Earlier, Ceraphronoids group has been belong to the superfamily Proctotrupoidea sensu lato, as polyphyletic group. But, Masner and Dessart (1967) proposed this group as a separate superfamily, Ceraphronoidea to include Ceraphronidae and Megaspilidae. At present Ceraphronoidea comprised of two families with 27 genera and 603 species described worldwide (except fossil family Stigmaphronidae), though a great many species are still undescribed. This group is morphologically distinguished from other Hymenoptera superfamilies by the following combination of characteristics: two protibial spurs present; forewing C+Sc fused, Rs vein upcurved; metasomal segment II large; metasomal spiracles absent. Ceraphronoids are small group of Parasitic Apocrita of Hymenoptera. They majority are endoparasitoids of a wide range of insects under Diptera, Homoptera (superfamily Coccoidea), Hymenoptera, Lepidoptera, Neuroptera and Thysanoptera. However, Coleoptera, Diptera, Lepidoptera, Hymenopera, Neuroptera, Orthoptera, Heteroptera, spider eggs, and ticks are also attacked. And some species are hyperparasitoids of aphidiinae braconids. Ceraphronoidea has been studied in South Korea mainly by Paik (1994). He recognized the presence of only four species in Megaspilidae as follows: Dendrocerus carpenteri (Curtis, 1826), D. longispinus (Yasumatus & Moritsu, 1947), D. pupparum (De geer, 1776) and D. remicornis (Boheman, 1832). As a result of this study, 2 families and 2 genera of Ceraphronoidea, Ceraphron in Ceraphronidae, Conostigmus in Megaspilidae are recognized in South Korea. Also, above one family Ceraphronidae and all genera are newly recorded for the first time. We provide comparison of important diagnostic characters with two families and color photographs.