Korean Symmorphus species are reviewed taxonomically. We have confirmed eleven species including six newly recorded ones from the Korean Peninsula: Symmorphus ambotretus, S. angustatus, S. apiciornatus, S. bifasciatus, S. carinatus, S. decens, S. foveolatus, S. lucens, S. mizuhonis, S. murarius, S. tsushimanus. A key, diagnosis, remark and illustrations to all the known species are provided.