Three Ethmia species have been found in new materials from Korea: Ethmia comitella Caradja, 1927 (= Ethmia xanthopleura Meyrick, 1931, syn. n.; Ethmia comitella steppella Dubatolov, Ustjuzhanin & Zintschenko, 1997, syn. n.), Ethmia septempunctata (Christoph, 1882), and Ethmia cirrhocnemia (Lederer, 1870) found at the Korea-China border. Taxonomic comments and new distribution data of these three species are given, with illustrations of male and female genitalia.