- Abbott's Starling
- Aberdare Cisticola
- Aberrant Bush Warbler
- Abyssinian Crimsonwing
- Abyssinian Roller
- Abyssinian Sunbird
- Abyssinian White-eye
- Aceh Bulbul
- Acre Antshrike
- African Broadbill
- African Citril
- African Collared Dove
- African Cuckoo
- African Cuckoo-Hawk
- African Dusky Flycatcher
- African Firefinch
- African Golden Oriole
- African Goshawk
- African Harrier-Hawk
- African Hill Babbler
- African Olive Pigeon
- African Paradise Flycatcher
- African Pitta
- African Pygmy Kingfisher
- African Red-eyed Bulbul
- African River Martin
- African Stonechat
- African Wattled Lapwing
- African Yellow Warbler
- Agami Heron
- Agile Tit-Tyrant
- Agulhas Long-billed Lark
- Aleutian Tern
- Allpahuayo Antbird
- Alor Boobook
- Alor Myzomela
- Alpine Thrush
- Alta Floresta Antpitta
- Altamira Oriole
- Altamira Yellowthroat
- Amazonian Antpitta
- Amazonian Antshrike
- Amazonian Barred Woodcreeper
- Amazonian Black Tyrant
- Amazonian Inezia
- Amazonian Pygmy Owl
- Amazonian Scrub Flycatcher
- Amazonian Streaked Antwren
- Amazonian Trogon
- Amazonian Umbrellabird
- Ambon White-eye
- Ameline Swiftlet
- American Bittern
- American Black Swift
- 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
- Angola Batis
- Angola Swallow
- Anna's Hummingbird
- Ansorge's Greenbul
- Antarctic Petrel
- Antarctic Shag
- Antarctic Tern
- Anthony's Nightjar
- Antioquia Bristle Tyrant
- Aplomado Falcon
- Apolinar's Wren
- Appert's Tetraka
- Apricot-breasted Sunbird
- Apurimac Brushfinch
- Arabian Babbler
- Arabian Eagle-Owl
- Arabian Golden Sparrow
- Arabian Lark
- Arabian Partridge
- Arabian Scops Owl
- Arabian Serin
- Arabian Sunbird
- Arabian Waxbill
- Arabian Wheatear
- Araripe Manakin
- Archbold's Newtonia
- Arctic Warbler
- Arizona Woodpecker
- Arnot's Chat
- Arrow-marked Babbler
- Ascension Frigatebird
- Ash-breasted Tit-Tyrant
- Ash-colored Cuckoo
- Ash-colored Tapaculo
- Ash-throated Casiornis
- Ashy-bellied White-eye
- Ashy-fronted Bulbul
- Ashy-headed Goose
- Ashy-headed Tyrannulet
- Ashy-throated Warbler
- Ashy Bulbul
- Ashy Cisticola
- Ashy Flowerpecker
- Ashy Robin
- Ashy Starling
- Ashy Tailorbird
- Asian Dowitcher
- Asian Emerald Cuckoo
- Asian Green Bee-eater
- Asian Red-eyed Bulbul
- Asian Short-toed Lark
- Asir Magpie
- Atherton Scrubwren
- Atlantic Petrel
- Auckland Shag
- Audouin's Gull
- Austral Blackbird
- Austral Canastero
- Austral Pygmy Owl
- Austral Rail
- Austral Thrush
- Australian Boobook
- Australian Bustard
- Azara's Spinetail
- Azores Bullfinch
- Aztec Thrush
- Azure-hooded Jay
- Azure-naped Jay
- Azure-rumped Parrot
- Azure-shouldered Tanager
- Azure Dollarbird
- Azure Kingfisher