Llandrinio is a small village and community in Montgomeryshire, Powys, Wales, close to the Wales-England border.

It is situated on the B4393 road which travels from the village of Ford, Shropshire to Lake Vyrnwy.

The community, Llandrinio and Arddleen includes Arddlin and a small part of Four Crosses, Powys.

[1] The mainly Norman church of St Trunio is a Grade II* listed building.

The river is crossed by Llandrinio Bridge which leads to the hamlet of Crew Green, about a mile east of the village and close to English border.