Locha hyalina is a moth species in the family Geometridae from Central and parts of South America.

It was described by Dru Drury in 1782, but his name Phalaena diaphana was invalid as pre-occupied (see Eloria diaphana).

Upperside: Antennae pectinated (comb like).

Wings diaphanous, the edges being bordered with black, a black band also crosses the anterior, from the anterior edges to the lower corners.

Wings coloured on this side as on the upper.