Blood grouping plays an important vital role in blood and its component transfusions. Blood groups are further grouped as major and minor blood groups. The ABO and Rhesus (Rh) blood groups belongs to major blood group system. These groups vary from individual to individual and also in different parts of the country. The aim of this study is to know the distribution and pattern of different blood groups prevalence in and around Tumkur. The blood groups were done in the blood bank unit. 4114 individuals are screened for ABO and Rhesus (Rh) blood groups. Among the ABO system the commonest blood group is group O, followed by group B, and group  A. The least common group is AB. The same individuals are subjected for Rh grouping. The distribution of Rh-positive and Rh-negative group are 94.87% and 5.13% respectively. 

Keywords: ABO Blood Group; Rh Group.