Slieve Carr, also known as Slieve Cor or Corslieve (), is a mountain with a height of in County Mayo, Ireland. It is part of the Nephin Range and is beside Nephin Beg. The mountain is in Wild Nephin National Park and it is the most remote point of land on the Irish mainland.
Slieve Carr is a long mountain running north-south, with several small lakes on its eastern slopes. On the summit is a burial cairn known as Laghtdauhybaun, from Leacht Dáithí Bháin, 'burial monument of white Dáithí'. This is believed to refer to Dathí, a king of Connacht in the 5th century.