was a town located in Hita District, Ōita Prefecture, Japan.
As of 2003, the town had an estimated population of 3,729 and the density of . The total area was .
On March 22, 2005, Ōyama, along with the town of Amagase, and the villages of Kamitsue, Maetsue and Nakatsue (all from Hita District), was merged into the expanded city of Hita.[1]