| Afon Cerist | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Wales |
| Length Mi: | 4.7 |
| Source1: | Maesglase |
| Source1 Elevation: | 1419feet |
| Mouth Location: | Dinas Mawddwy |
| Mouth Coordinates: | 52.7206°N -3.6876°W |
The Afon Cerist is a small river that flows from underneath Craig Portas, the cliffs on the north side of Maesglase mountain, to meet the River Dyfi at Dinas Mawddwy.[1] It forms the northern border of the Dyfi Hills.