Oyama is a town located in Suntō District, Shizuoka Prefecture, Japan. As of 1 October 2023, the town had an estimated population of 17,297 in 7496 households and a population density of 127 persons per km2. The total area of the town is 135.74 square kilometres (52.41 sq mi).

Shizuoka Prefecture is a prefecture of Japan located in the Chūbu region of Honshu. As of September 2023, Shizuoka Prefecture has a population of 3,555,818 and has a geographic area of 7,777.42 km2 (3,002.88 sq mi). Shizuoka Prefecture borders Kanagawa Prefecture to the east, Yamanashi Prefecture to the northeast, Nagano Prefecture to the north, and Aichi Prefecture to the west.