Pediatric obstructive sleep apnea syndrome (OSAS) is primarily caused by adenotonsillar hypertrophy. However, tongue base hypertrophy is increasingly being recognized as a cause, even after adenotonsillectomy. We report three cases of pediatric OSAS successfully treated by transoral robotic reduction of the tongue base. In all children, we were able to achieve improved retrolingual patency while avoiding significant procedure-related morbidity. In conclusion, tongue base reduction by transoral robotic surgery appears to be a feasible solution for the base of tongue obstruction due to lingual tonsil hypertrophy in pediatric patients.