Fujioka is a city located in Gunma Prefecture, Japan. As of 1 August 2020, the city had an estimated population of 64,539 in 27,616 households, and a population density of 360 persons per km². The total area of the city is 180.29 square kilometres (69.61 sq mi).

Gunma Prefecture is a landlocked prefecture of Japan located in the Kantō region of Honshu. Gunma Prefecture has a population of 1,937,626 and has a geographic area of 6,362 km2. Gunma Prefecture borders Niigata Prefecture and Fukushima Prefecture to the north, Nagano Prefecture to the southwest, Saitama Prefecture to the south, and Tochigi Prefecture to the east.