In this study, the effects of essential oil isolated from orange peel (OEO) added to broiler diets on the performance were examined. In the research, 432 broiler chickens were used and the experiment lasted for six weeks. In the experiment, 0 (1st group), 50 (2nd group), 100 (3rd group) and 150 mg/kg (4th group) of OEO (Citrus sinensis L.) were added to broiler diets and 4 different diets were used. The effect of OEO added to broiler diets on the live weights were found significant (P<0.05), except for 1st and 5th weeks. The more the doses of the OEO were the more the live weights increased, the dose of 150 mg/kg had the maximum increase. Feed intake was found significant (P<0.05), except for the 2nd week. The addition of 150 mg/kg of OEO improved the feed efficiency (P<0.05). Carcass weight, carcass yield, things, breast, back, wing, abdominal fat and heart weights significantly increased (P<0.05) as OEO dose added to diets increased.