| Pumlumon Fach | |
| Elevation M: | 664 |
| Prominence M: | 20 |
| Parent Peak: | Pen Pumlumon Fawr |
| Listing: | Nuttall |
| Language: | Welsh |
| Location: | Ceredigion, Wales |
| Range: | Cambrian Mountains |
| Coordinates: | 52.4708°N -3.7848°W |
| Grid Ref Uk: | SN789869 |
| Topo: | OS Landranger 135 |
Pumlumon Fach is a top of Pen Pumlumon Fawr on the Plynlimon massif, a part of the Cambrian Mountains in the county of Ceredigion, Wales. It lies on small ridge heading north-west from the summit of Pen Pumlumon Fawr.
The summit is marked by small cairn, and overlooks the Nant-y-moch Reservoir to the north and Llyn Llygad Rheidiol to the east. The views also include the smaller summits of Drosgol (550m) and Banc Llechwedd-mawr (560m) and Cwm Hyddgen, a hide out of Owain Glyndŵr and his army.[1]