The present study investigated the effects of the honey bee product propolis on broiler performance and digestibility of nutrients (dry matter, organic matter, ether extract and crude protein). For this purpose, two experiments were conducted. Fourty nine and fourty eight day-old male broiler chicks (Ross-308) were used in experiments 1 and 2, respectively. Chicks were divided at random into 7 and 4 treatment groups in the first and second experiments, respectively. Propolis was supplemented to diets at levels of 500 or 2000 ppm in experiment 1 and the level of it was increased to 4000 ppm in experiment 2. Chicks were fed with these diets from 0 to 3, 4 to 6 or 0 to 6 weeks of age in both experiments.