Cionn Caslach 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 Rosses is a traditional 'district' in the west of County Donegal in Ulster, the northern province in Ireland. The Rosses has a population of over 7,000 centred on the town of Dungloe, which acts as the educational, shopping and civic centre for the area. Defined by physical boundaries in the form of rivers, as well as history and language use, the area has a distinctive identity, separate from the rest of County Donegal. The extensive district lies between the parish and district of Gweedore to the north and the town of Glenties to the south. A large part of the Rosses is in the Gaeltacht, which means that Irish is the spoken language. The Rosses, Cloughaneely and Gweedore, known locally as "the three parishes", with 16,000 Irish speakers, together form a social and cultural region different from the rest of the county, with Gweedore serving as the main centre for socialising and industry. Gaeltacht an Láir is another Irish-speaking area.