Two new species of the genus Doridicola Leydig, 1853, which are parasitic on decapodiform cephalopods, are described from the Yellow Sea coast of Korea. Doridicola minus n. sp. is a parasite of the beka squid, Loliolus beka (Sasaki, 1929). As its diagnostic taxonomic features, the female caudal ramus is approximately 3.3 times as long as it is wide, the exopodal segment of male leg 5 is small, approximately 0.2 times as long as the genital somite, and the male antennule bears two additional aesthetascs on the second segment. Doridicola rarus n. sp., found on a cuttlefish (genus Sepia), closely resembles D. longicauda (Claus, 1860) but can be distinguished from the latter European species by the elongated distal endopodal segment of female leg 4 and by the distinct form of the genital double-somite, which is markedly longer than it is wide. Doridicola sepiae (Izawa, 1976) is redescribed based on newly collected Korean material. It can be differentiated from its relatives by the elongated caudal rami which are about 3.8 times longer than they are wide in the female, by the elongate distal endopodal segment of female leg 4, which is approximately 2.8 times as long as wide, by the elongated exopodal segment of male leg 5, which is approximately half the length of the genital somite, and by the presence of two additional aesthetascs on the male antennule, one on the second segment and the other on the fourth.