| Island’s Name | Island group(s) | Country/Countries |
|---|
|
| A Nova | Beira Baixa islands |  Portugal |
| Abbasak | Persian Gulf |  Iran |
| Aberdeen | Georgian Bay,  Ontario |  Canada |
| Abner Cay | Bahamas |  Bahamas |
| Abruka | Gulf of Riga |  Estonia |
| Absecon |  New Jersey |  United States |
| Abu Musa | Persian Gulf | Claimed by Iran and  United Arab Emirates |
| Acheron | Great Palm Island,  Queensland |  Australia |
| Achill | |  Ireland |
| Achillbeg | | Ireland |
| Acklins | Bahamas | Bahamas |
| Acton | Lake Muskoka, Ontario | Canada |
| Adam | Lesser Antilles |  Grenada |
| Adams | Antarctica | |
| Adams |  Massachusetts | United States |
| Adams | Auckland Islands |  New Zealand |
| Adams |  Nunavut | Canada |
| Adams Key | Florida Keys,  Florida | United States |
| Adderly Cay | Bahamas | Bahamas |
| Adelaide | Marguerite Bay off the west coast of the Antarctic Peninsula | Antarctica |
| Adelaide | St. Lawrence River, Ontario | Canada |
| Adelsö | Lake Mälaren |  Sweden |
| Adhelfopoulo | Sporades |  Greece |
| Admiralty |  Alaska | United States |
| Admiralty | Nunavut | Canada |
| Admiralty | Saint Lawrence River, Ontario | Canada |
| Æbelø | The Kattegat |  Denmark |
| Aegina | Saronic Islands | Greece |
| Aegna | Tallinn Bay, Baltic Sea | Estonia |
| Ærø | Baltic Sea | Denmark |
| Agar's |  Bermuda |  United Kingdom |
| Agathonisi | Dodecanese | Greece |
| Agatti | Lakshadweep |  India |
| Agerø | Limfjord | Denmark |
| Agersø | Great Belt | Denmark |
| Agios Efstratios | | Greece |
| Agnes | Queensland | Australia |
| Agolada | Ribatejo islands | Portugal |
| Agrihan |  Northern Mariana Islands | United States |
| Agunijima | Okinawa Islands part of the Ryukyu Islands |  Japan |
| Ahe | King George Islands,  Tuamotus,  French Polynesia |  France |
| Ahelaid | Väinameri Sea | Estonia |
| Cayo Ahogado | Greater Antilles, Puerto Rico | United States |
| Ahtra | Pärnu Bay, Gulf of Riga | Estonia |
| Ailinginae | Ralik Chain |  Marshall Islands |
| Ailinginae Atoll | Ralik Chain | Marshall Islands |
| Ailinglapalap | Ralik Chain | Marshall Islands |
| Ailinglapalap Atoll | Ralik Chain | Marshall Islands |
| Ailuk | Ratak Chain | Marshall Islands |
| Ailuk Atoll | Ratak Chain | Marshall Islands |
| Air Force | Queen Elizabeth Islands, Nunavut | Canada |
| Aipus | Torres Strait Islands Queensland | Australia |
| Aitutaki | Cook Islands |  Cook Islands |
| Ajeltokrok | Arno Atoll | Marshall Islands |
| Ajirah | Hawar Islands |  Bahrain |
| Akajima | Kerama Islands part of the Okinawa Islands part of the Ryukyu Islands | Japan |
| Akimiski | James Bay, Nunavut | Canada |
| Akpatok | Queen Elizabeth Islands, Nunavut | Canada |
| Aksi | Gulf of Finland | Estonia |
| Akusekijima | Tokara Islands part of the Satsunan Islands part of the Ryukyu Islands | Japan |
| Aikin |  Alabama | United States |
| Al Hajiyat | Hawar Islands | Bahrain |
| Al Wakur | Hawar Islands | Bahrain |
| Alameda | Islands of San Francisco Bay,  California | United States |
| Åland | Archipelago Sea,  Åland Islands |  Finland |
| Albany | Torres Strait Islands Queensland | Australia |
| Albatross |  Tasmania | Australia |
| Isla de Alborán | Plazas de Soberanía, Strait of Gibraltar | Disputed between  Spain and  Morocco |
| Alcarraza | Greater Antilles, Puerto Rico | United States |
| Alcatraz | Islands of San Francisco Bay, California | United States |
| Alcorn | Moon Lake,  Mississippi | United States |
| Alcsi-sziget | Tisza |  Hungary |
| Alder Cay | Bahamas | Bahamas |
| Alderney | Channel Islands | Crown dependency |
| Alegranza |  Canary Islands | Spain |
