Benign osteoblastoma represents less than 1% of all bone tumors. More than 80% of the lesions occur in the vertebrae and bone of extremities. This tumor is extremly rare in the facial bones. Approximately 3% involve the skull base and mandible. Only several cases of benign osteoblastoma of the paranasal sinuses have been recorded in the world literature. The majority of tumors occurs in individuals under the age of 35 years, and dull localized pain is the outstanding complaint. Since the tumor is benign, conservative surgery is curative in about 80-90% of the cases. The report 2 cases of benign osteoblastoma, one arising in the frontal sinus and another in the maxillary sinus. The tumors were removed by curettage and local excision, and results were favorable. Related articles were reviewed and brief discussions were made.