Introduction: Oxidative stress plays a key role in the pathogenesis of late diabetic complications, the markers of which could be improved by the beneficial effects of legumes. Materials and Methods: In this randomized crossover trial, 24 overweight subjects, aged 50-80 years, with type 2 diabetes, were selected. We aimed to determine the effects of non-soybean legumes consumption on oxidative stress markers such as ox-LDL (oxidative LDL), MDA (Malonedialdehyde) and TAC (total antioxidant capacity) in type 2 diabetic patients. The subjects were randomly assigned into two groups, receiving two diets – the TLC (controls) or the TLC diet with legumes (receiving 2 servings of legumes instead of meat three days of the week in the TLC diet). Duration of each diet was 8 weeks with a 4 week wash-out period. At the beginning and end of each dietary period, fasting plasma glucose, ox-LDL, MDA, TAC and weight were measured. Results: After the nutritional intervention, diabetic patients, those individuals who followed the legume-based TLC diet had significant reduction in ox- LDL (-3.1±0.5 vs. -0.7±0.4 P=0.003) and MDA (-1.1±0.2 vs. -0.3±0.1 P=0.006),  but no change was observed in the TAC and BMI of the case and control groups. Conclusions: The legume-based TLC diet improves oxidative stress markers in diabetic patients, compared to the legume-free TLC diet.