This publication is a check list of Microlepidoptera in Korea which all the available synonyms for each species are arranged. In this book, a total of 628 species belonging to 38 families of microlepidoptera, which are usually characterized by the smallness, are listed. Among them, 234 species are reported for the first time from Korea, and 14 faimilies are new in this country. The previously unknown families are : Nepticulidae, opostegidae, Incurvariidae, Bucculatrigidae, Acrolepiidae, Epermeniidae, Argyresthiidae, roeslerstammiidae, Choreutidae, Ethmiidae, Stathmopodidae, Elachistidae, Blastobasidae and Lecithoceridae. And some host plants which previously known and surveyed newly are also listed.