Llantrisant is a village in Monmouthshire, Wales. Llantrisant lies south of Llanllywel, Gaerllwyd is to the east of the village, Llandegreth to the south west and Usk to the north west.

The remains of Castell Troggy, a Norman stone castle is sited close by on the Wentwood hillside. The village also has a church which is dedicated to Saints Peter, Paul and John .....the three saints after whom the village is named. (Llan – Church; Tri – Three; Sants – Saints).

The long distance footpath, the Usk Valley Walk passes through the village after descending from the Wentwood escarpment.

The village lies on the banks of the River Usk, which rises on the northern slopes of the Black Mountain in Powys, Wales. The River Usk tumbles for most of its upper and middle reaches through the beautiful Brecon Beacons National Park. After passing through the market town of Brecon and the pretty little town of Crickhowell, the river runs through the Usk Valley before leaving the National Park at Abergavenny and meandering through the farmland of the broader valley around Llantrisant