The subgenus Scymnus of Scymnus Kugelann, 1794 from China is revised. Fifty-six species of the subgenus Scymnus known to occur in China, including twenty seven new species are documented: Scymnus (Scymnus) impolitus sp. nov., S. (S.) obesus sp. nov., S. (S.) zhangmuensis sp. nov., S. (S.) byssinus sp. nov., S. (S.) makuensis sp. nov., S. (S.) extumidus sp. nov., S. (S.) comosus sp. nov., S. (S.) choui sp. nov., S. (S.) trachypus sp. nov., S. (S.) deltatus sp. nov., S. (S.) leigongicus sp. nov., S. (S.) arciformis sp. nov., S. (S.) luxiensis sp. nov., S. (S.) acerbus sp. nov., S. (S.) pingqianensis sp. nov., S. (S.) deflexus sp. nov., S. (S.) plautus sp. nov., S. (S.) xiongfeii sp. nov., S. (S.) recavus sp. nov., S. (S.) nabangicus sp. nov., S. (S.) fasciculatus sp. nov., S. (S.) fusinus sp. nov., S. (S.) guniujiangicus sp. nov., S. (S.) caiyanghensis sp. nov., S. (S.) serratus sp. nov., S. (S.) biconvexus sp. nov., and S. (S.) clavellatus sp. nov. Scymnus (Scymnus) sufflavus Canepari, 1997 and S. (S.) trisulicus Canepari, 1997 are recorded from China for the first time. Nomenclatural history, diagnoses, illustrations and distribution are provided for fifty-five recognized species. A key to the species from China is presented.