Mikogami Tenzen (神子上典膳) or Ono Jiroemon Tadaaki was a Japanese samurai of the early Edo period, who was renowned as a swordsman. He founded the Ono-ha Ittō-ryū style of swordsmanship after his teacher made him head master of the Ittō-ryū. He was one of two official sword masters for Tokugawa Ieyasu and his style, along with Yagyu Shinkage-ryu became one of the official ryūha of the Tokugawa Shogunate.