Tosayama (土佐山村; -mura) was a village located in Tosa District, Kochi, Japan.
On January 1, 2005 Tosayama, along with the village of Kagami, also from Tosa District, was merged into the expanded city of Kōchi and no longer exists as an independent municipality.
As of 2003, the village had an estimated population of 1,251 and a density of 21.12 persons per km². The total area was 59.22 km².