The Sack of Cashel, also known as the massacre of Cashel, was a notorious atrocity which occurred in the Irish County of Tipperary on 15 September 1647, during the Irish Confederate Wars, part of the Wars of the Three Kingdoms. The town of Cashel was held by the Irish Catholic Confederate's Munster army and was besieged and taken by an English Protestant Parliamentarian army under Murrough O'Brien the Baron of Inchiquin. The attack and subsequent sack of Cashel was one of the more brutal incidents of the wars of the 1640s in Ireland.