Kan'onji is a city located in Kagawa Prefecture, Japan. As of 1 October 2022, the city had an estimated population of 57,921 in 25510 households and a population density of 490 persons per km². The total area of the city is 117.84 square kilometres (45.50 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.