Hioki is a city in Kagoshima Prefecture, Japan. As of May 1, 2010, the city had a population of 51,819 and a population density of 205 persons per km². The total area is 253.06 km².
The modern city of Hioki was established on May 1, 2005, from the merger of the towns of Fukiage, Higashiichiki, Hiyoshi and Ijūin.