Fivenewly recorded subfamilies, Diacritinae, Microleptinae, Orthocentrinae, Orthopelmatinae, and Phrudinae, were the small and rare subfamilies of the family Ichneumonidae except Orthocentrinae. The first subfamily Orthocentrinae have been reported 31 genera with 481 species worldwide but we have a very poor knowledge of this subfamily in Korea. This subfamily is known for larval koinobiont endoparasitoids of Diptera (Humala, 2008). The second subfamily Diacritinae have been reported six species in the world and distributed four species in the Eastern Palaearctic (Yu et al., 2012). The third subfamily Microleptinae have been recorded only one genus with 13 species in the world. Among them 10 species are distributed in the Eastern Palaearctic. The fourth subfamily Orthopelmatinae have been reported nine species of one genus in the world, five species in the Eastern Palaearctic. The final subfamily Phrudinae have been reported 29 species in the world, five species in the Eastern Palaearctic. The subfamily Eucerotinae have been recorded 50 species in the world and four species from Korea. This subfamily is known for hyperparasitoids of Ichneumonoidea (Wahl & Sharkey, 1993). In this paper we report not only five newly recorded subfamilies new to Korean fauna but also eight newly recorded species included two species of Eucerotinae for the first time from Korea.