Cionn Caslach or Ceann Caslach (anglicised as Kincasslagh) is a small Gaeltacht seaside village in the Rosses area of County Donegal, Ireland. Despite only having a population of just over 40 people, the village has attracted much international attention due to the success of local singer Daniel O'Donnell.
The Irish and official name for Kincasslagh is Cionn Caslach or Ceann Caslach, which means head of the small inlet. Due to its status as a Gaeltacht village, all roadsigns to and in the village itself are in the Irish language.
Kincasslagh is in the Gaeltacht region which means the official language of the area is Irish. However, the use of the language has been in decline since the 1950s. There are very few Irish-speakers in Kincasslagh today, much like neighbouring villages Mullaghduff and Burtonport.
Kincasslagh has a long history of emigration, much like the rest of West Donegal. In the 1950s and 1960s, a large number of locals left the area to work in countries such as the UK (England and especially Scotland), USA and Australia.