Elachista eleochariella is a moth of the family Elachistidae found in Europe and North America.

Forewings are grey; plical stigma black, preceded and followed by whitish marks; a small tornal spot, and an oblique wedge-shaped mark on costa opposite whitish.

[1][2] [3] The larvae feed on glaucous sedge (Carex flacca), carnation sedge (Carex panicea), black sedge (Carex nigra), common spike-rush (Eleocharis palustris) and common cottongrass (Eriophorum angustifolium).

[4] There is some confusion as to the form of the mine with a different description on the UKmoths website.

[6] In Europe it is found from northern Europe and northern Russia to the Pyrenees and Alps, and from Ireland to Romania.