Shillelagh is a village located in County Wicklow, Ireland.
The town was planned as part of the FitzWilliam estate in the 17th century. Nearby Coolattin House (designed by John Carr and built around 1800) was the seat of the Fitzwilliam Estate. Tomnafinnoge Oak Wood is the largest remaining oak forest in Ireland. One of only two Cork Oaks in Ireland exists in Shillelagh.