Odontomas are the most common variety of odontogenic tumors and derived from differentiated epithelial and mesenchymal cells. Traditionally, odontomas have been classified as benign odontogenic tumors and are subdivided into complex or compound odontomas morphologically. This paper describes the case of a complex odontoma in a 10-year-old girl diagnosed after extraction. A surgical excision was performed and the histopathological examination revealed a complex odontome. They usually cause delayed eruption, so early detection and treatment of odontomas could decrease the possibility of late eruption or even tooth impaction due to overlying odontomas.