Castell Dinas Brân is a medieval castle occupying a prominent hilltop site above the town of Llangollen in Denbighshire, Wales. The presently visible castle was probably built in the 1260s by Gruffydd Maelor II, a Prince of Powys Fadog, on the site of several earlier structures, including an Iron Age hillfort.
Dinas Brân has been variously translated as the "crow's fortress" or "fortress of Bran", with Bran as the name of an individual or of a nearby stream. An English name, "Crow Castle", has also been used since at least the 18th century.