This paper, describes the endoscopic repair of unilateral choanal atresia with the KTP laser, a one-stage procedure, with no requirement for stenting. Three patients are presented with unilateral choanal atresia, aged six, nine and 38-years-old. The procedure combines the excellent endoscopic visualization, with the good haemostatic and penetrating properties of the KTP laser. Follow up was between 12 months and four years with all choanae remaining patent, no dilatation was required. No surgical complications were noted.