Narushima Ryūhoku (成島柳北) was a Japanese author and scholar who lived from 1837-1884. He was born in Asakusa, and his given name was Korehiro (惟弘). The Narushima family were okujusha (奥儒者), or Confucian tutors to the Tokugawa shoguns, who were also involved the editing of Tokugawa jikki (德川實紀）and other historical annals, including the (後鑑 Nochikagami）. Ryuhoku participated in these editing projects as a young man.