- Burning mountain
- Burnt
- Burnt rice
- Burst
- Bury the hatchet
- Burying ground
- Bus speed
- Bush-tree
- Bushel
- Business hours
- Business plan
- Bust
- But most importantly
- Butcher
- Butt hole
- Butt out
- Butter milk and water mix
- Butterfingers
- Buttery
- Butthurt
- Buttock
- Button onion
- Buy a pig in a poke
- Buzzword
- Buzzworthy
- By any manner
- By hook or crook
- By land
- By name
- By virtue of
- By-taste
- Bylaw
- Byte
- Behoof
- Besought
- Bcc
- Bakula
- Baneful
- Bovarism
- Bullring
- Bur
- Bidet spray
- Bifurcate
- Big bang
- Big name
- Big pot
- Big shot
- Bigamy
- Bilabial
- Bile duct
- Bilge
- Biliary
- Bilirubin
- Billet dou
- Biltong
- Bimonthly
- Bind
- Binder
- Binocular
- Bint
- Biochemical
- Biodata
- Biofertilizer
- Biographer
- Biological clock
- Biota
- Bipedalism
- Bipolar
- Bird
- Bird of passage
- Bird-chief garuda
- Bobbitise
- Birthright revolution
- Birthstone
- Bis
- Bisam
- Bishop
- Bison
- Bit
- Bite
- Bites
- Bits
- Bitter-ground plant
- Bituminize
- Blabber
- Black aloe-wood
- Black basil
- Black buck
- Black centimony
- Black eye
- Black flax seed
- Blackleg
- Black magic
- Black money
- Black panther
- Black pomfret
- Black sea
- Black spot
- Black-fish
- Blackcumin