Slievardagh (Irish: Sliabh Ardach) is a barony in County Tipperary, Ireland. This geographical unit of land is one of 12 baronies in County Tipperary. Its chief town is Mullinahone. The barony lies between Eliogarty to the north (whose chief town is Thurles), Iffa and Offa East to the south (whose chief town is Clonmel) and Middle Third to the west (whose chief town is Cashel). It is currently administered by Tipperary County Council.