is a 1999 Japanese ninja-themed jidaigeki film directed by Masahiro Shinoda. It was co-written by Shinoda and Katsuo Naruse, and stars Kiichi Nakai. It is the second adaptation of Ryà Âtarà  Shiba's 1959 novel Fukurà  no Shiro, the first being the 1963 film Castle of Owls. Toho released the film on October 30, 1999, in Japan.
Nintendo was a production partner on the film, and the use of special effects and computer-generated imagery was widely touted in the film's marketing.