Yamakawa Futaba (山川 二葉) (1844 – November 14, 1909) was a Japanese educator of the early Meiji era. Born in Aizu, she was the sister of the karō, Yamakawa Hiroshi; her other siblings included physicist Yamakawa Kenjirō and Meiji-era social figure Ōyama Sutematsu. Futaba took part in the defense of Tsuruga Castle in the Boshin War (1868-9). She was also briefly married to Kajiwara Heima, another Aizu karō.