Elachista unifasciella

Elachista unifasciella is a moth of the Elachistidae family. It is found from Sweden to the Pyrenees, Italy and Greece and from Great Britain to Russia and Turkey.

The wingspan is 9–10 millimetres (0.35–0.39 in). Adults are on wing from June to July in one generation per year.

The larvae feed on Avenula pubescens, Brachypodium sylvaticum, Dactylis glomerata, Holcus mollis and Milium effusum. They mine the leaves of their host plant. First, they create a long, somewhat blistered, slightly transparent corridor. Later, they mine the basal leaves lying on the ground. They are light yellow with a light brown head. Larvae can be found from autumn to the end of May.