Ballyshannon Castle
Ballyshannon Castle was a castle at Ballyshannon, County Donegal, Ireland. The castle was a stronghold of the O’Donnell clan. No visual remains of the castle exist above ground.
The castles
Burt Castle
Burt Castle is a ruined castle located close to Newtowncunningham and Burt, two villages in the east of County Donegal in Ulster, Ireland. Historically it was sometimes spelt as Birt Castle. It is also known by the name O'Doherty's Castle, and should not be mistaken for O'Doherty's Keep near Buncrana.
Carrickabraghy Castle
Carrickabraghy Castle (Irish: Caisleán Charraig Bhrachaí stands in the townland of Carrickabraghy meaning "Friars Rock" in Irish) on a rocky outcrop at the north-western extremity of the Isle of Doagh, at the head of Pollan Bay, in the north of Inishowen, a peninsula on the north coast of County Donegal, Ireland.
Doe Castle
Doe Castle, or Caisleán na dTuath, near Creeslough, County Donegal, was the historical stronghold of Clan tSuibhne (Clan McSweeney), with architectural parallels to the Scottish tower house. Built in the early 15th century, it is one of the better fortalices in the north-west of Ireland.
Donegal Castle
Donegal Castle (Irish: Caisleán Dhún na nGall) is a castle situated in the centre of Donegal Town in County Donegal in Ulster, the northern province in Ireland. The castle was the stronghold of the O'Donnell clan, Lords of Tír Conaill and one of the most powerful Gaelic families in Ireland from the 5th to the 16th centuries.
Drumboe Castle
Drumboe Castle was located on the outskirts of the town of Stranorlar in County Donegal, Ireland.
Glenveagh Castle
Glenveagh Castle (Irish: Caisleán Ghleann Bheatha) is a large castellated mansion located in Glenveagh National Park, County Donegal, Ireland and was built in about 1870.
Inch Castle
Inch Castle is a ruined castle located on the southern tip of Inch Island in County Donegal in Ulster, the northern province in Ireland. The castle was constructed around 1430 by the Gaelic Irish lord Neachtain O'Donnell for his father-in-law, Cahir O'Doherty.
Mongavlin Castle
Mongavlin Castle, also known as Mongevlin Castle, is a ruined castle on the west bank of the River Foyle, approx 3 km south of St Johnston, a village in the east of County Donegal in Ulster, the northern province in Ireland. Mongavlin was once a stronghold of the O'Donnells, Lords of Tyrconnell.
Rahan Castle
Rahan Castle, also known as McSwyne's Castle and Castle Murray, is a ruined castle near Dunkineely, County Donegal, Ireland. The castle was once a stronghold of Clan Suibhne.
Raphoe Castle
Raphoe Castle, also known as the Bishop's Palace, is a ruined early 17th-century castle on the edge of Raphoe, County Donegal, Ireland. The 'castle' was built in the 1630s for The Rt. Rev. Dr John Leslie, Church of Ireland Lord Bishop of Raphoe, from stone from a ruined round tower.
Descriptions are Wikipedia's own opening lines, used under CC BY-SA 4.0 with a link to each article; the list and the coordinates come from the same place. Nothing here is a guide to access — many of these are private homes or stand in private fields.
Older than the castles
What stood in Donegal before anybody thought of building a keep.