Doonconor, Archaeological ringfort in Conamara, Ireland.

Doonconor is a circular stone ringfort with an average width of about 50 meters and substantial walls. The structure consists of multiple stacked terraces connected by internal stairs.

Dún Conor is a stone ringfort on Inishmaan whose construction is dated only by inference, since no excavations have taken place; a first-millennium AD origin is assumed. Its central position on the island's highest point spared it the coastal damage suffered by forts such as Dún Aengus. John O'Donovan visited in 1839, and the interior clocháns were restored in the 1880s.

The name means Conor's Fort, referencing a legendary figure from early Irish history. Locals regard this site as an important place of cultural heritage.

The site is best reached on foot, and the terrain requires good shoes due to uneven surfaces and potentially wet conditions. Visitors should allow time to explore the different levels and surrounding landscape.

Two ramps on the outer walls stop about two metres below the wall top, which some archaeologists read as evidence that Dún Chonchúir was a ceremonial site rather than a fortress. In 1873 William O'Malley, called An Máilleach, hid here for some months after killing his father, a story that inspired J. M. Synge's play The Playboy of the Western World.