A taxonomic study of two scaphidiine genera Cyparium Erichson and Scaphidium Olivier in Korea is presented. Members of Cyparium and Scaphidium are known to be obligate inhabitants on mushrooms Four species are recognized. The genus Cyparium Erichson and two species [Cyparium mikordo Achard, Scaphidium optabile (Lewis)] are reported for the first time in Korea. The illustrations, descriptions, and key to the known species in Korea are presented.