was a town located in Sera District, Hiroshima Prefecture, Japan.

As of 2003, the town had an estimated population of 6,732 and a density of 67.46 persons per km<sup>2</sup>. The total area was 99.79 km<sup>2</sup>.

On October 1, 2004, Kōzan, along with the town of Seranishi (also from Sera District), was merged into the expanded town of Sera and no longer exists as an independent municipality.

  • Official website of Sera