Llansoy (Welsh: Llan-soe) is a small village in Monmouthshire, south east Wales, United Kingdom, located about 3 miles (4.2 km) south east of Raglan.

There is an Iron Age hillfort 1 mile (1.6 km) northwest of the village, at Great House, covering an area of about 5 acres (2 hectares) and overlooking the Olway Brook.

Later, the area was reputedly settled by descendants of the Welsh king St. Brychan Brycheiniog.

[2][page needed] The tower probably dates from the late 17th century.

[1] The nearest pub, the Star Inn, is located about 1 mile (1.6 km) east of the village in the neighbouring parish of Llanfihangel Tor-y-Mynydd although its location is often given as Llansoy.