| River Rhaeadr | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Wales |
| Source1: | Pistyll Rhaeadr |
| Mouth Location: | Afon Tanat |
The River Rhaeadr (cy|Afon Rhaeadr) is a river in Wales.
It starts at the Pistyll Rhaeadr waterfall a few miles from the village of Llanrhaeadr-ym-Mochnant, where the Afon Disgynfa falls over a 240-foot (73 m) cliff-face, after which the river is known as the Afon Rhaeadr.
Downstream, the Afon Rhaeadr runs into the Afon Tanat.