- Baglafecht Weaver
- Baillon's Crake
- Baird's Sandpiper
- Bald Eagle
- Baltimore Oriole
- Bananaquit
- Band-tailed Guan
- Banded Barbet
- Banded Woodpecker
- Bar-backed Partridge
- Bar-headed Goose
- Bar-tailed Godwit
- Bar-tailed Lark
- Bar-winged Flycatcher-shrike
- Barbary Partridge
- Bare-faced Ibis
- Bare-throated Tiger Heron
- Barn Swallow
- Barred Antshrike
- Barred Fruiteater
- Bay-breasted Warbler
- Bay-headed Tanager
- Baya Weaver
- Bearded Reedling
- Bearded Vulture
- Beautiful Sunbird
- Berthelot's Pipit
- Bewick's Wren
- Bicolored Conebill
- Bicolored Wren
- Black-and-crimson Oriole
- Black-and-white Mannikin
- Black-and-white Warbler
- Black-bellied Malkoha
- Black-bellied Sandgrouse
- Black-bellied Whistling Duck
- Black-billed Barbet
- Black-billed Nightingale-Thrush
- Black-billed Thrush
- Black-browed Barbet
- Black-capped Chickadee
- Black-capped Donacobius
- Black-capped Kingfisher
- Black-capped Tanager
- Black-capped Vireo
- Black-cheeked Warbler
- Black-cheeked Woodpecker
- Black-chested Jay
- Black-chested Snake Eagle
- Black-chinned Hummingbird
- Black-collared Hawk
- Black-cowled Oriole
- Black-crested Antshrike
- Black-crested Bulbul
- Black-crested Titmouse
- Black-crested Warbler
- Black-crowned Night Heron
- Black-crowned Tchagra
- Black-crowned Tityra
- Black-faced Grassquit
- Black-faced Solitaire
- Black-headed Gull
- Black-headed Lapwing
- Black-headed Tanager
- Black-headed Trogon
- Black-hooded Antshrike
- Black-hooded Oriole
- Black-legged Kittiwake
- Black-naped Monarch
- Black-naped Oriole
- Black-naped Tern
- Black-necked Grebe
- Black-necked Stilt
- Black-striped Sparrow
- Black-tailed Godwit
- Black-throated Blue Warbler
- Black-throated Green Warbler
- Black-throated Grey Warbler
- Black-throated Loon
- Black-throated Sunbird
- Black-whiskered Vireo
- Black-winged Cuckooshrike
- Black-winged Kite
- Black-winged Lovebird
- Black-winged Saltator
- Black-winged Stilt
- Black Crake
- Black Crowned Crane
- Black Drongo
- Black Flowerpiercer
- Black Guan
- Black Guillemot
- Black Heron
- Black Kite
- Black Oystercatcher
- Black Phoebe
- Black Redstart
- Black Skimmer
- Black Stork
- Black Swan
- Black Turnstone
- Black Vulture
- Black Wheatear
- Black Woodpecker
- Blackburnian Warbler
- Blackish-grey Antshrike
- Blackish Nightjar
- Blackpoll Warbler
- Blackstart
- Blue-and-white Swallow
- Blue-backed Manakin
- Blue-bearded Bee-eater
- Blue-black Grassquit
- Blue-capped Tanager
- Blue-chinned Sapphire
- Blue-eared Barbet
- Blue-eared Kingfisher
- Blue-grey Gnatcatcher
- Blue-grey Tanager
- Blue-headed Coucal
- Blue-headed Vireo
- Blue-naped Chlorophonia
- Blue-necked Tanager
- Blue-tailed Bee-eater
- Blue-tailed Emerald
- Blue-winged Goose
- Blue-winged Leafbird
- Blue-winged Minla
- Blue-winged Mountain Tanager
- Blue-winged Teal
- Blue Dacnis
- Blue Grosbeak
- Blue Jay
- Blue Nuthatch
- Blue Rock Thrush
- Blue Whistling Thrush
- Bluethroat
- Blyth's Paradise Flycatcher
- Boat-billed Flycatcher
- Boat-billed Heron
- Boat-tailed Grackle
- Bobolink
- Bohemian Waxwing
- Bonaparte's Gull
- Bonelli's Eagle
- Booted Eagle
- Boreal Owl
- Brahminy Kite
- Brambling
- Brandt's Cormorant
- Brant Goose
- Bridled Quail-Dove
- Bright-rumped Attila
- Broad-billed Motmot
- Broad-billed Sandpiper
- Broad-winged Hawk
- Bronze-winged Jacana
- Bronzy Hermit
- Brown-banded Antpitta
- Brown-chested Martin
- Brown-headed Cowbird
- Brown-headed Gull
- Brown-necked Raven
- Brown-rumped Seedeater
- Brown-throated Martin
- Brown-throated Parakeet
- Brown-throated Sunbird
- Brown-throated Wattle-eye
- Brown Jay
- Brown Pelican
- Brown Shrike
- Brown Thrasher
- Brown Trembler
- Brown Violetear
- Brown Wood Owl
- Bruce's Green Pigeon
- Buff-bellied Warbler
- Buff-breasted Mountain Tanager
- Buff-necked Woodpecker
- Buff-rumped Warbler
- Buff-tailed Coronet
- Buff-throated Saltator
- Buff-vented Bulbul
- Buff-winged Starfrontlet
- Bufflehead
- Buffy Helmetcrest