The Bujinkan (Japanese: 武神館) is an international martial arts organization based in Japan and headed by Masaaki Hatsumi. The combat system taught by this organization comprises nine separate ryūha, or schools, which are collectively referred to as Bujinkan Budō Taijutsu. The Bujinkan is most commonly associated with ninjutsu. However, Masaaki Hatsumi uses the term Budo (meaning martial way) as he says the ryūha are descended from historical samurai schools that teach samurai martial tactics and ninjutsu schools that teach ninja tactics.

The Bujinkan organization incorporates the teachings of the martial arts lineages (ryūha) that Masaaki Hatsumi learned from Takamatsu Toshitsugu under the banner of Bujinkan Budo Taijutsu. These are:

At around the time of Hatsumi's 88th birthday (Beiju: ja:米寿) on 2 December 2019, he announced his successors for most of the above schools:

Bujinkan Budō Taijutsu training does not include participation in competitions or contests, as the school's training aims to develop the ability to protect oneself and others using techniques that focus on disabling an attacker (and/or removing their desire/ability to continue) as quickly and efficiently as possible.

This training is conducted in a manner in which there are predefined "attackers" (tori) and "receivers" (uke) similar to drills in judo (gokyo) or traditional Japanese martial arts. However, the Bujinkan differs from many traditional martial arts in that the training progresses through the following stages:

Training is done in a manner that entails little risk of permanent injury.

The Bujinkan does not adhere to any official guideline or set of rules to limit actions or techniques used during training. The approach used in the Bujinkan includes gaining compliance through pain and utilising potentially damaging techniques in order to survive dangerous situations rather than focusing on winning a competition or evenly matched duel. As a result, many of the staple responses of a Bujinkan student would be inappropriate in most competitions, but in ring environment the principles of the training can be employed. One mainstay criticism of Bujinkan training, which is a misconception is that it does not necessarily involve testing techniques (locks, throws, chokes, strikes, etc.) against a fully resisting opponent. This is purely subjective to the instructor and individual practitioner. Bujinkan is widely practiced and utilized by law enforcement, government agencies, military and military contractors, and those in private security.

The Bujinkan largely focuses on “taijutsu” (body movement / skills) as well as other skills of ninjutsu (ninpo tactics and strategies) and happo biken jutsu (various modern and traditional weapons) - this is The Bujinkan's branch of Kukishin-ryū