| Alejandro Selkirk | Juan Fernández archipelago |  Chile |
| Alexander | Queen Elizabeth Islands, Nunavut | Canada |
| Cayo Alfenique | Greater Antilles, Puerto Rico | United States |
| Alger | Fulton Chain Lakes,  New York | United States |
| Cayo Algodones | Greater Antilles, Puerto Rico | United States |
| Alicudi | Aeolian Islands |  Italy |
| Alimia | Dodecanese | Greece |
| All Awash | Lesser Antilles |  Saint Vincent and the Grenadines |
| Allan Cays | Bahamas | Bahamas |
| Allans Cay | Bahamas | Bahamas |
| Alligator | Alabama | United States |
| Allirahu | Gulf of Riga | Estonia |
| Allison | Torres Strait Islands, Queensland | Australia |
| Almourol | Ribatejo islands | Portugal |
| Alnön | | Sweden |
| Alonissos | Sporades | Greece |
| Alpha | Bermuda | United Kingdom |
| Als | Baltic Sea | Denmark |
| Alumine Vaika | Vaika Islands | Estonia |
| Isla Altamuria |  Sinaloa |  Mexico |
| Alty |  Delaware | United States |
| Amager | Øresund | Denmark |
| Amami Ōshima | Amami Islands part of the Satsunan Islands part of the Ryukyu Islands | Japan |
| Amanu | Tuamotus, French Polynesia | France |
| Ambae | Pacific Ocean |  Vanuatu |
| Ambergris Cay | Bahamas | Bahamas |
| Ambrym | New Hebrides | Vanuatu |
| Ambu | Arabian Sea | India |
| Amedroz | North Channel, Ontario | Canada |
| Ameland | West Frisian Islands |  Netherlands |
| Amelia | Sea Islands, Florida | United States |
| Amherst | Lake Ontario, Ontario | Canada |
| Amini | Lakshadweep | India |
| Ammerön | | Sweden |
| Amores | Minho islands | Portugal |
| Amorgos | Cyclades | Greece |
| Amoroso | Beira Litoral Islands | Portugal |
| Åmøy | |  Norway |
| Amrita | Massachusetts | United States |
| Amrum | North Frisian Islands |  Germany |
| Amsterdam | Indian Ocean | France |
| Amund Ringnes Island | Sverdrup Islands group of the Queen Elizabeth Islands, Nunavut | Canada |
| Amygdaloid | Lake Superior,  Michigan | United States |
| Anacapa | Channel Islands of California | United States |
| Anafi | Cyclades | Greece |
| Anastasia | Matanzas River, Florida | United States |
India | Bay of Bengal, India | |
Anatahan | Northern Mariana Islands | United States |
| Anaho | Pyramid Lake,  Nevada | United States |
| Anatom | Pacific Ocean | Vanuatu |
| Anchor | Torres Strait Islands, Queensland | Australia |
| Andalusia | Mississippi River,  Illinois | United States |
| Anderson Cay | Bahamas | Bahamas |
| Anderson's Ledge | Isles of Shoals,  New Hampshire | United States |
| Anderson | Puget Sound,  Washington | United States |
| Andørja | | Norway |
| Andøy | Vesterålen | Norway |
| Andrott | Lakshadweep | India |
| Andros | Cyclades | Greece |
| Andros | Bahamas | Bahamas |
| Anegada | Lesser Antilles,  British Virgin Islands | United Kingdom |
| Angel Cays | Bahamas | Bahamas |
| Isla Ángel de la Guarda |  Baja California | Mexico |
| Angel | Islands of San Francisco Bay, California | United States |
| Angijak | Nunavut | Canada |
| Angistri | | Greece |
| Angle Cay | Bahamas | Bahamas |
| Angoche | |  Mozambique |
| Anglesey | North Wales |  Wales |
| Anguila | Bahamas | Bahamas |
Anguilla  | Leeward Islands of the Lesser Antilles | British Overseas Territory of the United Kingdom |
| Anguillita | Leeward Islands of the Lesser Antilles, Anguilla | British Overseas Territory of the United Kingdom |
| Anholt | the Kattegat | Denmark |
| Aniwa | Pacific Ocean | Vanuatu |
| Anjouan | Comoros |  Comoros |
| Anna Cay | Bahamas | Bahamas |
| Annacis | Fraser River,  British Columbia | Canada |
| Annobon | Gulf of Guinea |  Equatorial Guinea |
| Anticosti | Saint Lawrence River,  Quebec | Canada |
| Antigua | Leeward Islands |  Antigua and Barbuda |
