Killygordon or Killygordan (Irish: Cúil na gCuirridín), is a small village in the Finn Valley of east County Donegal, Ireland. It has a population of 114 (2006) and is located on the N15 between Ballybofey and Castlefin. The separate townland of the Crossroads lies half a mile from Killygordon, however, they are often regarded as one. The River Finn passes by the village on its way towards its confluence with the River Mourne and the River Foyle.

Monellan Castle, situated two miles outside the village, was built during the 18th century, and part of the 35 room dwelling was underground, to be used as a place of safety - if such was required. The castle and its gardens were in proper condition for some time after the Catholic Emancipation Act in 1775, until its demolition in the 1930s - on orders given to the Irish Land Commission from the Government of the day.

The village and surrounding areas have a considerable Protestant population, however, Roman Catholicism is the main religion practiced.