| |
|---|---|
| Location | |
| OS grid reference | NF880913 |
| Coordinates | 57°48′N 7°15′W / 57.80°N 7.25°W |
| Name | |
| Name meaning | seal island |
| Old Norse name | selr-øy |
| Physical geography | |
| Island group | Lewis and Harris |
| Area | 47 ha (120 acres) |
| Area rank | 208 |
Highest elevation | 79 m (259 ft) |
| Administration | |
| Council area | Na h-Eileanan Siar |
| Country | Scotland |
| Sovereign state | United Kingdom |
| Demographics | |
| Population | 0 |
| References | |

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