thumb|250px|Location of Kamimashiki District in Kumamoto Prefecture
is a district located in Kumamoto Prefecture, Japan.
As of the Yamato merger (but with 2003 population statistics), the district had an estimated population of 90,315 and a density of 115.2 persons per square kilometer. The total area is 784.03 km<sup>2</sup>.
Towns and villages
- Kashima
- Kōsa
- Mashiki
- Mifune
- Yamato
Mergers
- On February 11, 2005, the municipalities of Yabe and Seiwa merged with the town of Soyō from Aso District to form the new town of Yamato.