26 mm. Adults are on wing from March to April. The larvae feed on Betula, Tilia (including Tilia cordata) and Carpinus species. They feed inside a folded or rolled leaf of their host plant. Pupation takes place in detritus. The species overwinters in the pupal stage.