Llanishen (Welsh: Llanisien) is a village in Monmouthshire, southeast Wales, United Kingdom.

It is located 7 miles (11 km) southwest 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.

The village takes its name from the original dedication of the parish church to St. Isan or Issien, who was said to have been a follower of the 6th century Celtic St. Illtyd.

[2] Pant-glas Farmhouse and its barn are situated to the north of the church, and both have Grade II* listed building status.

Llanishen has a public house, the Carpenter's Arms, which was dates from 1700.