Llanishen (Welsh: Llanisien) is a village in Monmouthshire, south east Wales, United Kingdom. It is located 7 miles (11 km) south west of Monmouth and 3 miles (4.8 km) south of Trellech on the B4293 road, although the main part of the village is set immediately to the west of the road, overlooking the Vale of Usk.