In this study was conducted to effect of expander corn supplementation of different levels to diet on performance in broilers. A 6-wk experiment, 390 unsexed day-old broiler chicks (Ross 308) was used in the experiment. Five treatments consisting of different expander corn levels (0, 25, 50, 75 and 100 %) were used with six replicates of seventy-eight chicks each treatment. Feed and water were supplied as ad libitum during the experiment. Different levels of expander corn addition to broilers diet were not significantly effect on body weight, body weight gain, feed intake, carcass weight and yield at the end of the experiment. Different levels of expander corn addition to broilers diet were significantly effect on feed conversion ratio. Feed conversion ratio was significantly decreased with dietary containing 75 and 100 % expander corn (P<0.05). The result of this study that containing to 100 % corn expander instead of corn to broiler diets can be used without adversely affecting performance.