Orthognathic Surgery is considered for the treatment of Dentofacial deformities for more than 100 years. "Treating skeletal deformities is really surgical work, with the earlier involvement of orthodontist in the surgical cases, better will be the treatment outcome." Although much has changed in the field of orthognathic surgery since the early 1900s the role of an orthodontist in achieving an ideal result remains integral. This book emphasizes on role of orthodontist in orthognathic surgery which can be divided into several phases: the initial evaluation, presurgical orthodontics, surgical planning, and postsurgical orthodontics. Also addresses Surgery First Orthognathic Approach (SFOA), 3-Dimensional Imaging and Computer-Assisted Surgical Planning being the most recent advances.