| Xonxa Dam | |
| Name Official: | Xonxa Dam |
| Dam Crosses: | White Kei |
| Res Name: | Xonxa Dam Reservoir |
| Location: | Eastern Cape, South Africa |
| Operator: | Department of Water and Sanitation |
| Dam Length: | 320 m |
| Dam Height: | 48 m |
| Dam Type: | composite zoned earthfill/rockfill |
| Opening: | 1972 |
| Res Capacity Total: | 158 500 000 m3 |
| Res Catchment: | 1 486 km2 |
| Res Surface: | 1 450 ha |
| Coordinates: | -31.8212°N 27.1318°W |
Xonxa Dam, is a composite zoned earthfill/rockfill dam situated on the White Kei River in Eastern Cape, South Africa. It was established in 1972 and has a capacity of . The wall is high. The dam serves mainly for irrigation purposes and its hazard potential has been ranked high (3).