Gyokko-ryū (玉虎流) Jeweled Tiger School is a school of kosshijutsu (骨指術) kenjutsu, and bōjutsu. Gyokko-ryū is sometimes referred to as Gyokko Ryū Ninpo from a ninjutsu component it used to contain. According to the 1968 edition of the Bugei Ryuha Daijiten, Masaaki Hatsumi is the current Sōke (head master) of the Ryū which was passed to him by his teacher Takamatsu Toshitsugu.

Gyokko Ryu Koshijutsu techniques were brought to Japan from China during the Tang Dynasty by a Chinese monk called Cho Gyokko or Yo Gyokko. The ryu was passed down from generation to generation and was repeated until it was given to Sakagami Taro Kunishige. He organized the ryu and served as head from 1532 to 1555. The ryu was then passed to Momochi Sandayu. The Momochi family then passed the ryu to the Toda family and to Toshitsugu Takamatsu. Once, when Takamatsu was training with Shinryuken Toda, he was told that the most important thing for him to learn was the eight fundamental techniques called the Kihon Happo. These are the foundation stone for all Japanese martial arts. The Kihon Happo is made up of the basic pieces of the Gyokko ryu kata. Gyokko ryu is roughly divided into three sections: unarmed vs unarmed, unarmed vs knife, unarmed vs sword.