Yamaguchi Dam is an earthfill dam located in Fukuoka Prefecture in Japan.

The dam is used for irrigation and water supply.

The dam impounds about 10 ha of land when full and can store 800 thousand cubic meters of water.

The construction of the dam was started on 1970 and completed in 1996.

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