The Tosa Domain (土佐藩 Tosa han ) was a feudal domain in Tosa Province of Japan (present-day Kōchi Prefecture) during the Edo period. Its official name is "Kōchi han" (高知藩 ). Some from the domain played important roles in events in the late Tokugawa shogunate. Among them are Sakamoto Ryōma, Yui Mitsue, Gotō Shōjirō, Itagaki Taisuke, Nakae Chōmin.