Kumamoto Castle (Kumamoto-jō) is a hilltop Japanese castle located in Chūō-ku, Kumamoto in Kumamoto Prefecture. It was a large and extremely well fortified castle. The castle keep (tenshukaku) is a concrete reconstruction built in 1960, but several ancillary wooden buildings remain of the original castle. Kumamoto Castle is considered one of the three premier castles in Japan, along with Himeji Castle and Matsumoto Castle. Thirteen structures in the castle complex are designated Important Cultural Property.
The castle was besieged in 1877 during the Satsuma Rebellion, and the castle keep and other parts were burned down. 13 of the buildings in the castle complex were undamaged, and have been designated Important Cultural Properties. In 1960, the castle keep was reconstructed using concrete. From 1998 to 2008, the castle complex underwent restoration work, during which most of the 17th century structures were rebuilt.