- Bald Eagle
- Balearic Shearwater
- Baltimore Oriole
- Bar-headed Goose
- Bar-tailed Godwit
- Barn Swallow
- Barnacle Goose
- Barred Owl
- Bearded Reedling
- Belted Kingfisher
- Black-and-white Warbler
- Black-capped Chickadee
- Black-crowned Night Heron
- Black-headed Gull
- Black-legged Kittiwake
- Black-necked Grebe
- Black-tailed Godwit
- Black-throated Blue Warbler
- Black-throated Green Warbler
- Black-winged Stilt
- Black Kite
- Black Redstart
- Black Stork
- Black Swan
- Black Tern
- Blackpoll Warbler
- Blue-headed Vireo
- Blue-winged Teal
- Blue Jay
- Bluethroat
- Bobolink
- Bohemian Waxwing
- Bonelli's Eagle
- Booted Eagle
- Boreal Owl
- Brambling
- Broad-winged Hawk
- Brown Creeper
- Brown Noddy
- Brown Thrasher
- Buff-bellied Pipit
- Buff-breasted Sandpiper