List of islands by name (U)

This is a list of islands, organized alphabetically by name, beginning with the letter "U". This list may include islands that are part of archipelagos, single isolated islands, and islands of varying sizes and political affiliations. The purpose is to provide a comprehensive, though not necessarily exhaustive, catalog of islands starting with the letter "U".

Note that island names can sometimes be ambiguous or disputed, and the inclusion of an island on this list does not necessarily reflect any particular political stance or territorial claim. The list aims to be geographically informative and is based on currently available and generally accepted naming conventions.

Islands listed may be categorized by country, region, or other relevant geographical or political divisions in more detailed, linked entries where available. Further information about the size, location, history, and ecology of each island can often be found through their respective linked pages or related resources.

The following islands are included:

• Ugljan (Croatia): An island off the coast of Croatia in the Adriatic Sea.
• Uist, North (Scotland): One of the islands of the Outer Hebrides in Scotland.
• Uist, South (Scotland): Another island of the Outer Hebrides in Scotland, lying south of North Uist.
• Ujae Atoll (Marshall Islands): A coral atoll in the Ralik Chain of the Marshall Islands.
• Ukerewe (Tanzania): The largest island in Lake Victoria.
• Ulleungdo (South Korea): A volcanic island in the East Sea (Sea of Japan).
• Unalaska Island (United States): Part of the Aleutian Islands in Alaska.
• Unimak Island (United States): The largest island in the Aleutian Islands of Alaska.
• Union Island (Saint Vincent and the Grenadines): An island in Saint Vincent and the Grenadines.
• Upolu (Samoa): One of the main islands of Samoa.
• Uranium Island (Canada): Located in Lake Athabasca, Saskatchewan. Notable for uranium mining.
• Usedom (Germany/Poland): An island shared by Germany and Poland in the Baltic Sea.
• Ushant (France): An island off the coast of Brittany, France.
• Utila (Honduras): One of the Bay Islands of Honduras.
• Utsira (Norway): An island municipality in Rogaland county, Norway.
• Uvea (Wallis Island) (Wallis and Futuna): The main island in the Wallis Islands group, part of the French overseas collectivity of Wallis and Futuna.