Nishio Castle (西尾城 Nishio-jō) is a Japanese castle located in Nishio, eastern Aichi Prefecture, Japan. At the end of the Edo period, Nishio Castle was home to the Ogyu Matsudaira, daimyō of Nishio Domain. The castle was also known as Tsuru-jō (鶴城?), Tsuruga-jō (鶴ヶ城?), or Saijo-jō (西条城?).