The Oriental and eastern Palaearctic planthopper genusOrthopagusUhler, 1897 (Hemiptera, Fulgoromorpha, Dictyopharidae, Dictyopharinae, Orthopagini) is revised. Six species are included:O.bartlettiSong, Malenovský & Deckert,sp. n.(described from India),O.exoletus(Melichar, 1903),comb. n.,stat. rev.(material studied from India and Sri Lanka),O.hainanensisSong, Chen & Liang,sp. n.(described from China: Hainan island),O.lunuliferUhler, 1897 (the type species of the genus; confirmed from Japan, China, Vietnam, Laos, India, and Nepal),O.philippinusMelichar, 1914 (Philippines), andO.splendens(Germar, 1830) (confirmed from China, Vietnam, Thailand, India, Malaysia, and Indonesia).OrthopagusheliosMelichar, 1912 is newly synonymized withO.lunulifer. Lectotypes are designated forO.helios, O.heliosvar.diffusus Melichar, 1912,O.elegansMelichar, 1912, andO.philippinus.DictyopharaindianaWalker, 1851 is considered a nomen dubium. All species are redescribed, including habitus photographs and detailed illustrations of the male genitalia. Female genitalia are described for the genus for the first time. A key for identification of the species ofOrthopagusand a distribution map are given.