The ABO blood group system is highly polymorphic, with more than 20 distinct sub-groups; study findings are usually related to ABO phenotype, but rarely to the ABO genotype and animal models are unsatisfactory because their antigen glycosylation structure is different from humans. Both the ABO and Rh blood group systems have been associated with a number of diseases, but this is more likely related to the presence or absence of these tissue antigens throughout the body and not directly or primarily related to their presence on RBCs. A total of fifty-two 52 patients without complication of DMII, two hundred sixteen 216 patients with complication of DMII and seventy-one 71 person as healthy control were included in the study. The results of the study showed a significant difference in distribution of ABO blood groups between (healthy and DM II subjects) and between (DM II with complication and DM II without complication group), the comparison in the distribution of ABO blood groups among diabetic nephropathy, diabetic retinopathy and diabetic neuropathy groups shows non- significant difference.