The River Rhaeadr (Welsh: Afon Rhaeadr) is a river in Wales.

It starts at the Pistyll Rhaeadr waterfall (known in English as Aber Falls), a few miles from the village of Llanrhaeadr-ym-Mochnant, where the Afon Disgynfa falls over a 240-foot (75 m) cliff-face, after which the river is known as the Afon Rhaeadr.

Downstream, the Afon Rhaeadr runs into the Afon Tanat .

See also

• River Wye (Afon Gwy )