word | | Country name |
| American | American Samoa | conventional long form: Territory of American Samoa conventional short form: American Samoa abbreviation: AS |
| Anachak | Thailand | conventional long form: Kingdom of Thailand conventional short form: Thailand local long form: Ratcha Anachak Thai local short form: Prathet Thai former: Siam |
| Andorra | Andorra | conventional long form: Principality of Andorra conventional short form: Andorra local long form: Principat d'Andorra local short form: Andorra |
| anga | Tonga | conventional long form: Kingdom of Tonga conventional short form: Tonga local long form: Pule'anga Tonga local short form: Tonga former: Friendly Islands |
| Anglo | Sudan | conventional long form: Republic of the Sudan conventional short form: Sudan local long form: Jumhuriyat as-Sudan local short form: As-Sudan former: Anglo-Egyptian Sudan |
| Angola | Angola | conventional long form: Republic of Angola conventional short form: Angola local long form: Republica de Angola local short form: Angola former: People's Republic of Angola |
| Anguilla | Anguilla | conventional long form: none conventional short form: Anguilla |
| Antarctic | French Southern and Antarctic Lands | conventional long form: Territory of the French Southern and Antarctic Lands conventional short form: French Southern and Antarctic Lands local long form: Territoire des Terres Australes et Antarctiques Francaises local short form ... |
| Antarctica | Antarctica | conventional long form: none conventional short form: Antarctica |
| Antarctiques | French Southern and Antarctic Lands | ... Southern and Antarctic Lands conventional short form: French Southern and Antarctic Lands local long form: Territoire des Terres Australes et Antarctiques Francaises local short form: Terres Australes et Antarctiques Francaises abbreviation: TAAF |
| Antigua | Antigua and Barbuda | conventional long form: none conventional short form: Antigua and Barbuda |