word | | Country name |
| Ascension | Saint Helena | conventional long form: Saint Helena, Ascension, and Tristan da Cunha conventional short form: none |
| ash | Algeria | conventional long form: People's Democratic Republic of Algeria conventional short form: Algeria local long form: Al Jumhuriyah al Jaza'iriyah ad Dimuqratiyah ash Sha'biyah local short form: Al Jaza'ir |
| Ashmore | Ashmore and Cartier Islands | conventional long form: Territory of Ashmore and Cartier Islands conventional short form: Ashmore and Cartier Islands |
| atasi | Samoa | conventional long form: Independent State of Samoa conventional short form: Samoa local long form: Malo Sa'oloto Tuto'atasi o Samoa local short form: Samoa former: Western Samoa |
| Atoll | United States Pacific Island Wildlife Refuges | conventional long form: none conventional short form: Baker Island; Howland Island; Jarvis Island; Johnston Atoll; Kingman Reef; Midway Islands; Palmyra Atoll |
| Australes | 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 |
| Australia | Australia | conventional long form: Commonwealth of Australia conventional short form: Australia |
| Austria | Austria | conventional long form: Republic of Austria conventional short form: Austria local long form: Republik Oesterreich local short form: Oesterreich |
| authorities | Burma | ... form: Myanma Naingngandaw former: Socialist Republic of the Union of Burma note: since 1989 the military authorities in Burma have promoted the name Myanmar as a conventional name for their state; the ... |
| Autonomous | Eritrea | conventional long form: State of Eritrea conventional short form: Eritrea local long form: Hagere Ertra local short form: Ertra former: Eritrea Autonomous Region in Ethiopia |
| Ayiti | Haiti | conventional long form: Republic of Haiti conventional short form: Haiti local long form: Republique d'Haiti/Repiblik d' Ayiti local short form: Haiti/Ayiti |