Recently in the course of examining Korean diptera, we found a species, Atrichopogon femoralis Tokunaga placed in the subfamily Forcipomyinae Meigen. Forcipomyinae is most specious in the family Ceratogonidae, and comprise about 5,566 extant species placed in 103 genera in four subfamilies (Borkent and Wirth, 1997) from almost all the zoogeographic regions. Genus Atrichopogon is second largest genus, with about 520 species (Borkent, 2012). Currently 39 valid species of 6 genera belonging to 3 subfamily are known in Korea. The specimens were collected from intermountain area and reservoir of Chungcheongnam-do, Cheonan-si, and Gyeongsangbuk-do, Gyeongju-si by black light trap (BLT) in 2013. We report an occurrence Atrichopogon femoralis Tokunaga for the first time in Korea, and of which diagnosis, description, distribution and photo images are presented. For further researches, we also provide a key to genera of Korean Ceratopogonidae.