To determine the effect of green tea on the intestinal morphology and nitric oxide production, broiler chicks were reared since they were a day old and supplemented by 2% and 4% green tea for 4 weeks. Serum amounts of NO metabolites in the green-tea-supplemented groups were lower than controls but were only significant (P < 0.05) in 4% green tea-supplemented group. The duodenum villous length and surface area were significantly (P < 0.05) greater in the group supplemented by 4% green tea than control. It was observed significant (P < 0.05) decreasing of lamina propria and increasing of muscle layer thickness at the duodenum villous in the green tea-supplemented groups. The jejunum villous length and surface area significantly (P < 0.05) increased in green-tea-supplemented groups compared with control group. In conclusion, green tea supplementation reduces NO metabolites (as free radical) and increases most of the intestinal architecture in the growing broiler chickens.