Ardee is a town and townland in County Louth, Ireland. It is located at the intersection of the N2, N52, and N33 roads. Ardee is on the banks of the River Dee and is approximately 20 km (12 mi) from Dundalk, Drogheda, Slane and Carrickmacross.
Originally called Atherdee, its name is derived from the Irish Áth Fhirdia (the Ford of Ferdia), from the mythological four day battle between Cúchulainn and Ferdia, for the defence of Ulster from Queen Maeve of Connacht. Ferdia fell after four days of battle and is buried on the southern banks of the river alongside the Riverside Walk. Ardee Castle in the town (St. Leger's) is the largest fortified medieval tower house in Ireland.