An experiment was conducted to evaluate the effect of different levels of Mannan-oligosaccharide (MOS) supplementation in the diets on carcass traits of broiler chickens. One hundred and eighty 7 d old Cobb-400 chicks were assigned to 3 treatment groups with 6 replicates of 10 birds in each treatment and managed uniformly up to 42 d. The basal diets in each group were supplemented with different levels of MOS i.e. M0 (control, without MOS), M0.5 (0.5% MOS of experimental diet), M1 (1% MOS of experimental diet). Carcass traits (dressing %, primal cuts, weight of organs, giblets, abdominal fat and sensory attributes remained similar among all the groups. Physico-chemical properties and nutritional composition of breast and thigh meat of broiler chickens remained comparable among the groups.