Eilean Chaluim Chille (Gaelic: island of Saint Columba, Calum Cille) is an unpopulated island in the Outer Hebrides. It lies off the east coast of Lewis at the mouth of Loch Erisort. The island reaches a height of 43m (141 feet) in the northeast. At low tide Eilean Chaluim Chille is connected by a causeway to the mainland of Lewis at Crobeag. There are two lochs in the centre of the island.