| Antikythera | | Greece |
| Antelope |  Arizona | United States |
| Antelope | Great Salt Lake,  Utah | United States |
| Antiparos | Cyclades | Greece |
| Antipsara | | Greece |
| Anuanuraro | Duke of Gloucester Islands, Tuamotus, French Polynesia | France |
| Anuanurunga | Duke of Gloucester Islands, Tuamotus, French Polynesia | France |
| Anuta | Melanesia |  Solomon Islands |
| Anydros | Cyclades | Greece |
| Aoba | Pacific Ocean | Vanuatu |
| Aogashima | Izu Islands | Japan |
| Apataki | Palliser Islands, Tuamotus, French Polynesia | France |
| Aplin | Queensland | Australia |
| Appledore | Isles of Shoals,  Maine | United States |
| Aquidneck | Aquidneck Island,  Rhode Island | United States |
| Aragusuku | Yaeyama Islands part of the Sakishima Islands part of the Ryukyu Islands | Japan |
| Aranysziget | Tisza | Hungary |
| Araura | Cook Islands | Cook Islands |
| Araway Cay | Bahamas | Bahamas |
| Arbuckle |  Arkansas | United States |
| Archer | Arkansas | United States |
| Archers Cay | Bahamas | Bahamas |
| Arden | Torres Strait Islands, Queensland | Australia |
| Ardy More | Lower Lough Erne | Ireland |
| Cayo Arenas | Greater Antilles, Puerto Rico | United States |
| Argyle | Lake Huron, Ontario | Canada |
| Ariana | Alentejo Islands | Portugal |
| Aristazabal | British Columbia | Canada |
| Arizona |  Wyoming | United States |
| Arkiko | Red Sea |  Eritrea |
| Arkoi | Dodecanese | Greece |
| Armathia | Dodecanese | Greece |
| Armona Island | Algarve islands | Portugal |
| Armstrong | Holston River,  Tennessee | United States |
| Arnold | Queensland | Australia |
| Arnøy | | Norway |
| Årø | Little Belt | Denmark |
| Arøya | | Norway |
| Arran | Scotland |  Scotland |
| Arranmore | County Donegal | Ireland |
| Arsenal | Mississippi River, Illinois | United States |
Aruba  | Lesser Antilles | Kingdom of the Netherlands |
| Aruro | Lake Abaya |  Ethiopia |
| Arutua | Palliser Islands, Tuamotus, French Polynesia | France |
| Ascension | | British overseas territory of Saint Helena, Ascension and Tristan da Cunha |
| Ascrib | | Scotland |
| Ash | Willamette River,  Oregon | United States |
| Asinara |  Sardinia | Italy |
| Askø | | Denmark |
| Asperö | Southern Gothenburg Archipelago | Sweden |
| Assateague |  Maryland and  Virginia | United States |
| Astakida | Dodecanese | Greece |
| Astipálaia | Dodecanese | Greece |
| Asuncion | Northern Mariana Islands | United States |
| Atholl | Bahamas | Bahamas |
| Atiu | Cook Islands | Cook Islands |
| Atkinson | Galveston Bay,  Texas | United States |
| Atløy | | Norway |
| Attu | Aleutian Islands | United States |
| Atwood Cay | Bahamas | Bahamas |
| Aubrey | St. Lawrence River, Ontario | Canada |
| Aubussi | Torres Strait Islands, Queensland | Australia |
| Auckland | Auckland Islands | New Zealand |
| Aughinish | County Clare | Ireland |
| Aughinish | County Limerick | Ireland |
| August Cay | Bahamas | Bahamas |
| Auhah | Persian Gulf |  Kuwait |
| Aukane | Torres Strait Islands, Queensland | Australia |
| Aulneau | St. Lawrence River, Ontario | Canada |
| Aur Atoll | Ratak Chain | Marshall Islands |
| Aureed | Torres Strait Islands, Queensland | Australia |
| Auskerry | The North Isles,  Orkney Islands | Scotland |
| Australia | Australia, Australia | Australia |
| Austvågøy | Lofoten | Norway |
| Aux Herbes | Mississippi Sound, Alabama | United States |
| Avernakø | | Denmark |
| Averøy | | Norway |
| Avery |  Louisiana | United States |
| Avsa | Marmara Islands |  Turkey |
| Axel Heiberg | Sverdrup Islands group of the Queen Elizabeth Islands, Nunavut | Canada |
| Azenha Brava | Alentejo islands | Portugal |
|