The research target of this study was to investigate the effect of Moringa oleifera leaf extract on growth performance, antioxidant status and some biochemical parameters of broiler chickens. Two hundred and forty unsexed day-old Evian broiler chicks were divided to control and three experimental groups. Each group had three replicates with 20 birds per replicate. The groups were received water as follows; C received 0.0 ml moringa leaf extract per 1 liter water (Cont), T1 received 90 ml moringa leaf extract per 1 liter water (90MOLE), T2 received 135 ml moringa leaf extract per 1 liter water (135MOLE), T3 received 180 ml moringa leaf extract per 1 liter water (180 MOLE). The results showed that final weight, weight gain, feed consumption, feed conversion ratio, liver function, lipid profile and antioxidants indicators were significantly (p<0.05) improved by moringa leaf extract supplementations. The data showed that T2 (135 ml moringa leaf extract /1 liter water) had the best values.