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- bismuth
- bison
- bissau
- bit
- bit-map
- bithynia
- bittern
- bitterroot range
- bittersweet
- bitumen
- bituminous coal
- bivalve
- black aesthetic movement
- black and tan
- black bass
- black bear
- black codes
- black death
- black forest
- black friday
- black gum
- black hand
- black hills
- black hole
- black humour
- black legend
- black letter
- black market
- black nationalism
- black panther party (for self-defense)
- black pepper
- black sand
- black sea
- black snake
- black sox scandal
- black stone of mecca
- black theatre
- black warrior river
- black widow
- black-eyed susan
- black-figure pottery
- blackberry
- blackbird
- blackbody
- blackcap
- blackfly
- blackfoot
- blackjack
- blackpoll warbler
- blackshirts
- bladder cancer
- bladderwort
- blanc, mont
- blank verse
- blarney
- blast furnace
- blaue reiter, der
- bleach
- bleeding heart
- bleeding kansas
- blenheim palace
- blenheim, battle of
- blenny
- blessingway
- blight
- blind fish
- blindness
- blister
- blister beetle
- blister rust
- blitzkrieg
- bloc national
- block and tackle
- block mill
- blockade
- blood
- blood analysis
- blood bank
- blood pressure
- blood transfusion
- blood typing
- bloodhound
- bloodroot
- bloody sunday
- bloomery process
- bloomsbury group
- blow, john
- blowfly
- blowgun
- blowing engine
- blue (butterfly)
- blue crab
- blue law
- blue mountains
- blue ridge
- blue whale
- bluebell
- blueberry
- bluebird
- bluebonnet