Fracture of the clavicle, one of the most common bony injuries, rarely requires open reduction. We experienced 6 cases of clavicle nonunion, treated at the Department of Orthopedic Surgery of Seoul National Medical Center from Jul. 1987 to Feb. 1990. This study focused on predisposing factors in relation to nonunion of clavicle and surglcal treatment. Among the six patients, four patients were male and two patients were female, and their ages ranged from 20 to 63 years. All six patients wert treated with semitubular plating with bone graft. All patients achieved good union by the average 13 weeks postoperatively and symptoms disappeared. It was concluded that symptomatic nonunion of clavicle could be treated by operation, and internal fixation with compression plate is thought to be a reliable treatment for the nonunion of the clavicle.