Baron Tsuda Mamichi (津田 真道?, 25 July 1829 – 3 September 1903) was a Japanese statesman,legal scholar in the Meiji period and a member of Japanese Freemasonry.He was one of the founding members of the Meirokusha with Mori Arinori,Nishimura Shigeki, Fukuzawa Yukichi, Kato Hiroyuki, Nakamura Masanao, and Nishi Amane.