Encyclopedias, Almanacs, Transcripts, and Maps
- Australian bear
- Australian cattle dog
- Australian football
- Australian kelpie
- Australian terrier
- Austråt
- Austrian literature
- Austronesian
- Authari
- authentic modes
- autograft
- automatic direction finder
- automatic frequency control
- automatic tuning control
- autonomous underwater vehicle
- autumn crocus
- Aux Cayes
- Auyuittuq National Park
- Ava (village, Myanmar)
- Avacha