| Glen Fernaigh River | |
| Name Other: | Glen Fernaigh Creek |
| Subdivision Type1: | Country |
| Subdivision Name1: | Australia |
| Subdivision Type2: | State |
| Subdivision Name2: | New South Wales |
| Subdivision Type3: | Region |
| Subdivision Name3: | NSW North Coast (IBRA), Northern Rivers |
| Subdivision Type5: | Municipality |
| Subdivision Name5: | Clarence Valley |
| Source1: | Dorrigo Plateau, Great Dividing Range |
| Source1 Location: | near Hernani, west of Dorrigo |
| Source1 Elevation: | 1224m (4,016feet) |
| Mouth: | confluence with the Nymboida River |
| Mouth Location: | near Tyringham, northwest of Dorrigo |
| River System: | Clarence River catchment |
Glen Fernaigh River, a perennial river of the Clarence River catchment, is located in the Northern Rivers region of New South Wales, Australia.
Glen Fernaigh River rises on the Dorrigo Plateau within the Great Dividing Range near Hernani, west of Dorrigo, and flows generally northeast then east before reaching its confluence with the Nymboida River near Tyringham, northwest of Dorrigo.