Eleven species of the genus Diaparsis, including two unidentified species, are recorded from South Korea. One new species, D. koreana Khalaim, et al., sp. nov., is described, and six species, D. carinifer (Thomson), D. convexa Khalaim, D. egregia Khalaim, D. hyperae Kusigemati, D. jucunda (Holmgren) and D. neoplicator Khalaim, are recorded from this country for the first time. Diaparsis hyperae and D. pulchra are the most abundant species of the genus in the Korean fauna. A key to eleven species of Diaparsis occurring in South Korea is provided.