- Abbott's Starling
- Aceh Bulbul
- African Citril
- African Red-eyed Bulbul
- African Yellow Warbler
- Agile Tit-Tyrant
- Agulhas Long-billed Lark
- Aleutian Tern
- Alpine Thrush
- Amazonian Barred Woodcreeper
- Amazonian Scrub Flycatcher
- American Bittern
- American Redstart
- Anchieta's Sunbird
- Andean Coot
- Anna's Hummingbird
- Appert's Tetraka
- Archbold's Newtonia
- Arctic Warbler
- Arrow-marked Babbler
- Ashy-throated Warbler
- Ashy Bulbul
- Ashy Robin
- Asian Dowitcher
- Asian Emerald Cuckoo
- Asian Red-eyed Bulbul
- Asian Short-toed Lark
- Atherton Scrubwren
- Auckland Shag
- Audouin's Gull
- Austral Canastero
- Austral Pygmy Owl
- Australian Boobook
- Australian Bustard
- Azores Bullfinch
- Aztec Thrush
- Azure-shouldered Tanager
- Azure Dollarbird
- Azure Kingfisher