Sō (曽於郡; -gun) is a district located in Kagoshima, Japan.
As of 2003, the district has an estimated population of 98,902 and the density of 113.73 persons per km². The total area is 869.63 km².
Towns and villages Ariake Kihoku Matsuyama Oosaki Oosumi Shibushi Sueyoshi Takarabe