The River Rhaeadr (Welsh: 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.

• River Wye (Afon Gwy)

• Photos of the River Rhaeadr on geograph.org.uk

52°49′00″N 3°17′25″W / 52.81656°N 3.29032°W / 52.81656; -3.29032