Craig-y-nos Castle (English: Rock of the Night), is a Scottish Baronial country house near Glyntawe in Powys, Wales. Built on parkland beside the River Tawe in the upper Swansea Valley, it is located on the southeastern edge of the Black Mountain. The castle, formerly owned by opera singer Adelina Patti, is now a hotel. Its landscaped grounds are now a country park, managed by the Brecon Beacons National Park Authority. The castle is a Grade II* listed building and its theatre has a separate Grade I listing.