Unst is one of the North Isles of the Shetland Islands, Scotland. It is the northernmost of the inhabited British Isles and is the third largest island in Shetland after the Mainland and Yell. It has an area of 46 square miles.

The island lays claims to many "most northerly" UK titles: the tiny settlement of Skaw in the north-east of the island is the northernmost settlement in the UK; the Muckle Flugga lighthouse, just off the far north of Unst, was opened in 1858 and is the most northerly lighthouse in the UK, situated close to Out Stack, the most northerly rock in the UK.

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