Zentsūji is a city located in Kagawa Prefecture, Japan. As of 1 October 2022, the city had an estimated population of 30,780 in 13096 households and a population density of 770 persons per km2. The total area of the city is 39.93 square kilometres (15.42 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.