The Coolera Peninsula (Irish: Cúil Iorra) is a peninsula in Sligo Bay, County Sligo, Ireland. It is the most populous of County Sligo's peninsulas, and the second-largest by land area. The primary population centres on Coolera are the coastal town of Strandhill on its western shore, and Magheraboy, a suburb of Sligo town.
The peninsula is characterised by a vast network of Megalithic and Neolithic tombs, cairns and ringforts spread out across its landscape. The Carrowmore Megalithic Complex dates back to the 4th millennium BC, and is one of the largest megalithic complexes in Ireland. The 30,000-tonne tomb of Queen Médb, known as Miosgán Médhbh, sits atop Knocknarea mountain and is clearly visible from much of northern Sligo. Taken together, Sligo County Council has applied for this network of ancient monuments to be recognised as a UNESCO World Heritage Site.