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Acute renal allograft rejection remains an important problem following kidney transplantation. Several immunological and non-immunological factors intervene in renal graft rejection. Glutathione S-transferase super family is one of the important enzymes for biotransformation of both exogenous and endogenous xenobiotic compounds such as immunosuppressive drugs. The new class of this family is omega that includes two subunits GSTO1 and GSTO2. In this study 282 samples were collected from renal recipients of Namazi hospital in Shiraz-Iran during 2007–2010 years. Also 300 healthy samples as control group were collected from Shiraz population, included in our study. The primary outcome of this study was defined as biopsy-proven acute rejection during 1 year of renal transplantation. We applied polymerase chain reaction–restriction fragment length polymorphism method for determination of GSTO2 N142D polymorphism. Our result showed no significant association between GSTO2 polymorphism and acute rejection. Also this genetic variant has no significant effect with the risk of end stage renal disease. Cadaveric donor type for acute rejection significantly differed between acute rejection and non acute rejection patients (P = 0.004). The combination effect of donor type and GSTO2 polymorphism indicates DD genotype with cadaver donor type increase risk of acute rejection (OR = 3.82, 95 % CI 1.80–12.37, P = 0.02).