Shillay (Scottish Gaelic: Siolaigh) is an uninhabited island which lies 2 km north of Pabbay in the Outer Hebrides of Scotland.

The name is derived from the Norse selr-øy meaning seal island and is a Scottish Wildlife Trust reserve owing to its international importance for breeding grey seals.

There is no record or evidence that it has ever seen human habitation.

Footnotes

57°48′08″N 7°15′15″W/57.80220°N 7.25415°W/ 57.80220; -7.25415