| Gorllwyn | |
| Elevation M: | 613 |
| Prominence M: | 88 |
| Parent Peak: | Drygarn Fawr |
| Listing: | Hewitt, Nuttall |
| Language: | Welsh |
| Location: | Powys, Wales |
| Range: | Cambrian Mountains |
| Grid Ref Uk: | SN862584 |
| Topo: | OS Landranger 147 |
Gorllwyn is a subsidiary summit of Drygarn Fawr, located on a remote moorland plateau of the Cambrian Mountains. The summit is grassy and is surrounded by peat bog. There is a shelter cairn and a trig point.
To the west is Drygarn Fawr, its large cairns making it a very distinctive feature in an otherwise featureless plateau. Drygarn Fawr is separated from Gorllwyn by the pass of Bwlch y Ddau Faen. To the east the plateau continues towards Y Gamriw.[1] Radnor Forest lies further to the east.