Tessenjutsu is the martial art of the Japanese war fan (tessen). It is based on the use of the solid iron fan or the folding iron fan, which usually had eight or ten wood or iron ribs.

The use of the war fan in combat is mentioned in early Japanese legends. For example, Yoshitsune, a hero of Japanese legend, is said to have defeated an opponent named Benkei by parrying the blows of his opponent's spear with an iron fan. This use of the iron fan was taught him by a mythological creature, a tengu, who had also instructed him in the art of swordsmanship.

The practitioners of tessenjutsu could acquire a high level of skill. Some became so skilled, in fact, that they were able to defend themselves against an attacker wielding a sword, and even kill an opponent with a single blow. Like so many other Japanese arts of combat during this era, tessenjutsu reached a high level of sophistication.

Apart from using it in duels against enemies armed with swords and spears, the skilled wielder could also use it to fence and fend off knives and poisoned darts thrown at him. Like a sword, the tessen could be dual-wielded to parry with one hand and attack with the other.

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