Ninosawa Dam (Japanese: 二の沢ダム) is an earthfill dam located in Hokkaido Prefecture in Japan. The dam is used for irrigation. The catchment area of the dam is 0.9 km. The dam impounds about 5 ha of land when full and can store 304 thousand cubic meters of water. The construction of the dam was started on 1923 and completed in 1925.