Gokenin Zankurō (御家人斬九郎) is a novel by Renzaburō Shibata. The protagonist of this jidaigeki is Matsudaira Zankurō, a low-ranking gokenin in the service of the Tokugawa shogunate. He lives with his mother Masajo in the shogunal capital of Edo. Other characters include his fiancée Matsudaira Sumi, old friend Nishio Denzaburō, and favorite geisha Otsuta.