The Afon Ceirig is a small river in Mid Wales.

It flows from Esgair Llewelyn in the middle of the Dyfi Hills down to Mathafarn, north-west of Cemmaes Road, where it joins the Afon Dyfi.

[1] Between 1763 and around 1840 a water corn mill stood on the river at Bryn Melin, north of Mathafarn.

[2]