The Bujinkan () is an international Ninja organization based in Japan and headed by Masaaki Hatsumi, that trains their students in the combat martial arts and unconventional warfare tactics of the Ninja. The system taught by this group, called Bujinkan Budō Taijutsu, consists of nine separate martial arts traditions. The Bujinkan organization incorporates the teachings of nine martial arts lineages (ryūha): The head of the Bujinkan organisation, Masaaki Hatsumi, is the lineage holder of several ryūha taught in the Bujinkan, transferred to him in the middle of the 20th Century by his teacher Takamatsu Toshitsugu.