This research was performed to determine the effect of plantago (Plantago Lanceolate) added 0, 1, 3, 5% into diet groups (n=6 each) on the number of mast cells in some organs of the digestive system in male quails (n=24, in total). In digestive system of quails, the appropriate pieces of tissue samples were taken from the proventriculus, duodenum, jejunum and ileum, and fixed in Mota’s basic lead asetat solution for 24 h and after histological tissue processing, embebbed in paraplast. The sections of 6 μ in thickness were stained with toludine blue (0.5%) at pH 0.5. When distributions of mast cells in the lamina propria, submucosa, tunica muscularis plus tunica serosa were examined, it was observed that most of the mast cells were located within the submucosal layer. In the organs examined, the highest number of mast cells were found in the proventriculus. It was determinded that plantago added into diets increased the number of mast cells in male quails