Elachista inopina is a moth of the family Elachistidae that is found in California.[1]
The length of the forewings is 6.3-. The forewings are broad. The basal 1/4 of the costa is brownish grey. The ground colour is white, with some scattered brown-tipped scales especially in the distal part of the wing, and forming an indistinct spot in the middle at the fold and another similar spot at 3/4 of the wing. The hindwings are grey and the underside of the wings is also grey.
The species name is derived from Latin inopinus (meaning unexpected).