Dentofacial deformity describes skeletal abnormalities affecting the maxilla, mandible, or both jaws which ranges from a dental malocclusion to cleft lip and palate, including other disfiguring craniofacial syndromes such as tumors as well as trauma induced deformities. This case report elucidates single stage surgical correction of gnathic deformity caused by maxillofacial fibrous dysplasia and class III dentofacial deformity in a young adult female patient. Simultaneous treatment for both tumour and class III dentofacial deformity was done by surgery first approach with conservative contouring of dysplastic bone. A symmetrical, harmonious relationship of the facial soft tissue and a pleasant profile was obtained after treatment. This case demonstrated that orthognathic surgery can safely be performed simultaneously with surgical recontouring in fibrous dysplasia cases with excellent outcome.