| Ohso Dam | |
| Name Official: | 大蘇ダム |
| Location: | Kumamoto Prefecture, Japan |
| Dam Length: | 262.1m |
| Dam Height: | 69.9m |
| Construction Began: | 1975 |
| Opening: | 2019 |
| Res Capacity Total: | 4300 thousand cubic meters |
| Res Catchment: | 26 sq. km |
| Res Surface: | 28 hectares |
| Coordinates: | 32.995°N 131.2011°W |
| Location Map: | Japan |
Ohso Dam is a rockfill dam located in Kumamoto Prefecture in Japan. The dam is used for irrigation. The catchment area of the dam is 26 km2. The dam impounds about 28 ha of land when full and can store 4300 thousand cubic meters of water. The construction of the dam was started on 1975 and completed in 2019.[1]