This study aimed to evaluate the effect of curcumin supplementation on growth performance, carcass parameters, behavior characteristics, blood metabolites, antioxidant status, and tissue histomorphology in heat-stressed broiler chickens. 120 one-day-old chicks were reared over 35 days in two separate rooms; one designated to induce heat stress and the other to maintain a normal temperature. After a completely randomized design, birds were divided into four treatments, each with 6 replicates of 5 chicks. Treatments were thermoneutral control group fed basal diet, heat-stressed group fed basal diet, curcumin-supplemented group fed basal diet with 1g/kg curcumin, and curcumin-supplemented heat-stressed group fed basal diet with 1g/kg curcumin.