The Nicolson Institute (Gaelic: Àrd-sgoil MhicNeacail) in Stornoway, is the largest school in the Western Isles, Scotland.

With the Sir E. Scott School in Harris, they provide education up to Advanced Higher level.

There are five houses, named after five significant former rectors: Addison, Forbes, Gibson, Macrae and Sutherland.

In 2006 the school was the site of an international custody battle after first year pupil Misbah Rana (also known as Molly Campbell) absconded to Pakistan.

[3] In 2010, a cage/enclosure intended as a play area for a severely autistic pupil was removed, with the local authority claiming that the supplier had not understood the requirements.