Hoshiyama Dam (Japanese: 星山ダム) is a gravity dam located in Miyazaki Prefecture in Japan.

The dam is used for power production.

The dam impounds about 33 ha of land when full and can store 1731 thousand cubic meters of water.

The construction of the dam was started on 1939 and completed in 1942.

This article about a dam or floodgate on Kyushu, Japan is a stub.