Dungarvan Castle is a significant historical site located in the town of Dungarvan, County Waterford, Ireland. The castle dates back to the early days of the Anglo-Norman settlement in Ireland, having been built around 1209 to safeguard the entrance to Dungarvan Harbour.

The castle features a polygonal shell keep, which is a rare building type in Ireland and is considered the earliest structure on the site. The castle also has an enclosing curtain wall, a corner tower, and a gate tower. The design of the castle reflects the military architecture of the time, with features such as arrow loops, murder holes, and battlements.

Throughout its history, Dungarvan Castle played a crucial role in the defense of the area. It was used by the British Army and the Royal Irish Constabulary until 1922. However, during the Irish Civil War, the castle was destroyed by the Anti-Treaty IRA.

Despite its destruction, Dungarvan Castle was subsequently refurbished and served as the headquarters of the local Garda Síochana. Today, the barracks and castle grounds are open to visitors. Inside the castle, visitors can explore a revealing exhibition on its long and intriguing history, which includes its role in the Anglo-Norman settlement, its use as a military fortification, and its destruction during the Irish Civil War.

Dungarvan Castle remains an important cultural and historical landmark in Ireland, attracting visitors from all over the world who come to explore its rich heritage and learn about its important role in Ireland's past.