St Eunan's College (/ˈjuːnən/ YOO-nən; Irish: Coláiste Adhamhnáin), known locally as The College to distinguish it from the cathedral and GAA club, is a voluntary Roman Catholic all-male secondary day school (and former boarding school) in County Donegal, Ireland. It is located upon Sentry Hill in Letterkenny. Named after Adomnán or Eunan (the Abbot of Iona who was native to Tír Chonaill, mainly modern County Donegal, and is patron saint of the Roman Catholic Diocese of Raphoe), the school's foundation stone was laid on the patron saint's feast day of 23 September.