| River Cwmnantcol | |
|---|---|
 | |
 | |
| Native name | Afon Cwmnantcol (Welsh) |
The River Cwmnantcol (Afon Cwmnantcol in Welsh) is a river in North Wales.
It is about 3 miles (5 kilometres) long and has its source at the head of Cwm Nantcol below Rhinog Fawr and Y Llethr. It flows north-west from its source and joins the Afon Artro at Pentre Gwynfryn.