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- Boche
- Body snatcher
- Bogey
- Bois-le-Prêtre
- Bolimov
- Bollicky
- Bolo
- Bolo house
- Bomb-dodger
- Bomb-proofer
- Bombard
- Bombarded
- Bombardier (rank)
- Bombardier Fritz
- Bombardment
- Bomber
- Bombing the chat
- Bon drop
- Bon for the bust
- Bon sonty
- Bona (Algeria)
- Bonfire
- Bongo boosh
- Bonza
- Boob
- Booby hutch
- Booby trap
- Booka
- Bookri
- Books
- Boost
- Bootneck
- Booty men
- Bosky
- Bosom chums
- Bothaville
- Bougainville
- Bounce
- Boureuilles
- Bow Bells
- Box
- Box barrage
- Box respirator
- Boy Scouts
- Boys in blue
- Brads
- Brahma
- Brass hat
- Brass neck
- Brass off
- Breezer
- Breezy
- Brief
- Brigade
- Brigade, 97th
- Brigadier
- Brigadier (rank)
- Brigadier General (rank)
- British Expeditionary Force
- British Official
- British Red Cross Enquiry Department
- British War Aims
- British warm
- Brock's benefit
- Brodie helmet
- Brody
- Broody
- Bruges
- Brussels
- Brzezany
- Bubbly
- Buck
- Buckshee
- Buckshee King
- Buddy
- Budget
- Budmash
- Buff stick
- Buggly
- Bukovina
- Bulgaria
- Bullecourt
- Bullecourt (Cambrai)
- Bullet
- Bullet with a name on it
- Bullock
- Bully beef
- Bull’s Eye
- Bultfontein
- Bummer
- Bumming the chat
- Bun strangler
- Bun wallah
- Bunce
- Bundabust
- Bundle-man
- Bundle of ten
- Bunerwals
- Bung
- Bunjee
- Bunker plate with spanner
- Bunkey boo
- Bunting tosser
- Burbury
- Burglars
- Burgoo
- Burney gear
- Burnt cinders
- Burnt offering
- Bus
- Business
- Butt-notcher
- Butt in
- Butterfly boat
- Button loose
- Buzz
- Buzz off
- Buzz to
- Buzzer
- Buzznagger
- Bzura (river)
- C3
- CB
- CIV
- CMAR
- CMB
- CO
- COD
- Cadet
- Cady
- Cag
- Cagnas
- Cain and Abel (rhyming slang)
- Cake walk
- Calm-Laylas
- Calvinia
- Camel-Wallah
- Camelier
- Cameroons
- Camouflage
- Camp-followers
- Camp des Romains
- Canada
- Canard
- Canary
- Canned up
- Cannon fodder
- Canteen eggs
- Canteen medal
- Canteen stinker
- Canuck
- Cap badge
- Cape Helles
- Cape of Good Hope (rhyming slang)
- Capitulation
- Caprete
- Captain
- Captain (rank)
- Carfindo
- Carl the caretaker's in charge
- Carney
- Carpathian Mountains
- Carpathians
- Carry on
- Cart
- Cartel
- Carving knife (rhyming slang)
- Casabianc
- Cashed in
- Castor oil artist
- Cat stabber
- Category man
- Caterpillar
- Catsood
- Cattaro
- Caucasus
- Caucasus Mountains
- Caudry-Le Cateau line
- Caulk
- Cavalry
- Ceiling
- Cells
- Centimes
- Central Flying School
- Central Powers
- Centre of Information
- Ceylon Planters' Rifle Corps
- Challenge ships
- Champagne
- Chance one's arm
- Chancer
- Char
- Char D'assaut
- Charleroi (Belgium)
- Charles W. H. Douglas
- Charley
- Charley Pope
- Charlie Noble
- Charming wife
- Chartorysk
- Chartorysk (Volhynia)
- Chat
- Chatham rats
- Chatty
- Chatty but happy
- Check
- Cheerio!
- Cheese it
- Chemozzle
- Chenstokhov (Poland)
- Cherry nobs
- Chestnuts
- Chew the fat
- Chicot
- Chin wag
- Chinese Rolls Royce
- Chinese attack
- Chink
- Chinny
- Chip in
- Chippy chap
- Chips
- Chit
- Choker
- Chokey
- Chow up
- Christiaan Beyers
- Christiaan de Wet
- Christian Beyers
- Christians arise
- Christopher Cradock
- Chronology of the War
- Chuck
- Chuck a dummy
- Chuck one's hand in
- Chuck one's weight about
- Chuck up
- Chummy ship
- Chuprow
- Church-by-hand
- Châlons
- Cinch
- Cinema
- Cirey (France)
- Civvies
- Civvy kip
- Clack
- Clacker
- Clean and polish – We're winning the war
- Clean as a button stick
- Click
- Clickety click
- Client
- Clink
- