Excess production of reactive oxygen species and the loss of antioxidant efficiency systems play an important role in the development of diabetes. Thus, using antioxidant compounds is an important strategy to reduce these complications. This study aimed to investigate the possible effect of camphor on the serum biochemical parameters and oxidative parameters in the pancreas, liver, and kidney tissues of alloxaninduced diabetic rats. In this study, 40 male Wistar rats were divided into five groups, including normal group, diabetic group, the diabetic group treated with glibenclamide, the diabetic group treated with 30 mg/kg camphor, and the diabetic group receiving the camphor solvent. Intragastric administration of camphor and glibenclamide, as the control drug, to diabetic rats for 21 days lowered their blood glucose, total cholesterol, triglyceride, and LDL-cholesterol, while the blood high-density lipoprotein-cholesterol level was increased. In addition, our results indicated that treatment of diabetic rats with camphor increased the activity of glutathione peroxidase, catalase, and superoxide dismutase enzymes as well as reduced glutathione content in the liver, pancreas, and kidney tissues as compared to the diabetic rats. Based on our data, it can be concluded that camphor has a hypoglycemic activity, and this effect may be attributed, in part, to its antioxidant ability.