The study was conducted in the poultry field, College of Agriculture, Al-Muthanna University from 1/3/2018 to 6/4/2018 to determine the effect of commercial Ascomax powder produced from seaweed (Ascophyllum nodocum) on some productive performance of broilers. A total of 400, one day, Ross 308 broiler chicks were used for 35 days. The chicks were randomly distributed to 4 treatments, four replicates per treatment (25 chick / replicate). The treatments were as follows: T1: (control treatment), while T2, T3 and T4 added diet by Ascomax powder by 1, 1.5 and 2 g per 1 kg of the basal diet, respectively. The results of the study showed a significant superiority (P <0.05) for the added Ascomax powder treatments compared to the treatment of control in the weekly body weight and weight gain, while the treatment T4 exceeded the rest of treatments in the cumulative of weight gain, there was also a significant increased (P<0.05). For T2, T3 and T4 treatments compare with the control treatment of feed consumption, cumulative feed consumption and feed conversion factor, while the control treatment was significantly higher (P<0.05) in the mortality, as for the production index in the addition treatments were significantly superior to (P<0.05) compare with the control treatment.It is concluded that the addition of Ascomax commercial powder has improved the productivity of broilers.