 The study found that the most common HLA antigen types among Iranian kidney transplant patients are A2, A1, A3, A24, and A26 for HLA A, B35, B13, B15, and B18 for HLA B, DR4, DR11, DR1, DR3, and DR15 for HLA DR, and DQ1, DQ3, and DQ2 for HLA DQ. This shows significant heterogeneity in both HLA Class 1 and Class 2 antigens, which reflects recent admixture of this population with neighboring Middle Eastern populations. This article was authored by Beyzadi Nalahi, Zahra Rostami, and Mojtaba Tamuri.