Baron Tsuda Mamichi (津田 真道, 25 July 1829 – 3 September 1903) was a Japanese statesman and legal scholar in the Meiji period.

He was one of the founding members of the Meirokusha with Mori Arinori, Nishimura Shigeki, Fukuzawa Yukichi, Kato Hiroyuki, Nakamura Masanao, and Nishi Amane.

In 1862, he was selected, together with Nishi Amane, by the government for training in the Netherlands in western political science, constitutional law, and economics.

The two Japanese students were put in the care of Professor Simon Vissering, who taught Political Economy, Statistics and Diplomatic History at the University of Leyden.

After his return to Japan in 1868, Tsuda wrote the Kaisei Kokuho ron (On Western Law), which was the first book in Japanese on the subject.