Komatsushima is a city located in Tokushima Prefecture, Japan. As of 30 June 2022, the city had an estimated population of 36,128 in 17181 households and a population density of 800 persons per km². The total area of the city is 45.37 square kilometres (17.52 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.