Alexander McDonnell may refer to:
Ballycastle is a small seaside town in County Antrim, Northern Ireland. It is on the north-easternmost coastal tip of Ireland, in the Antrim Coast and Glens Area of Outstanding Natural Beauty.
Earl of Antrim is a title that has been created twice, both times in the Peerage of Ireland and both times for members of the MacDonnell family, originally of Scottish origins.

Randall MacDonnell, 1st Marquess of Antrim (1609–1683) was a Roman Catholic landed magnate in Scotland and Ireland, son of the 1st Earl of Antrim. He was also chief of Clan MacDonnell of Antrim. He is best known for his involvement, mostly on the Royalist side, in the Wars of the Three Kingdoms.
Randall MacSorley MacDonnell, 1st Earl of Antrim, PC (Ire), rebelled together with Tyrone and Tyrconnell in the Nine Years' War but having succeeded his brother, Sir James mac Sorley MacDonnell, as Lord of the Route and the Glynns in 1601, he submitted to Mountjoy, the Lord Deputy of Ireland, in 1602.
A list of people who have served as Lord-Lieutenant of Antrim, located in Northern Ireland.
Dunluce Castle is a now-ruined medieval castle in Northern Ireland, the seat of Clan MacDonnell. It is located on the edge of a basalt outcropping in County Antrim, and is accessible via a bridge connecting it to the mainland. The castle is surrounded by extremely steep drops on either side, which may have been an important factor to the early Christians and Vikings who were drawn to this place where an early Irish fort once stood.

Clan MacDonald of Dunnyveg, also known as Clan Donald South, Clan Iain Mor, Clan MacDonald of Islay and Kintyre, MacDonalds of the Glens (Antrim) and sometimes referred to as MacDonnells, is a Scottish clan and a branch of Clan Donald. The founder of the MacDonalds of Dunnyveg is Eòin Mòr Tànaiste Mac Dhòmhnaill, a son of Iain Mic Dhòmhnaill and Margaret Stewart of Scotland, daughter of King Robert II. Members of the clan actually pronounced and spelled their name M'Connall due to the Gaelic pronunciation of the name Mac Domhnuill thus giving rise to the surname McConnell and its variants. While historically recognised as a clan by the Court of the Lord Lyon, it is now an armigerous clan as it no longer has a chief. The last chief was Sir James MacDonald, 9th of the Clan MacDonald of Dunnyveg or Clan Donald South, who died in London in 1626.
MacDonnell, Macdonnell, or McDonnell is a surname of Irish and Scottish origin. It is an anglicized form of the Gaelic patronymic Mac Dhòmhnaill, meaning "son of Dòmhnall". The Gaelic personal name Dòmhnall is a Gaelicised form of the name Donald, which is composed of the elements domno, meaning "world", and val, meaning "might" or "rule". The name is considered a variation of MacDonald.
The MacDonnells of Antrim, also known as the MacDonnells of the Glens, are a branch in Ireland of the Scottish-based Clan Donald. Initially part of Clan MacDonald of Dunnyveg, the MacDonnells of Antrim became their own branch in 1558 when Somhairle Buidhe MacDonnell obtained the lordship of the territory in Ireland from James MacDonald, 6th chief of the Clan MacDonald of Dunnyveg.
Glenarm Castle, Glenarm, County Antrim, Northern Ireland, is the ancestral home of the Earl of Antrim.
Randal MacDonnell, 1st Marquess of Antrim may refer to:
Events from the year 1565 in Ireland.
Alexander MacDonnell, 3rd Earl of AntrimPC (Ire) was a Catholic peer and military commander in Ireland. He fought together with his brother Randal on the losing side in the Irish Confederate Wars (1641–1653); and then, having succeeded his brother as the 3rd Earl of Antrim in 1683, fought in the Williamite War (1688–1691), on the losing side again. Twice he forfeited his lands and twice he regained them.
Randal MacDonnell or McDonnell may refer to:
Ballycastle Castle was a castle located at Ballycastle in County Antrim in Northern Ireland.
Alexander MacDonnell may refer to:
Ellis MacDonnell, Countess of Antrim was an Irish aristocrat of the late Elizabethan and early Stuart eras.

Randal John Somerled McDonnell, 8th Earl of Antrim KBE (1911–1977) was a diplomat, activist, soldier and administrator. He became chairman of the National Trust in 1965.
The Hon. Hector John McDonnell is a Northern Irish painter, etcher, and author, specializing in architectural art, landscape, and portrait work.
Randal Alexander McDonnell, 10th Earl of Antrim DL, previously known as Viscount Dunluce, is a Northern Irish landowner, with an estate based at Glenarm Castle, and a City of London businessman, chairman of Sarasin & Partners LLP a subsidiary of J. Safra Sarasin. He is also a Deputy Lieutenant of County Antrim.