| Ewenny River | |
|---|---|
 The river at Ewenny, the village to which it gave its name. | |
 | |
| Native name | Afon Ewenni (Welsh) |
| Location | |
| Country | United Kingdom, Wales |
| Region | South Wales |
| County | Vale of Glamorgan |
| Cities | Pencoed, Ewenny, Ogmore |
| Physical characteristics | |
| Source | |
| • location | North of Pencoed, Bridgend County Borough, Bridgend, Wales |
| Length | 11.0 km (6.8 mi) |
| Discharge | |
| • location | Ogmore Castle, Vale of Glamorgan |
| Basin features | |
| Tributaries | |
| • left | Afon Alun, Afon Ewenni Fach, Nant Canna, Nant Crymlyn |
The Ewenny River (Welsh: Afon Ewenni) is a river in South Wales. For most of its 10 miles (16 km) length, it forms the border between the Vale of Glamorgan and Bridgend. It is a major tributary of the River Ogmore, which it joins near its estuary.