Nagayoshi Dam (Japanese: 永吉ダム) is a rockfill dam located in Hioki, Kagoshima Prefecture in Japan.

The dam is used for flood control and irrigation.

The dam impounds about 9 ha of land when full and can store 1174 thousand cubic meters of water.

The construction of the dam was started in 1970 and completed in 1979.

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