The Isshin Dojo (一心道場 Isshin Dōjō?) is a kenjutsu school, a school of Japanese swordsmanship. Its owner is Koshiro, who is a skilled swordsman and father of the deceased Kuina. It is the place where Zoro trained his Santōryū and is the only dojo Zoro did not take down the sign of.
It is revealed that 12 years before the current storyline the town was visited by Monkey D. Dragon and the Revolutionaries, and that the dojo assisted them with supplies for the injured residents of Gray Terminal.
