| Gwaunceste Hill | |
|---|---|
| Bryn Gwaun-cest | |
 | |
| Highest point | |
| Elevation | 542 m (1,778 ft) |
| Prominence | 161 m (528 ft) |
| Parent peak | Great Rhos |
| Listing | Marilyn |
| Coordinates | 52°11′30″N 3°13′58″W / 52.1917°N 3.2329°W |
| Naming | |
| Language of name | Welsh |
| Geography | |
| Location | Powys, Wales |
| OS grid | SO 158555 |
| Topo map | OS Landranger 148 / Explorer 200 |
Gwaunceste Hill (Welsh: Bryn Gwaun-cest) is a 542-metre-high hill in the county of Powys in east Wales. It falls within the communities of Gladestry and Glascwm around 4 km east of the village of Hundred House and about 2 km north of the hamlet of Glascwm. The headwaters of the River Arrow gather on the eastern slopes of the hill. Drainage of its western slopes is into the River Edw, a tributary of the River Wye. Two subsidiary tops to the southeast and southwest are both known as ‘Little Hill’.