One hundred voluntary blood donors in Hanoi were typed for antigens in the MNS, Rh,Kell, Duffy, and Kidd blood group systems. They were also tested for the presence of the Mi.III (GP.Mur) phenotype and Lewis system antigens. The Jk phenotype frequencies were markedly different from those previously reported. The frequency of the Mi.III phenotype was similar to that reported in Chinese and Taiwanese.