This study was aimed to determine the effect of different levels of clove extract supplementation in diets on carcass characteristics, digestive organ size and total coliform counts of small intestine in broilers and to determine whether it could be alternative to antibiotic feed additives or not. Three hundred 3-day-old commercial broiler chicks (Ross–308) were divided into groups of 60 birds in each and randomly assigned to the five treatment diets with three replicate. Experimental groups were; consuming the basal diet (Control group) or the basal diet supplemented with 100, 200, 400 ppm of clove extract 10 ppm avilamycin. Experiment was continued 42 days. Except abdominal fat ratio (P<0.05), carcass characteristic and digestive organ weights were similar in all groups (P>0.05). Supplementing antibiotic and 400 ppm clove extract have been decreased the total coliform microorganism counts at 21^st and 42^nd days of the experiment (P<0.001). Clove extract has the positive effects on microbial population of gut and fat deposition of organism and it is natural and safety feed additive so that supplementation of 400 ppm clove extract to diets can be considered as an alternative natural growth promoter for poultry instead of antibiotics.