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Skeletal Class II malocclusion with mandibular retrognathia is a common dentofacial deformity affecting facial esthetics, occlusal function, and psychosocial well-being. Management of growing patients presenting with moderate skeletal discrepancies requires careful evaluation of growth potential and long-term treatment planning. The current case reported the diagnosis and proposed orthodontic–surgical treatment plan for a 13-year-old patient presenting with a Class II skeletal pattern characterized by mild-to-moderate mandibular retrognathia, increased ANB angle, convex facial profile, mild positive overjet, and a Class II dental relationship. Following comprehensive clinical and cephalometric assessment, a three phase treatment approach was planned, consisting of pre-surgical orthodontic decompensation, mandibular advancement surgery through bilateral sagittal split osteotomy (BSSO) after skeletal maturity, and post-surgical orthodontic finishing. Post-treatment outcomes included normalization of skeletal relationships, improvement in facial profile, establishment of Class I occlusion, reduction of facial convexity, and enhancement of soft tissue balance. The study emphasized the importance of interdisciplinary planning in managing skeletal Class II malocclusion.