Sakaino Ryôun was a Kumamoto han retainer.
He is known for reviving the tradition of dog-hunting, alongside Saitô Shizan, and came to serve as a hunting teacher. He was appointed machi bugyô (town magistrate) of Kawajiri in 1798, with a stipend of 350 koku.
- Ono Masako, Tomita Chinatsu, Kanna Keiko, Taguchi Megumi, "Shiryô shôkai Kishi Akimasa bunko Satsuyû kikô," Shiryôhenshûshitsu kiyô 31 (2006), 220.
- "Sakaino Ryôun," Nihon jinmei daijiten, Kodansha.