Ōzu is a Japanese city located in Nanyo, the region occupying the southern half of Ehime Prefecture. As of 31 August 2022, the city had an estimated population of 40,723 in 19688 households and a population density of 94 persons per km².The total area of the city is 432.22 square kilometres (166.88 sq mi).

Ehime Prefecture is a prefecture of Japan located on the island of Shikoku. Ehime Prefecture has a population of 1,334,841 and has a geographic area of 5,676 km2. Ehime Prefecture borders Kagawa Prefecture to the northeast, Tokushima Prefecture to the east, and Kōchi Prefecture to the southeast.