Shōzō Tanaka was a Japanese politician and social activist, and is considered to be Japan's first conservationist. Tanaka was politically active in the Meiji Restoration and leader in the Freedom and Popular Rights Movement. In Japan's first general election of 1890, he was elected to the House of Representatives as a member of the Rikken Kaishintō, a liberal political party. He is most well known for his advocacy of rural residents around the Watarase River whose health and livelihoods were negatively effected by pollution from the Ashio Copper Mine in the 1880s. Tanaka also contributed to philosophical thought on nature in the early Meiji era.