Shiranui-ryū (不知火流?) is a traditional school of Japanese martial arts. It was created by Kawakami Gensai in the 1860s, following his study of swordsmanship under the samurai Todoroki Buhei (轟武兵衛?). Shiranui-ryū was characterized by high speed. Kawakami Gensai was its only practitioner as he was executed in 1872.