Mashiki is a town located in Kamimashiki District, Kumamoto Prefecture, Japan. As of January 2024, the town has an estimated population of 34,085 and a density of 520 persons per km2. The total area is 65.67 km2.

Kumamoto Prefecture is a prefecture of Japan located on the island of Kyūshū. Kumamoto Prefecture has a population of 1,748,134 and has a geographic area of 7,409 square kilometres (2,861 sq mi). Kumamoto Prefecture borders Fukuoka Prefecture to the north, Ōita Prefecture to the northeast, Miyazaki Prefecture to the southeast, and Kagoshima Prefecture to the south.