Lethata monopa is a moth of the family Depressariidae.

The forewings are brown with the costa and termen faintly ochreous.

From the anal angle, an area of fuscous shading extends upward and outward to near the costa and there is a spot at the end of the cell, consisting of a ring of light brown enclosing a spot of slightly darker brown.

There is a transverse, outwardly curved faint fuscous line at the apical fourth, extending from the costa to the dorsum.

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