Chondro-osseous respiratory epithelial adenomatoid hamartoma (COREAH) is an extremely rare type of hamartoma. To the best of our knowledge, only 1 case has been previously reported. A 7-year-old girl presented with a case of COREAH of the bilateral nasal cavities. Polypous masses in both nasal cavities were resected endoscopically, and they were histologically diagnosed as COREAH. A large polypous mass recurred 1 year postsurgically on the right side only. A second endoscopic surgery was performed, and the lesion was confirmed to be recurrent COREAH. Hamartoma of the nasal cavity is rare and is generally considered to be self-limiting. This case suggests that nasal hamartomas may have neoplastic characteristics, and therefore require complete resection.