- ballast section
- ballast shoulder
- ballast tamper
- ballast tank
- ballast train
- ballastless track
- bank
- bank account
- base fracture
- base line
- batten
- battery truck
- beam knee
- banking
- bar
- bar coach
- barometric switch
- barostat
- barrier arm
- barrier machine
- bearing rail
- bearing sleave
- bearing surface
- bearing wedge
- becket bend
- bell communication
- belly
- belly landing
- below
- below deck
- bare fuselage
- bare hull
- bareboat charter
- barge
- barge carrier
- barge container
- barrel buoy
- barrier
- barrier light
- base plate
- base volume
- basin
- batten down
- batten pocket
- batter
- battery bus
- battery charger
- battle cruiser
- baud rate
- bay platform
- battery box
- bay
- beaching keel
- beam
- beam interception
- beam sea
- bear away
- bear down
- beaufort scale
- belaying cleat
- bench mark
- bench wall
- bend
- bends
- bent
- berm
- Berne key
- Berne rectangle
- between deck
- betweendecks
- Beugniot bogie
- bifurcation
- bight
- bilge
- bilge plate
- bilge plating
- bilge strake
- bilge stringer
- bill payable
- big wheel
- bilge blower
- bilge keel
- bilge pump
- bilge shore
- bilge water
- bill receivable
- binocular rivalry
- blade stall
- blanking effect
- blanking plate
- bitter end
- bitts
- blank endorsement
- block section
- blockade
- blocking signal
- bluff
- blind angle
- blind axle
- blind flight