Mitoyo is a city located in Kagawa Prefecture, Japan. As of 31 September 2022, the city had an estimated population of 59,876 in 23024 households and a population density of 270 persons per km2. The total area of the city is 222.73 square kilometres (86.00 sq mi).

Kagawa Prefecture is a prefecture of Japan located on the island of Shikoku. Kagawa Prefecture has a population of 949,358 and is the smallest prefecture by geographic area at 1,877 square kilometres (725 sq mi). Kagawa Prefecture borders Ehime Prefecture to the southwest and Tokushima Prefecture to the south.