- aye, aye, sir
- aylet
- ayont
- ayr
- ayt
- azimuth
- azimuthal error
- azimuth circles
- azimuth compass
- azogue
- azogues
- azumbre
- azure
- baard
- baare-y-lane
- baas
- bab
- babbing
- babbling
- bac
- bacallao
- bacchi
- back
- back, of a ship
- back of the post
- back-board
- back-cutting
- back-frame
- back-her
- backing
- back-o'-beyond
- back off all
- back-rope
- backs
- back-staff
- backstay-plates
- backstays
- backstay-stools
- backsters
- back-strapped
- back-sweep
- back-water
- bacon, to save
- bad-berth
- badderlock
- baddock
- badge
- badge, seaman's
- badger, to
- badger-bag
- bad-name
- bad-relief
- baessy
- baffling
- bag
- bag, of the head-rails
- bag, the
- bagala
- bag and baggage
- baggage
- baggage-guard
- baggety
- baggonet
- bagnio
- bagpipe
- bag-reef
- bagrel
- baguio
- bahar
- baidar
- baikie
- baiky
- bail
- bail-bond
- bail'd
- bailo
- bailes
- bails
- baiocco
- bairlinn
- bait
- baitland
- balæna
- balance
- balance, to
- balance-fish
- balance-frames
- balance of trade
- balance-reef
- balancing-point
- balandra
- balanus
- balcar
- balcony
- baldrick
- bale
- bale, to
- baleen
- bale goods
- balenot