Tsu Castle (津城 Tsu-jō) was a Japanese castle located in Tsu, Mie Prefecture, Japan. During the Edo period, Tsu Castle was home to the Sudo clan, daimyō of Tsu Domain, who dominated the provinces of Ise and Iga. The castle was also known as "Anotsu-jō" (安濃津城?) after the ancient name for Tsu. The castle ruins are a Prefectural Historic Site.