Llanarth Court is a late-18th-century country house with substantial 19th-century alterations in Llanarth, Monmouthshire, Wales. The court was built for the Jones family of Treowen and was subsequently the home of Ivor Herbert, 1st Baron Treowen, whose family still owns much of the Llanarth estate, although not the court itself. The court is a Grade II* listed building and is now a private hospital. The gardens are included on the Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales.

Llanarth is a privately owned estate village and community within a conservation area in the Welsh county of Monmouthshire. Llanarth is roughly six miles (10 km) east of Abergavenny and four miles (6 km) west of Raglan.