Killeenduff (Irish: An Cillín Dubh, meaning "small black church") is a townland within the boundaries of the Roman Catholic parish of Easky, County Sligo in Ireland. Located about a mile from the village of Easky, it is home to The Split Rock. Local legend holds that this rock—though actually carried to its current location by an Ice Age glacier—was split as a result of an argument between two giants and that if one walks through the split three times it will close, entombing the person forever! The townland is also home to Killeenduff National School.
The writer Jack Harte (Irish writer) was born at Forge's Corner in Killeenduff, where his father was the local blacksmith. He drew on his experience living there, and ultimately having to leave for the Midlands as his father searched for work, in his novels In the Wake of the Bagger and Reflections in a Tar Barrel. Harte also draws on Killeenduff and its local mythology in many of his short stories.
The sculptor Fred Conlon was also born and grew up in Killeenduff.
Coordinates: 54°17′N 8°56′W / 54.283°N 8.933°W