Dangan Castle is a former stately home in County Meath, Ireland, which is now in a state of ruin. It is situated by Dangan Church on the Trim Road. The castle is the former seat of the Wesley (Wellesley) family and is located outside the village of Summerhill. It was the childhood home of Field Marshal Arthur Wellesley, 1st Duke of Wellington.

Garret Colley Wesley, 1st Earl of Mornington was an Anglo-Irish politician and composer, as well as the father of several distinguished military commanders and politicians of Great Britain and Ireland.