| Island’s Name |
Island group(s) |
Country/Countries |
| Gabaret |
Mississippi River, Illinois |
United States |
| Gabriola |
Gulf Islands, British Columbia |
Canada |
| Gaga |
Beira Litoral Islands |
Portugal |
| Gaivota |
Beira Litoral Islands |
Portugal |
| Gairsay |
The North Isles, Orkney Islands |
Scotland |
| Galiano |
Gulf Islands, British Columbia |
Canada |
| Galila |
Lake Zway |
Ethiopia |
| Gall |
Lough Erne |
Ireland |
| Gallinara |
|
Italy |
| Galt |
North Channel, Ontario |
Canada |
| Galveston |
Texas |
United States |
| Gansy |
Lake Winnipesaukee, New Hampshire |
United States |
| Gapøya |
|
Norway |
| Garden |
Lake Huron, Ontario |
Canada |
| Garden |
Lake Nipissing, Ontario |
Canada |
| Garden |
Saint Lawrence River, Ontario |
Canada |
| Garden |
Western Australia |
Australia |
| Gardner |
Louisiana |
United States |
| Garove |
Vitu Islands |
Papua New Guinea |
| Garratt |
West Lake Ontario |
Canada |
| Gasket |
West Lake Ontario |
Canada |
| Gateshead |
Nunavut |
Canada |
| Gaua |
Banks Islands |
Vanuatu |
| Gavi |
Pontine Islands |
Italy |
| Gavdos |
|
Greece |
| Geada |
Algarve Islands |
Portugal |
| Geike |
Lake Nipigon, Ontario |
Canada |
| Genovesa |
Galápagos Islands |
Ecuador |
| Geomundo |
|
South Korea |
| George |
Falkland Islands |
United Kingdom |
| George |
Georgian Bay, Ontario |
Canada |
| Georgetown |
Ohio River, Pennsylvania |
United States |
| Georgina |
Lake Simcoe, Ontario |
Canada |
| Germ |
Persian Gulf |
Iran |
| Geronisos |
|
Cyprus |
| Gertrude |
North Channel, Ontario |
Canada |
| Gerumajima |
Kerama Islands part of the Okinawa Islands part of the Ryūkyū proper part of the Nansei Islands |
Japan |
| Gęsia Kępa |
Oder Lagoon islands |
Poland |
| Ghegheto |
Lake Huron, Ontario |
Canada |
| Giannutri |
Tuscan Archipelago |
Italy |
| Giants Tomb |
Georgian Bay, Ontario |
Canada |
| Gibbs |
South Shetland Islands |
Claimed by:
Argentine Antarctica, Argentina,
Antártica Chilena Province of Chile, and
British Antarctic Territory of the United Kingdom |
| Gigha |
Inner Hebrides |
Scotland |
| Giglio |
Tuscan Archipelago |
Italy |
| Gil |
British Columbia |
Canada |
| Gilbert |
Mississippi River, Missouri |
United States |
| Gilford |
British Columbia |
Canada |
| Gimsøya |
Lofoten |
Norway |
| Gioura |
Sporades |
Greece |
| Giudecca |
Venetian Lagoon |
Italy |
| Giske |
|
Norway |
| Gisløy |
|
Norway |
| Glims Holm |
Orkney Islands |
Scotland |
| Glines |
Lake Winnipesaukee, New Hampshire |
United States |
| Gloup Holm |
Shetland Islands |
Scotland |
| Glykiotissa |
|
Cyprus |
| Goat |
Lough Erne |
Ireland |
| Goat |
Whitsunday Islands, Queensland |
Australia |
| Goat |
Sydney Harbor |
Australia |
| Goat |
Auckland Region |
New Zealand |
| Goat |
Otago Harbour |
New Zealand |
| Goat |
Niagara Falls New York |
United States |
| Goat |
Rhode Island |
United States |
| Goat |
Maine |
United States |
| Goat |
North Channel, Ontario |
Canada |
| Goat |
South Carolina |
United States |
| Gödi-sziget |
|
Hungary |
| Godøy |
|
Norway |
| Goeree-Overflakkee |
part of the Dutch province South Holland |
Netherlands |
| Gokceada |
Aegean Islands |
Turkey |
| Goli otok |
translates as "naked island" |
Croatia |
| La Gomera |
Canary Islands |
Spain |
| Goodin |
Mississippi River, Minnesota |
United States |
| Goose |
Lake Nipissing, Ontario |
Canada |
| Goose |
British Columbia |
Canada |
| Goose |
San Juan Islands, Washington |
United States |
| Gooseberry |
North Channel, Ontario |
Canada |
| Goree |
Dakar |
Senegal |
| Gorgona |
|
Colombia |
| Gorgona |
Tuscan Archipelago |
Italy |
| Gossa |
|
Norway |
| Gotland |
|
Sweden |
| Gotska Sandön |
|
Sweden |
| Gough |
Tristan da Cunha |
British Overseas Territory of Saint Helena |
| Governor |
Thimble Islands, Connecticut |
United States |
| Governor |
Georgian Bay, Ontario |
