This experiment was conducted to evaluate the efficacy of garlic (Allium sativum) extracts supplementation in drinking water as a growth promoter of broiler chicken. A total of 60 one-day-old male Lohman meat broiler chicks were distributed over two groups of 30 chicks with three replicates of 10 birds. Group B was supplemented with garlic extract from water and Group A kept as a control. Weekly observations were recorded for live body weight gain up to 4^th weeks and hematological tests were performed at 30^th days. Live weight and weight gain of the treatment group were significantly (p<0.05) higher than that of the control group. Significant (p<0.05) higher values also observed in terms of weight of heart, liver, spleen, and pancreas for the treatment group. The value of TEC and PVC of treatment group showed significant (p<0.05) differences. The results suggest that better growth performance could be achieved in broilers with feed supplemented with garlic extract.