Tanno Setsu (Japanese: 丹野セツ, 1902 – 1987) was a Japanese feminist, labor activist, Kameido Incident survivor, and an active member of Communist and Socialist Tokyo groups in the 1920s. Tanno became a member of the , and was especially interested in its communist Hyōgikai wing where she established and was head of its women's division. Though many of her communist peers shifted to anarchist communism, Tanno and her husband, Watanabe Masanosuke, the Japanese Communist Party's general secretary, remained Bolshevist communists.