Minamiaso is a village in Aso District, Kumamoto Prefecture, Japan.
It was formed on February 13, 2005 from the merger of the villages of Chōyō, Hakusui and Kugino. Neighbouring towns are Takamori, Ōzu, and Nishihara.
As of April 30, 2019, the village has an estimated population of 10,535 and a population density of 77 persons per km². The total area is 137.30 km².