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The authors performed a cantilever iliac bone graft for the secondary correction of severe cleft lip–nose deformities after the completion of growth. For the purpose of clarifying effects of the cantilever iliac bone grafts and the adverse events with regard to their time course changes after this procedure, the authors retrospectively surveyed long-term morphologic changes in 65 cleft lip, alveolus, and palate patients in whom cleft lip–nose deformities were treated with a cantilever iliac bone graft (age at surgery: 14–45 years old). All postsurgical documents of facial photographs and radiologic images were reviewed to evaluate the effects and adverse events. The main adverse events were deviations of the apex of the nose, excess resorption of the grafted iliac bone, protruding deformations of the grafted iliac bone at the root of the nose, and fracture of the grafted iliac bone. Additional surgery was necessary in 10.7% of patients. Postsurgical changes in facial profiles became favorable, measured on lateral view of cephalometric radiography, achieving morphologic improvements. A cantilever iliac bone graft was effective for improving nasal deformities in cleft lip, alveolus, and palate patients, although the counter measures should be taken to these adverse events.