Ardagh (Irish: Ardachadh, meaning 'high field') is a townland in the fertiledistrict known as the Laggan in East Donegal, part of County Donegal, Ireland. It is very near St Johnston. It became part of the large Abercorn Estate and was settled by mainly Lowland Scots settlers during the Plantation of Ulster.

• John Toland, Irish philosopher

• List of towns and villages in Ireland

• Ardagh Townland, Co. Donegal at townlands.ie

55°17′18″N 7°23′29″W / 55.28833°N 7.39139°W / 55.28833; -7.39139