Odontomas are the most common non aggressive odontogenic tumors of the jaws .They are usually asymptomatic and are diagnosed routinely on radiological examination. According to WHO classification (2005) two types of odontomas are found: complex odontomas and compound odontomas, the latter is more common than the former .The eruption of odontomas in the oral cavity is infrequent very rare occurrence and few cases are reported in the literature .Thus this article focuses on an erupted complex odontoma associated with impacted third molar which adds to the previously reported cases in the literature.