Eilean Aigas (NH4641) (Scottish Gaelic: Eilean Àigeis, pronounced [elanˈaɡ̊ʲəʃ]) is an island in the River Beauly, Scotland, in Kiltarlity parish in traditional Inverness-shire, now Highland Region. It is most notable for the mansion on it at its north end, which was formerly owned by the Sobieski Stuarts and rented by author and Scottish nationalist Compton Mackenzie from Lord Fraser of Lovat.