| Pen y Castell | |
| Elevation M: | 623 |
| Prominence M: | 29 |
| Listing: | sub Hewitt, Nuttall |
| Language: | Welsh |
| Location: | Conwy, Wales |
| Range: | Snowdonia |
| Grid Ref Uk: | SH708695 |
Pen y Castell is a summit in the Carneddau mountains in north Wales. It tops the east ridge of Drum (Wales). The summit consists of rocky outcrops amid a small boggy plateau. Views of the higher Carneddau ridge to the west, Craig Eigiau to the south, Tal y Fan to the north and the Conwy valley to the east can be seen.[1]