Coordinates: 53°58′08″N 8°12′18″W / 53.968905°N 8.20492°W
Ardcarn or Ardcarne (Irish: Árd-Carna, Árd-charna), is a civil parish in County Roscommon, Ireland.
The name Irish: Árd-Carna "Ardcarn" is derived from Old Irish. Irish: 'Árd' means "height" or "high" (as in "of land"). Irish: 'Carn' broadly refers to natural phenomenon such as a "hill", "mound", "natural stone pile", but also artificial features such as "stone piles", sepulchral monuments, and Megalithic tombs.
The townland of Ardcarn, lies 91 metres above sea level. The Mound and Ringfort on this townland are national monuments in Country Roscommon.
A Topographical Dictionary of Ireland (1840) describes Ardcarn thus:
ARDCARNE, a parish, in the barony of Boyle, County Roscommon, province of Connaught, 3½ miles (E.S.E.) from Boyle, on the road to Carrick-on-Shannon ; containing 7673 inhabitants.