This chapter deals with ankylosis of TM Joint. The chapter describes various classifications of ankylosis of TM Joint, etiopathology, pathogenesis, and clinical manifestations of unilateral and bilateral ankylosis. The chapter contains classification and etiopathology in tabulated forms and good clinical photographs of patients having unilateral and bilateral ankylosis. The chapter also describes the methods of diagnosis with the help of radiographs. The chapter also contains the management of ankylosis, covering all the aspects of surgical management. The authors have dealt with various surgical techniques, internationally accepted protocols for TM Joint ankylosis, artificial replacement of the joint, complications of TM Joint surgery and Frey’s syndrome, again with good photographs and radiographs.