Dunmanway Castle (Irish: Dún Mánmhaí) was a late 15th century tower house that once stood on the north bank of the Sally (Saileach) River in the town of Dunmanway. It was the chief residence of the MacCarthys of Gleannacroim, before being forfeited in the late-17th century and granted to Cromwellian Lt-Colonel William Arnopp. Some speculation exists around the demolition of the building after it was sold to the Cox family in 1692 with lore suggesting the stone was used for the erection of a flour-mill.