Ōyama (大山町 Ōyama-machi) was a town located in Kaminiikawa District, Toyama, Japan.
On April 1, 2005 Ōyama, along with the towns of Ōsawano, from Kaminiikawa District, the towns of Fuchū and Yatsuo, and the villages of Hosoiri and Yamada, all from Nei District, was merged into the city of Toyama.
As of 2003, the town had an estimated population of 11,686 and a density of 20.42 persons per km². The total area was 572.32 km².