Deganwy Castle is a ruined fortress at Deganwy, at the mouth of the River Conwy in north Wales. It sits on a volcanic plug about 361 feet (110 m) high. The site was probably occupied in the Roman period, and tradition links it to King Maelgwn Gwynedd, though this is uncertain. Robert of Rhuddlan likely built a castle here, possibly from 1073.
In the 13th century Llywelyn ab Iorwerth fortified the site and rebuilt it in stone. His son Dafydd ap Llywelyn destroyed it in 1241 ahead of an English advance. Henry III then rebuilt it extensively at a cost of over £2,200, but Llywelyn ap Gruffudd destroyed it again in 1263.
Edward I built Conwy Castle across the estuary in 1283 and left Deganwy in ruins. Only ditches and mounds survive. Leslie Alcock excavated the site from 1961 to 1966.
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