Afon Merddwr is a river in the south of the county of Conwy, Wales. It is a tributary of the River Conwy and joins it near Pentrefoelas. It is about 10 km long. "Merddwr" is Welsh for backwater or stagnant water, suggesting that it was named for its current or water quality.
The source of the river is on the southern slopes of Mwdwl-eithin , the highest hill in Mynydd Hiraethog . Its name for the first part of its course is Afon Llaethog . It flows south before turning west near the small village of Glasfryn.
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