The author investigated frequencies of phenotype and genotype in 200 Rh negative Koreans during 7 years from January, 1975 to September, 1981, with brief review of Japanese and Europian literatures. In 200 Rh negative Koreans, the distribution of Rh phenotypes and most likely genotypes are as follows: ccdee (cde/cde) 60%, Ccdee (Cde/cde) 23.5%, ccdEe (cdE/cde) 10%, CcdEe (Cde/cdE or CdE/cde) 40%, CCdee (Cde/Cde) 2.0% and ccdEE (cdE/cdE) 0.5%