Ossifying fibroma is a benign bone neoplasm often considered to be a type of fibro-osseous lesion. Its origin is believed to be from periodontal membrane, and it shows more predilection toward females. Mandible is more commonly affected than maxilla. This bone tumor consists of highly cellular, fibrous tissue that contains varying amounts of calcified tissue-resembling bone, cementum, or both. Radiographically, the lesions are either completely radiolucent or mixed, depending on the amount of calcification, or are completely radiopaque and surrounded by a radiolucent rim. Ossifying fibroma requires radical surgery, because of the tendency for recurrence and possibility of malignant transformation. Here, we have presented a case of massive ossifying fibroma of mandible in an 80-year-old female.