List of islands of the United Kingdom

This is a list of selected British islands grouped by constituent country or overseas territory.

The largest British island is Great Britain, which forms a substantial majority of the United Kingdom and is the ninth-largest island in the world.

Much of the British Antarctic Territory is also included in the overlapping claims of Chile and Argentina.

St Helena, Ascension and Tristan da Cunha have formed the British Overseas Territory of Saint Helena, Ascension and Tristan da Cunha since 2009.

The Crown dependencies are not part of the United Kingdom.