- Baird's Sandpiper
- Balearic Shearwater
- Bananaquit
- Bar-headed Goose
- Bar-tailed Godwit
- Bare-faced Ground Dove
- Barn Swallow
- Barnacle Goose
- Bearded Reedling
- Belcher's Gull
- Black-crowned Night Heron
- Black-headed Gull
- Black-legged Kittiwake
- Black-necked Grebe
- Black-necked Stilt
- Black-tailed Godwit
- Black-winged Kite
- Black-winged Stilt
- Black Kite
- Black Redstart
- Black Stork
- Black Swan
- Black Tern
- Black Vulture
- Blackish Oystercatcher
- Blue-grey Tanager
- Blue-winged Mountain Tanager
- Bluethroat
- Bonelli's Eagle
- Booted Eagle
- Brambling
- Bush Stone-curlew