| Jōzankei Dam | |
| Dam Crosses: | Otarunai River |
| Location: | Sapporo, Hokkaidō, Japan |
| Dam Length: | 410 m |
| Dam Height: | 118 m |
| Construction Began: | 1974 |
| Opening: | 1989 |
| Res Capacity Total: | 82,300,000 m3 |
| Res Catchment: | 104 km2 |
| Res Surface: | 230 hectares |
| Coordinates: | 42.9847°N 141.1575°W |
is a concrete Gravity dam in Sapporo, Hokkaidō, Japan situated upon the Otaru River. It supports a 120 MW hydroelectric power station.[1]