The mandibular body ostectomy is indicated for the correction of select cases of; Mandibular prognathism, Class III open-bite deformity, Anterior crossbite in the adult. The anterior body ostectomy is indicated primarily in selected cases of mandibular prognathism, class III malocclusion when the posterior teeth are not in crossbite or the crossbite is dental in nature and can readily be resolved with conventional orthodontics. As with the correction of other dentofacial deformities, carefully done model surgery and a cephalometric prediction tracing are imperative in planning the anterior body ostectomy. In this paper, a case of mandibular prognathism which is corrected by the technique of anterior body ostectomy is presented.