Canada |
| Governors |
Lake Winnipesaukee, New Hampshire |
United States |
| Gower |
Cumberland River, Tennessee |
United States |
| Gozo |
Għawdex, Maltese islands |
Malta |
| Graciosa |
Azores |
Portugal |
| Graciosa |
Canary Islands |
Spain |
| Graemsay |
Orkney Islands |
Scotland |
| Graham |
Queen Elizabeth Islands, Nunavut |
Canada |
| Graham |
Queen Charlotte Islands, British Columbia |
Canada |
| Gramatal Island |
Beira Litoral Islands |
Portugal |
| Gran Canaria |
Canary Islands |
Spain |
| Granary |
Islands of Gdańsk |
Poland |
| Grand Cayman |
Cayman Islands |
United Kingdom |
| Grand |
Jason Islands of the Falkland Islands |
United Kingdom |
| Grand |
Balsam Lake, Ontario |
Canada |
| Grand |
Louisiana |
United States |
| Grand |
Louisiana |
United States |
| Grand |
Lake Champlain, Vermont |
United States |
| Grand Manan |
New Brunswick |
Canada |
| Grand Terre |
Louisiana |
United States |
| Grande Comore |
Comoros |
Comoros |
| Grape |
Lake Simcoe, Ontario |
Canada |
| Gräsö |
|
Sweden |
| Gravelly |
Lough Erne |
Ireland |
| Gravine |
Mobile Bay, Alabama |
United States |
| Gray |
Georgian Bay, Ontario |
Canada |
| Great Blasket |
Blasket Islands |
Ireland |
| Great Britain |
|
United Kingdom |
| Great |
Falkland Islands |
United Kingdom |
| Great |
Cork Harbour |
Ireland |
| Great |
Massachusetts |
United States |
| Great La Cloche |
North Channel, Ontario |
Canada |
| Great Manitou |
Lake Nipissing, Ontario |
Canada |
| Great Nicobar |
Nicobar Islands |
India |
| Greater Mount Changtu |
Zhoushan Archipelago |
China |
| Greater Mount Yang |
Zhoushan Archipelago |
China |
| Greater Tunbs |
Persian Gulf |
Iran |
| Green |
Queensland |
Australia |
| Green |
New South Wales |
Australia |
| Green |
Jersey, Channel Islands |
Crown dependency |
| Green |
Isles of Scilly |
United Kingdom |
| Green |
Poole Harbour |
United Kingdom |
| Green |
Rideau River, Ontario |
Canada |
| Green |
Severn Sound, Ontario |
Canada |
| Greene |
Ottawa River, Ontario |
Canada |
| Green |
Hong Kong |
China |
| Green |
Taitung County |
Republic of China |
| Green |
Red Sea |
Egypt |
| Greene |
Lake Huron, Ontario |
Canada |
| Greene |
Lake Ontario, Ontario |
Canada |
| Greenisland |
Northern Ireland |
United Kingdom |
Greenland  |
|
Denmark |
| Greenspond |
Newfoundland and Labrador |
Canada |
| Greenwich |
South Shetland Islands |
Claimed by:
Argentine Antarctica, Argentina,
Antártica Chilena Province of Chile, and
British Antarctic Territory of the United Kingdom |
| Grenadier |
Thousand Islands New York |
United States |
| Grenadier |
Saint Lawrence River Ontario |
Canada |
| Greifswalder Oie |
|
Germany |
| Grgur |
|
Croatia |
| Gribbell |
British Columbia |
Canada |
| Griffith |
Queen Elizabeth Islands, Nunavut |
Canada |
| Griffith |
Windmill Islands |
Antarctica |
| Griffith |
Georgian Bay, Ontario |
Canada |
| Grimes |
Mississippi River, Illinois |
United States |
| Grímsey |
|
Iceland |
| Grindstone |
Thousand Islands (Saint Lawrence River), New York |
United States |
| Grindstone |
Big Rideau Lake, Ontario |
Canada |
| Grip |
|
Norway |
| Gris Bourbe |
Louisiana |
United States |
| Grisvågøy |
|
Norway |
| Gröde-Appelland |
North Frisian Islands |
Germany |
| Groix |
Morbihan, Bretagne |
France |
| Grøtøy |
|
Norway |
| Grunay |
Out Skerries, Shetland Islands |
Scotland |
| Gruney |
Shetland Islands |
Scotland |
| Grytøy |
Vesterålen |
Norway |
| Guam |
|
United States |
| Guemes |
San Juan Islands, Washington |
United States |
| Guernsey |
Guernsey, Channel Islands |
Crown dependency |
| Gull |
Lake Nipissing, Ontario |
Canada |
| Gull |
Lake Ontario, Ontario |
Canada |
| Gull |
Lake Mead, Nevada |
United States |
| Gunnison |
Great Salt Lake, Utah |
United States |
| Gurskøy |
|
Norway |
| Gyali |
Dodecanese |
Greece |
| Gyaros |
Cyclades |
Greece |