Clinical facts along with radiological and histological findings are imperative to appropriately diagnose lesions of the jaws. Osteoblastoma is an uncommon, benign, primary lesion of the bone that rarely occurs in the jaw. It presents in the body/ramal region of the posterior mandible and mimics several other swellings which may present at this site. Clinico-pathologically and radiographically there are several lesions that present with almost similar features. The authors present one such case of a large osteoblastoma in an elderly female stressing the importance of correctly diagnosing these lesions.