Sunpu Castle (駿府城, Sunpu-jō) was a Japanese castle in Shizuoka City, Shizuoka Prefecture in Japan. The sobriquet of this feudal fortress was the "Castle of the Floating Isle." It was also referred to as Fuchu Castle (府中城, Fuchū-jō) or Shizuoka Castle (静岡城, Shizuoka-jō).