Eilean Kearstay (Scottish Gaelic: Eilean Chearstaigh) is an uninhabited island in Loch Roag in the Outer Hebrides of Scotland.
It lies south east of Great Bernera, just across the water from the headland of Callanish.
In 1990 the island was sold by Prince Robin de la Lanne-Mirrlees to an Australian. It was sold to new owners three years later.