Baron Matsumoto Jun (松本 順) (born Sato Junnosuke (佐藤 順之助); July 13, 1832 – March 12, 1907), previously known as Matsumoto Ryōjun (松本 良順), was a Japanese physician and photographer who served as the personal physician to the last shōgun, Tokugawa Yoshinobu. Foreign Minister Hayashi Tadasu was his brother and Navy Minister Enomoto Takeaki was his distant relative.