Kilmacrennan (Gaelic: Cill Mhic nÉanáin or Cill Mhic Réanáin) is a small village in County Donegal, Ireland. The village had a population of 685 in the 2011 census, however the village's population has increased steadily over the last decade with many new housing developments catering, in particular, for overspill population from Letterkenny. Kilmacrennan was historically the caput of its eponymous Barony of Kilmacrennan, of the eight Baronies of Donegal. The Battle of Kilmacrennan was fought near the village in 1608 during O'Doherty's Rebellion.