Hirosawa Dam (Japanese: 広沢ダム) is a gravity dam located in Miyazaki Prefecture in Japan.

The catchment area of the dam is 43 square kilometres.

The dam impounds about 35 hectares of land when full and can store 5.1 million cubic metres of water.

The construction of the dam was started on 1974 and completed in 2000.

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