Hattori Hanzo (1541 – 1596), also formerly known as Masanari or Masashige, the son of a certain Hattori Yasunaga, was a head of clan from Iga region of Japan, famous for its Ninja, including Hattori; he served Tokugawa Ieyasu loyally and well. He is commonly depicted as such in manga and novel fiction. Hanzo was born a samurai vassal of the Matsudaira (later Tokugawa) clan; he would later earn the nickname Oni no Hanzo (Devil Hanzo) because of the ferocity he displayed in battle. His nickname distinguishes him from another Tokugawa samurai, Watanabe Hanzo, called Hanzo of Spear.

In the movie, Hanzo is portrayed by Sonny Chiba, who helps The Bride in extracting her revenge by making her a Hattori Hanzo sword.