Toba Castle was a Japanese castle located in the city of Toba, Mie Prefecture, Japan. Throughout the Edo period, Toba Castle was the administrative center for Toba Domain, a feudal domain of Shima Province under the Tokugawa shogunate. Toba Castle was also known as the Floating Castle of Toba or the Two-color Castle . The castle site received protection as a Mie Prefectural Historic Site in 1965.

Toba is a city located in Mie Prefecture, Japan. As of 31 July 2021, the city had an estimated population of 17,741 in 8328 households and a population density of 170 persons per km2. The total area of the city is 107.34 square kilometres (41.44 sq mi).