This is a list of islands of the United Kingdom. The United Kingdom of Great Britain and Northern Ireland has thousands of islands within its territory and several external territories. 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.
Main article: List of islands of England
Northern Ireland is a part of the island of Ireland, see; list of islands of Ireland and list of inland islands of Ireland.
Main article: List of islands of Scotland
Main article: List of islands of Wales
Ascension Island is a dependency of Saint Helena.
Much of the British Antarctic Territory is also included in the overlapping claims of Chile and Argentina. None of these claims have gained wide international recognition (only the British claim gained any) and are suspended. All are regulated by the Antarctic Treaty
Main article: List of islands of the Falkland Islands
The Falkland Islands are also claimed by Argentina, see: Falkland Islands sovereignty dispute.
South Georgia and the South Sandwich Islands are also claimed by Argentina. See Falkland Islands sovereignty dispute.
Tristan da Cunha is a dependency of Saint Helena.