The River Crafnant (Afon Crafnant in Welsh) is a tributary of the River Conwy (Afon Conwy in Welsh), which is the main river of the Conwy valley in North Wales.
It flows from Llyn Crafnant, joining the River Conwy at Trefriw. It is about 2.5 miles in length.
The river Crafnant itself has a tributary, the river Geirionydd which flows from Llyn Geirionydd. These two join a little below the former Klondyke Mill, which used water from both rivers. Klondyke was a mining and milling complex connected with some of the metal mines of the Gwydir Forest.
At Trefriw water is extracted to pass through the woollen mill to generate hydro-electricity for the mill.