Kagawa Prefecture (香川県, Kagawa-ken) is a prefecture of Japan located on the island of Shikoku. Kagawa Prefecture has a population of 949,358 (as of 2020) 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.
Takamatsu is the capital and largest city of Kagawa Prefecture, with other major cities including Marugame, Mitoyo, and Kan'onji. Kagawa Prefecture is located on the Seto Inland Sea across from Okayama Prefecture on the island of Honshu, which is connected by the Great Seto Bridge. Kagawa Prefecture includes Shōdoshima, the second-largest island in the Seto Inland Sea, and the prefecture's southern land border with Tokushima Prefecture is formed by the Sanuki Mountains.