Mweelrea is a mountain on the Atlantic coast of County Mayo, Ireland. Rising to 814 metres (2,671 ft), it is the highest mountain in the western province of Connacht, and is noted for its southeastern cliff-lined corries, and its views. Mweelrea overlooks Killary Harbour and is at the heart of a "horseshoe-shaped" massif that includes the peaks of Ben Lugmore and Ben Bury. The massif is called the Mweelrea Mountains or the Mweelrea Range.

Connacht or Connaught, is one of the four provinces of Ireland, in the west of Ireland. Until the ninth century it consisted of several independent major Gaelic kingdoms.