Drumlion (Droim Laighean in Irish) is a townland in North Roscommon in the parish of Killukin and the Barony of Boyle. It is within the former Gaelic territory of Magh Luirg, also known as Siol Muireadhaigh. The surrounding countryside is dotted with many historical monuments such as ring forts (ráthanna) and fairy forts (liosanna). Drumlins are a prominent feature of the terrain along with many small streams feeding into the River Shannon.
The name of the townland is associated with the Táin Bó Cúailnge. As Queen Medbh assembled her forces for her invasion of Ulster a group of men coming to join her army from the province of Leinster camped on the highest ridge in the townland. It was from this action that Drumlion received its Irish name, as Droim Laighean translates into the "Ridge of the men of Leinster".
Drumlion has an area of 940,127 m² / 94.01 hectares / 0.9401 km² 0.36 square miles, 232.31 acres / 232 acres, 1 rood, 9 perches. Located in the townland is St.Michaels Church and Drumlion Graveyard. The area is sparsely populated.