Primary intraosseous carcinoma is a very rare neoplasm arising from the cell rests of odontogenic epithelium with no communication to surrounding mucosa. These can be arising from an existing odontogenic lesion and extend within the jaw bone.Because of this, the dentist is now more accountable for making the correct diagnosis and should focus on the entire maxillomandibular complex. Few of similar malignant transformation have been documented in literature as well but the presence of primary intraosseous carcinoma has been reported infrequently. Here, we report a case of primary intraosseous carcinoma in a 80 year old male patient with gross destruction of hemimandible with local metastasis.