| Afon Ceirig | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Wales |
| Source1: | Esgair Llewelyn |
| Source1 Elevation: | 600feet |
| Mouth Location: | Mathafarn |
| Mouth Coordinates: | 52.6222°N -3.7631°W |
| Mouth Elevation: | 80feet |
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]