Obu Toramasa (飯富 虎昌, 1504 – November 11, 1565), known as the "Wild Tiger of Kai", was a Japanese samurai of the Sengoku period, who served the Takeda clan. He was known as one of the "Twenty-Four Generals of Takeda Shingen".^[1] His younger brother was Yamagata Masakage.^[2]

He was the tutor of Takeda Shingen's younger brother Takeda Nobushige. He later betrayed Shingen with Shingen's eldest child, the rebellious Takeda Yoshinobu. A historically accurate account of his life is in the novel The Samurai's Tale written by Erik Christian Haugaard.