Yagyū Munefuyu (柳生 宗冬, 1613 – November 16, 1675) was a daimyō and a teacher of kenjutsu and military strategy in Japan during the Edo period.
His younger brother was Retsudō Gisen, the real person who is fictionalized as Yagyū Retsudō, leader of the Ura-Yagyū (Shadow Yagyū), in Lone Wolf and Cub.
In 1668 he rose to the rank of daimyo of the Yagyū Domain when he received an additional grant of land, bringing his holdings above the 10,000 koku minimum.
Initially weaker than his brothers and father, a kōa tells how Munefuyu managed to become an expert after training his zanshin (vigilance) for several years in a temple.
Despite his success and fame, he was defeated in a single stroke by Yagyū Renya Toshikane (fourth headmaster of the Yagyū Shinkage-ryū), who had previously fought, before Tokugawa Yoshinao lord of Owari, over 30 duels without being hit.