The odontogenic fibroma is a rare, benign, central mesodermal tumor of odontogenic origin which may be found in the maxilla or the mandible, only a few cases have been reported in the dental literature. Recently, the authors has experienced a case, 14-year-old male, who complained of painless and progressive swelling in the left canine vestibular region and had unerupted left upper canine and premolar teeth. The tumor mass was extirpated completely through the left maxillary sinusotomy by means of Caldwell-Luc's approach. Diagnosis, odontogenic fibroma, was confirmed with histopathological study.