Ameloblastoma is a rare neoplasm of the mandible and maxilla of odontogenic epithelial origin. It has multiple histologic variants. Most common subtype is the multicystic variant of ameloblastoma while its another variant unicystic ameloblastoma (UA) is relatively uncommon which usually occur in younger populations. In this article, we report a case of Unicystic Ameloblastoma in a 22 year old female which was provisionally diagnosed as dentigerous cyst based on clinico - radiographic features and was treated conservatively. Detailed microscopic examination revealed features of Unicystic ameloblastoma which requires long term follow-up to check for recurrence.