| Llwyn Bryn-Dinas | |
| Map Type: | Wales Powys |
| Map Size: | 180px |
| Coordinates: | 52.8139°N -3.2292°W |
| Gbgridref: | SJ 172 247 |
Llwyn Bryn-Dinas is an Iron Age hillfort on the north side of the Tanat valley, about 1miles west of the village of Llangedwyn, in Powys, Wales.
The hillfort has a single rampart, about 264m (866feet) north to south and 204m (669feet) east to west, following the contours of a prominent hill. The area is about . There is a simple inturned entrance on the south-east.[1]
There was excavation in 1983. It was found that the site was first occupied in the late Bronze Age, about the 10th–9th century BC; the defences were enlarged about the 4th–3rd century BC, during the Iron Age. Built into the rear of the rampart was an Iron Age smithy, for bronze-casting and iron-working, probably to serve the requirements of the settlement.[2]