This study was carried out to investigate the distribution and density of mast cells in larynx, trachea and bronchus mucosas of quail. The samples taken from larynx, trachea and bronchus belong to the ten adult quails were used as the material. The Standart toluidine blue staining method was applied to the sections for determination of the mast cells. Consequently, it was defined that the mast cells was more numerous in the larynx mucosa than trachea and bronchus mucosas. Also we observed that the mast cells were distributed around the blood vessels and in the muscle layer.This study was carried out to investigate the distribution and density of mast cells in larynx, trachea and bronchus mucosas of quail. The samples taken from larynx, trachea and bronchus belong to the ten adult quails were used as the material. The Standart toluidine blue staining method was applied to the sections for determination of the mast cells. Consequently, it was defined that the mast cells was more numerous in the larynx mucosa than trachea and bronchus mucosas. Also we observed that the mast cells were distributed around the blood vessels and in the muscle layer.