Ethmia nadia is a moth in the family Depressariidae. It is found in California.
The length of the forewings is 7.7-. The ground color of the forewings is darkgray, but paler distally. There are dark spots adjoining a longitudinal streak. Adults are on wing from March to May (in southern California) and from June to July (in Siskiyou County).[1]
The larvae feed on Phacelia ramosissima.