Two species of the subgenus Exosyntretus (Hymenoptera: Braconidae: Euphorinae) in the genus Syntretus are reported from Korea in this study. The species of the genus Syntretus are small parasitic wasps, which attack adult Hymenoptera. Their hosts are adult parasitoid wasps and adult bees. The subgenus Exosyntretus are known as only five species in the world. Among them, Syntretus (Exosyntretus) nevelskoii Belokobylskij is new to Korea. The world checklist, diagnosis and distribution data are included.

• An, Tae-Ho(The Science Museum of Natural Enemies)
• Su-bin Choi(Department of Biology, Kunsan National University)
• Hyojoong Kim(Department of Biology, Kunsan National University)
• Ki-Gyoung Kim(National Institute of Biological Resources)
• Hong-Yul Seo(National Institute of Biological Resources)
• Deok-Seo Ku(The Science Museum of Natural Enemies)