A genus Omosita Erichson, 1843 which belongs to the sap beetle, Nitidulidae, is reviewed from Korea. Two species Omosita colon (Linnaeus, 1758) and O. japonica Reitter, 1874 are previously known from Korea, one species O. discoidea (Fabricius, 1775) is first recorded from Korea. A key to species, re-descriptions, biology, illustrations of both male and female of the genus Omosita are provided.

• Seunghyun Lee(Insect Biosystematics Laboratory, Seoul National University, Department of Agricultural Biotechnology, Seoul National University)
• Alexander Kirejtshuk(Zoological Institute of the Russian Academy of Sciences, Universitetskaya emb. 1, St. Petersburg 199034, Russia)
• SeunghwanLee(Insect Biosystematics Laboratory, Seoul National University, Department of Agricultural Biotechnology, Seoul National University)