The genus Patania Moore, 1888 (Lepidoptera, Crambidae) has been recorded in Korea with nine species: P. balteata (Fabricius, 1798), P. brevipennis (Inoue, 1982), P. chlorophanta (Butler, 1878), P. deficiens (Moore, 1887), P. expictalis (Christoph, 1881), P. punctimarginalis (Hampson, 1896), P. ruralis (Scopoli, 1763), P. sabinusalis (Walker, 1859) and P. harutai (Inoue, 1955). In this study, we describe a new species P. gorosoe Lee, Heo & Bae, sp. nov. which very similar with P. harutai. The host plants of above two species are clarificated. Illustrations of adults and genitalia of P. harutai and P. gorosoe sp. nov. are provided. A checklist of the genus Patania in Korea is also provided. [Zoobank registrations: Patania gorosoe Lee, Heo & Bae, new species: LSID: urn:lsid:zoobank.org:act:3FFD8DA8-8EA1-423A-84A9-BC5804E18EA0].