Basingwerk Abbey (Welsh: Abaty Dinas Basing) is a Grade I listed ruined abbey near Holywell, Flintshire, Wales. The abbey, which was founded in the 12th century, belonged to the Order of Cistercians. It maintained significant lands in the English county of Derbyshire. The abbey was abandoned and its assets sold following the Dissolution of the Monasteries in 1536.
The abbey had significant lands in the English county of Derbyshire. Henry II gave the monks a manor near Glossop. The Monks' Road and the Abbot's Chair near the town are a reminder of the Abbey's efforts to administer their possession. In 1290 the Abbey gained a market charter for Glossop. The monks also got another charter for nearby Charlesworth in 1328.
By the 13th century, the abbey was under the patronage of Llywelyn the Great, Prince of Gwynedd. His son Dafydd ap Llywelyn gave St Winefride's Well to the abbey. The monks harnessed the power of the Holywell stream to run a corn mill and to treat the wool from their sheep. In 1433, the monks leased all of Glossopdale in Derbyshire to the Talbot family, the future Earls of Shrewsbury (1442).
A legend says a 12th-century Basingwerk Abbey monk was lured into a nearby wood by the singing of a nightingale. He thought he had only been listening a short while, but when he returned, the abbey was in ruins. He crumbled to dust shortly afterwards.
Two centuries earlier a Welsh seer, Robin Ddu ("Robin the Dark"), said the roof on the refectory would go to a church under Moel Famau. It did: when the abbey was sold, the parts of the roof went to St Mary's Church in Cilcain below the slopes of Moel Famau. Another section of roof was reportedly given to the Collegiate and Parochial Church of St Peter at Ruthin, where it still covers the North Nave. Its Jesse window went to the Church of St Dyfnog at Llanrhaeadr-yng-Nghinmeirch.