| Aabenraa - Jutland
| Danish, Jutland - Denmark | Port |
| Aberdeen - Aberdeen Burghs - Aberdeenshire
| Aberdeen Burghs - Scotland
, Aberdeenshire - Scotland | City |
| Aberdeen Burghs - Scotland
| Scotland - Great Britain | Parliament constituency |
| Aberdeen Wharf - Limehouse Hole
| British, Limehouse Hole - Limehouse | Private Shipyard |
| Aberdeenshire - Scotland
| Scotland - Great Britain | County |
| Aboukir Bay
| Egyptian, Abu Qir Bay | Bay |
| Abu Qir Bay
| Egyptian | Bay |
| Acadie - Nouvelle-France
| French, Nouvelle-France - North America | Geographic Area |
| Acapulco de Juárez - Mexico
| Mexico - North America | Port |
| Acre - Haifa Bay
| Haifa Bay - The Mediterranean Sea | Port |
| Adbaston - Staffordshire
| British, Staffordshire - England | Village |
| Admiralitätswerft Hamburg - Hamburg
| Hanseatic, Hamburg - Germany - Holy Roman Empire | Naval Dockyard |
| Admiralty Yard - Saint Petersburg
| Russian, Saint Petersburg - Russia | Naval Dockyard |
| Adriatic Sea - The Mediterranean Sea
| The Mediterranean Sea | Geographic Area |
| Aegean Sea - The Mediterranean Sea
| The Mediterranean Sea | Geographic Area |
| Africa
| | Continent |
| Agde - Languedoc
| French, Languedoc - France | Port |
| Aguada
| Spanish | Port |
| Aigues-Mortes - Languedoc
| French, Languedoc - France | Port |
| Aix-en-Provence - Provence
| French, Provence - France | City |
| Ajaccio - Corsica
| Genovese, Corsica - France - The Mediterranean Sea | Port |
| Ajaccio Dockyard - Ajaccio
| British, Ajaccio - Corsica | Naval Dockyard |
| Alabama
| American | State |
| Åland - Finland - Gulf of Bothnia
| Swedish, Finland - Scandinavian Peninsula
, Gulf of Bothnia - Baltic Sea | Archipelago |
| Aldborough - Yorkshire
| Yorkshire - England | Town |
| Aldburgh - Suffolk
| British, Suffolk - England | Port |
| Aldeburgh - Suffolk
| Suffolk - England | Parliament constituency |
| Alderney - The Channel Islands
| The Channel Islands - English Channel | Island |
| Aleutian Islands - Pacific Ocean
| Pacific Ocean | Archipelago |
| Alexander Archipelago - Pacific Ocean
| Pacific Ocean | Archipelago |
| Alexandria - Egypt
| Egypt - Africa | Port |
| Algeria - Africa
| Algerian, Africa | Nation |
| Algiers - Algeria
| Algerian, Algeria - Africa | Port |
| Almería - Andalusia
| Andalusia - Spain | Port |
| Alsace - France
| France - Europe | Province |
| Älvkarleby - Uppland
| Swedish, Uppland - Svealand | Port |
| Älvsborg - Göteborg
| Swedish, Göteborg - Västergötland | Port |
| Amherstberg - Lake Erie - Ontario
| British, Canadian, Lake Erie - Great Lakes
, Ontario - Canada | Port |
| Amsterdam - Holland
| Dutch, Spanish, Austrian, Dutch, , Holland - Netherlands | Port |
| Amsterdam Naval Yard - Amsterdam
| Dutch, Amsterdam - Holland | Naval Dockyard |
| Amsterdam, East India Dockyard - Amsterdam
| Dutch, Amsterdam - Holland | Private Shipyard |
| Anchor Wharf - Rotherhithe
| Rotherhithe - London - Surrey | Private Shipyard |
| Ancona - Italy
| Italy - Europe | Province |
| Ancona - Ancona
| Ancona - Italy | Port |
| Ancône - Italy
| Italy - Europe | Province |
| Ancône - Ancona
| Ancona - Italy | Port |
| Andalusia - Spain
| Spain - Iberian Peninsula | Province |
| Andaman Islands - Bay of Bengal
| Bay of Bengal - Indian Ocean | Archipelago |
| Andaman Sea - Indian Ocean
| Indian Ocean | Geographic Area |
| Andreanof Islands - Aleutian Islands
| Aleutian Islands - Pacific Ocean | Archipelago |