Clinical studies of 36 patients with papilloma of the nasal and sinonasal sinuses were performed. We treated 25 men and 11 women with an average age of 55.1 years. Chief complaints were nasal obstruction. Histology showed 11 cases of squamous cell papilloma and 25 cases of sinonasal papilloma. Sinonasal papilloma were classified into three histopathological types : exophitic papilloma, inverted papilloma and cylindrical cell papilloma. In this study, inverted papilloma was the most common type. Inverted papilloma occurred primarily in the internal wall of the maxillary sinus. The recurrence rate was 9.7% (3 cases), one case was squamous cell papilloma with sinonasal papilloma, and two cases were inverted papilloma. Four cases (11.1 % ) showed malignant transformation.