Medicinal plants have been used in the treatment of some diseases like diabetes. One of them is doum fruit extract. The study was conducted to evaluate effect of doum fruit extract on some biochemical parameters, including enzyme activities and histopathological changes of pancreas in alloxan induced diabetic rats. Animals were allocated into five groups of rats, two groups, several as control (one normal and one diabetic rats) and the other three groups were induced diabetic with doum extract (0.5, 1 and 2 g/kg b•wt) which were given every other day by stomach tube for 6 weeks. Evaluation was made for glucose, insulin, lipid profile, enzyme activities, antioxidant activity and histopathological changes of pancreas. The results showed that doum fruit extract decreased blood glucose, insulin, total cholesterol (TC), triglyceride (TG), total lipid (TL), low-density lipoprotein cholesterol (LDL-C), lactate dyhadreygenase (LDH), alanine and aspartate amino transferase (ALT, AST), alkaline phosphatase (ALP) and Malondialdehyde (MDA) while plasma catalase activity and high density lipoprotein cholesterol (HDL-C) were significantly (p < 0.05) increased. Therefore, the results of this study demonstrated that the active compounds present in the doum extract have a positive effect on the biochemical parameters of diabetic rats.