- Balearic Shearwater
- Bali Myna
- Bananaquit
- Bar-headed Goose
- Bar-tailed Godwit
- Bar-winged Flycatcher-shrike
- Bare-throated Tiger Heron
- Barn Swallow
- Barnacle Goose
- Barred Antshrike
- Barred Owl
- Barrow's Goldeneye
- Bearded Vulture
- Belted Kingfisher
- Bernier's Teal
- Berthelot's Pipit
- Black-and-white Warbler
- Black-capped Chickadee
- Black-capped Donacobius
- Black-capped Lory
- Black-cheeked Woodpecker
- Black-crowned Night Heron
- Black-eared Warbler
- Black-faced Grassquit
- Black-headed Cuckooshrike
- Black-headed Gull
- Black-headed Ibis
- Black-headed Parrot
- Black-headed Saltator
- Black-hooded Antshrike
- Black-legged Kittiwake
- Black-naped Fruit Dove
- Black-necked Aracari
- Black-necked Grebe
- Black-rumped Flameback
- Black-tailed Godwit
- Black-throated Blue Warbler
- Black-throated Green Warbler
- Black-throated Loon
- Black-winged Kite
- Black-winged Stilt
- Black Caracara
- Black Drongo
- Black Guillemot
- Black Kite
- Black Redstart
- Black Skimmer
- Black Stork
- Black Swan
- Black Tern
- Black Vulture
- Black Wheatear
- Blue-and-yellow Macaw
- Blue-backed Manakin
- Blue-billed Teal
- Blue-black Grassquit
- Blue-eared Kingfisher
- Blue-faced Malkoha
- Blue-grey Tanager
- Blue-tailed Bee-eater
- Blue-tailed Emerald
- Blue-winged Teal
- Blue Jay
- Blue Rock Thrush
- Bluethroat
- Blyth's Hornbill
- Boat-billed Heron
- Bobolink
- Bonaparte's Gull
- Bonelli's Eagle
- Booted Eagle
- Boreal Chickadee
- Brahminy Kite
- Brambling
- Brant Goose
- Brazilian Teal
- Broad-billed Sandpiper
- Bronze-winged Jacana
- Brown-chested Martin
- Brown-headed Barbet
- Brown-headed Cowbird
- Brown-necked Raven
- Brown Noddy
- Brown Pelican
- Bufflehead
- Burnished-buff Tanager
- Bush Stone-curlew