Supracondylar fracture of the humerus is a common injury in the pediatric patient. A less common complication is the development of myositis ossificans. Although frequently cited as a possible complication, there are few reported cases of this occurring in the pediatric patient. We present a case report of a 8 year old boy who developed myositis ossificans after a supracondylar fracture of the humerus. After one year of the injury, we could ascertained radiologically complete maturation of the mass which developed in front of the distal humerus and markedly made motion of the elbow joint limited. We could obtain further motion through the surgical resection and then physical therapy. Now, eleven months have lapsed since the mass was removed, the range of motion is almost normal, and the recurrence of myositis ossificans is not existed.