Class III malocclusion, resulting from mandibular prognathism, maxillary retrusion, or a combination, can severely affect function and facial aesthetics. While mild forms respond to orthodontic camouflage, severe skeletal discrepancies in adults usually require surgical correction. This report presents two adult cases treated with Le Fort I maxillary advancement and bilateral sagittal split osteotomy (BSSO) setback, followed by post-surgical orthodontic finishing to ensure occlusal stability and facial harmony. Orthognathic surgery not only corrected the skeletal disharmony and improved masticatory function but also enhanced patient self-esteem and quality of life, emphasizing the importance of coordinated orthodontic–surgical planning.