Osteoma is a benign, slow-growing osteogenic lesion that sometimes arises from the maxillofacial region, such as the sinus, temporal or jaw bones. Osteoma of the mandible is a rare entity with very few cases reported in the literature. This paper reports an additional case of osteoma in the mandible in a 21-year-old male patient. The purpose of this paper is to present clinical, radiographic, surgical and histopathological features of an osteoma of the mandible and treatment of this lesion.