Tosca elachistella is a moth of the family Gelechiidae.

It is found in North America, where it has been recorded from Texas.

The forewings are light silvery ochreous, somewhat darker along the costal edge and toward the apex.

There are six small dots of blackish raised scales in two longitudinal rows, the upper through the middle of the wing, the lower on the fold.

This article on a moth of the subfamily Anomologinae is a stub.