Kaiyō is a town located in Kaifu District, Tokushima Prefecture, Japan. As of 1 May 2022, the town had an estimated population of 8,699 in 4488 households and a population density of 27 persons per km². The total area of the town is 327.65 square kilometres (126.51 sq mi).

Tokushima Prefecture is a prefecture of Japan located on the island of Shikoku. Tokushima Prefecture has a population of 728,633 and has a geographic area of 4,146 km2. Tokushima Prefecture borders Kagawa Prefecture to the north, Ehime Prefecture to the west, and Kōchi Prefecture to the southwest.