Miyakonojō is a city in Miyazaki Prefecture, Japan. As of 1 November 2023, the city had an estimated population of 158,235 in 72394 households, and a population density of 240 persons per km2. The total area of the city is 653.36 km2 (252.26 sq mi), making it the largest city in the prefecture in terms of area.

Miyazaki Prefecture is a prefecture of Japan located on the island of Kyūshū. Miyazaki Prefecture has a population of 1,073,054 as of 1 June 2019 and has a geographic area of 7,735 km2. Miyazaki Prefecture borders Ōita Prefecture to the north, Kumamoto Prefecture to the northwest, and Kagoshima Prefecture to the southwest.