Koganebashi Dam (Japanese: 古賀根橋ダム) is a gravity dam located in Miyazaki Prefecture in Japan.

The dam is used for irrigation and power production.

The dam impounds about 12 ha of land when full and can store 1381 thousand cubic meters of water.

The construction of the dam was started on 1953 and completed in 1958.

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