Tenshin Shōden Katori Shintō-ryū (天真正伝香取神道流) is one of the oldest extant Japanese martial arts and an exemplar of bujutsu. It was founded by Iizasa Ienao, who lived near Katori Shrine at the time. The ryū is purported to have been founded in 1447, but some scholars state that it was about 1480.

Japanese martial arts refers to the variety of martial arts native to the country of Japan. At least three Japanese terms are used interchangeably with the English phrase Japanese martial arts.