Four names by T. Nakai are validly established within Korean Rubus L. (Rosaceae). The invalid name “R. coreanus Miq. var. concolor Nakai” is newly described as R. coreanus var. concolor Nakai ex J. Y. Yang from Gyeongsangnam-do Province in southeastern Korea. The invalid name “R. phoenicolasius Maxim. var. albiflorus Nakai” is newly described as R. phoenicolasius var. albiflorus Nakai ex J. Y. Yang from Jellanam-do Province in southwestern Korea. The invalid name “R. tozawai Nakai” is corrected for its epithet and newly described as R. tozawae Nakai ex J. Y. Yang from southeastern Korea. The new variety R. tozawae var. longisepalus J. Y. Yang is described from Gyeongsangnam-do Province in southeastern Korea. Lectotypes are designated for R. coreanus, R. coreanus var. nakaianus H. Lév., and R. quelpaertensis H. Lév.