Deep neck infections, which affect soft tissues and facial compartments of the head and neck, have decreased after the development of chemotherapeutic agents and antibiotics. But these infections may still result in significant complications due to many causes. Authors have studied 25 cases of these infections from July 1984 to June 1989. The results were as follows ; 1) Sex ratio male to female was 5.3 : 1 and age varied from 2 months to 83 years old. 2) The most common site of infections was submandibular space 8 cases, parapharyngeal space 8 cases and abscess was formated more than cellulitis. 3) Origins of infections were dental disease 7 cases(32%), pharyngotonsillar disease 6 cases(24%) in orders. The most common organism was streptococcus 6 cases(35.3%) of 17 cases cultures. 4) Main symptom was neck swelling 16 cases(64%) and fluctuation was noted in 14 cases(56%). 5) The mean white blood cell count was 17,300/mm³. 6) Lateral soft tissue roentgenogram of the neck, CT scan and ultrasonography were valuable to early diagnosis and managements. 7) Average duration of onset was 7.5 days and mean duration of admission was 10.4 days. 8) These infections were managed with surgical drainage(13 cases, 52%), needle aspiration(2 cases, 8%), needle aspiration and tracheotomy(1 cases, 4%) and conservative treatment(9 cases, 36%) without any complications.