Leucospidae Walker are a relatively small family in Chalcidoidea, and they consist of four genera and about 140 species in worldwide. In neighboring countries, 12 species are known from China and four species are known from Japan, but only one species is known from South Korea by Paik (1974). In this study, Leucospis yasumatsui Habu is reported for the frist time from South Korea. A key to South Korean species of the genus Leucospis Fabricius, diagnosis, photos of characteristics and distribution from South Korea are provided.