Okada Izō, Japanese samurai (born 1838)

Okada Izō was a Japanese samurai of the late Edo period, feared as one of the four most notable assassins of the Bakumatsu period. He was a member of Tosa Kinnoto in his hometown, Tosa Domain. Izō and Tanaka Shinbei were active in Kyoto as assassins under the leadership of Takechi Hanpeita.