Denbigh Castle (Welsh: Castell Dinbych) was a fortress built following the 13th-century conquest of Wales by Edward I.
The castle, which stands on a rocky promontory above the Welsh market town of Denbigh, Denbighshire, was built upon an earlier Welsh stronghold. It was defended by a unique triple-towered gateway.
A planned town (bastide) was laid out at the same time as the castle. The Anglo-Norman borough was an attempt by Edward I to pacify the Welsh.