The paper contains a taxonomic review of 12 species of the genus Myrmica occurring in Korea. The following species are under discussion: M. angulinodis Ruzsky, M. carinata Kupyanskaya, M. hyungokae Elmes, M. jessensis Forel, M. kasczenkoi Ruzsky, M. kotokui Forel, M. koreana Elmes, M. kurokii Forel, M. lobicornis Nylander, M. ruginodis Nylander, M. silvestrii Wheeler, M. sulcinodis Nylander. Twelve species of the genus Myrmica are recognized from Korea, these are revised and a key to their identification is provided. Five species, M. cadusa, M. incurvata, M. saphoshikovi, M. scabrinodis, and M. yoshiokai are questionable to be distributed in Korea, as I have not found any specimens preserved in Korea. The SEM photo and illustrations of the worker of each species are provided.