| Tretower Castle | |
|---|---|
| Tretower, Powys, Wales | |
 Tretower Castle | |
  Tretower Castle | |
| Coordinates | 51°53′02″N 3°11′10″W / 51.8839°N 3.1861°W |
| Site information | |
| Owner | Cadw |
| Condition | Ruined |
Listed Building – Grade I | |
Tretower Castle (Welsh: Castell Tretŵr) is a Grade I-listed ruined castle in the village of Tretower in the county of Powys, Wales. It was built around the beginning of the twelfth century as a motte and bailey castle and this was probably replaced mid-century by a stone shell keep. The castle was enlarged in the early thirteenth century, but later fell into ruin.