We reviewed the Korean species belonging to the genus Hemicrepidius. Of the previously recorded five species, the specimens known as H. (s. str.) secessus secessus (Candèze, 1873) are confirmed as the misidentification of H. oblongus (Solsky, 1870). The status of H. (s. str.) secessus hallaensis Kishii 2002 is suggested to be raised to species level. We also propose three new species, H. (s. str.) sp1 nov., H. (s. str.) sp2 nov., H. (Miwacrepidius) sp1 nov. from Korea.
In Hemicrepidius sensu strito, molecular approaches based on the species recognized from Korea, Russia, and Japan using COI and 16S rRNA genes strongly support that all Korean species and the Russian specimens of H. oblongus are clustered into a monophyletic group, whereas Japanese species might be early and independently divided from the former.

• Taeman Han(Applied Entomology Division, Department of Agricultural Biology, National Academy of Agricultural Science)
• Hae Chul Park(Applied Entomology Division, Department of Agricultural Biology, National Academy of Agricultural Science)
• Young Bo Lee(Applied Entomology Division, Department of Agricultural Biology, National Academy of Agricultural Science)
• Sangwook Park(Division of Entomology, School of Agricultural Biotechnology, Seoul National University)
• Seunghwan Lee(Division of Entomology, School of Agricultural Biotechnology, Seoul National University)