Drumardagh (Irish: Droim Ardagh) is a townland in the east of County Donegal in Ulster, Ireland.

The Irish name means 'the Ridge (drum) on the High Place (ardagh)', and it is this elevation that gives Drumardagh its commanding views over Lough Swilly, from Glenswilly to Inch Island, and beyond to the peaks of the Fanad and Inishowen peninsulae.

Due to its elevated location, and the surrounding lowland isles on the banks of Lough Swilly, Drumardagh has a history of military significance.

[2] Drumardagh and surrounding areas of the Laggan district were heavily 'planted' with Lowland Scots settlers during the Plantation of Ulster in the seventeenth century.

These trenches were used by the British as a means of maintaining watch over the nearby shipping channel, which at that time was a busy communications link into and out of central County Donegal.