Tsu Castle in Mie Prefecture, Japan, was originally built in 1558 by Hosono Fujiatsu and later expanded by Oda Nobukane, the younger brother of Oda Nobunaga. The castle was strategically located between the Ano and Iwata Rivers, which formed natural moats, and served as a key stronghold for the Oda clan's control over the Ise region.

In 1600, during the Battle of Sekigahara, the castle was attacked and largely destroyed by opposing forces but rebuilt and expanded under the skilled castle architect Tōdō Takatora. The castle featured multiple baileys, stone walls, moats, and yagura watchtowers, although the main keep was lost to fire in 1662 and never rebuilt.

The castle grounds eventually became a city park, with remnants like stone walls, moats, and a reconstructed turret marking its historical significance. Tsu Castle is recognized as one of Japan’s top 100 castles.