| Pen yr Allt Uchaf | |
| Elevation M: | 630 |
| Prominence M: | 60 |
| Parent Peak: | Aran Fawddwy |
| Listing: | Hewitt, Nuttall |
| Translation: | top of the highest slope |
| Language: | Welsh |
| Location: | Gwynedd, Wales |
| Range: | Snowdonia |
| Grid Ref Uk: | SH 86644 19322 |
| Topo: | OS Landranger 124 |
Pen yr Allt Uchaf is a subsidiary summit of Aran Fawddwy in the south of the Snowdonia National Park in Gwynedd, Wales. The summit is the highest point on a ridge branching off to the west of Aran Fawddwy's south ridge.
The summit is marked by a small cairn, and offers bird-eyes views of Cwm Cywarch. Close views of the steep south faces of Glasgwm, Gwaun y Llwyni and Aran Fawddwy are observed.[1]