- Abbott's Starling
- Aberdare Cisticola
- Abyssinian Crimsonwing
- Aceh Bulbul
- African Broadbill
- African Citril
- African Cuckoo
- African Dusky Flycatcher
- African Firefinch
- African Goshawk
- African Hill Babbler
- African Olive Pigeon
- African Paradise Flycatcher
- African Pitta
- African Pygmy Kingfisher
- African Red-eyed Bulbul
- African Stonechat
- African Wattled Lapwing
- African Yellow Warbler
- Agile Tit-Tyrant
- Agulhas Long-billed Lark
- Aleutian Tern
- Allpahuayo Antbird
- Alpine Thrush
- Amazonian Antpitta
- Amazonian Barred Woodcreeper
- Amazonian Inezia
- Amazonian Scrub Flycatcher
- Amazonian Trogon
- Amazonian Umbrellabird
- American Bittern
- American Flamingo
- American Redstart
- Ancash Tapaculo
- Anchieta's Sunbird
- Ancient Antwren
- Andean Cock-of-the-rock
- Andean Coot
- Andean Duck
- Andean Guan
- Andean Motmot
- Andean Parakeet
- Andean Potoo
- Andean Pygmy Owl
- Andean Slaty Thrush
- Andean Solitaire
- Anna's Hummingbird
- Anthony's Nightjar
- Antioquia Bristle Tyrant
- Aplomado Falcon
- Apolinar's Wren
- Appert's Tetraka
- Apurimac Brushfinch
- Araripe Manakin
- Archbold's Newtonia
- Arctic Warbler
- Arnot's Chat
- Arrow-marked Babbler
- Ash-breasted Tit-Tyrant
- Ash-throated Casiornis
- Ashy-headed Tyrannulet
- Ashy-throated Warbler
- Ashy Bulbul
- Ashy Cisticola
- Ashy Robin
- Ashy Starling
- Asian Dowitcher
- Asian Emerald Cuckoo
- Asian Green Bee-eater
- 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-rumped Parrot
- Azure-shouldered Tanager
- Azure Dollarbird
- Azure Kingfisher