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The ossifying fibroma is relatively uncommon slow growing expansile and encapsulated benign fibro-osseous tumor. This paper presents two cases of ossifying fibroma of the mandible found in 25 and 35 years old females who attended Dental Department of Bir Hospital for evaluation of a bony swelling over the body of the mandible of 14-9 months duration respectively. On examination, both cases had a bony swelling with mild pain, mild to moderate facial asymmetry and displaced teeth at the tumor area. Radiolographically well demarcated radiolucent area were observed where one lesion showed pseudo-bilocular radioluscency and other showed areas of radio-opacity over the radioluscent area. The excisional or enucleation biopsy was performed and histopatholgical examination found proliferation of the fibrous tissue with focal ossification suggesting ossifying fibroma of the mandible. This paper presents two cases and a belief discussion regarding controversy in diagnosis of ossifying fibroma as compared to other related fibroosseous lesions although they have separate entity.