The presenting characteristics and clinical courses of 23 patients with upper and lower jaw bone infections are investigated. Two patients had the osteomyelitis in the maxilla and 21 in the mandible. Nine of the patients had post-traumatic osteomyelitis, eight had odontogenic osteomyelitis and six had post-operative osteomyelitis. Most infections were polymicrobial (86%). Cases with mandibular osleoradionecrosis were not included in this study. All of the patients had chronic osteomyelitis. The follow up period ranged from six weeks to two years. In this paper, diagnosis, etiology, clinical and radiological features, anatomical distribution and treatment of the lesions are reported.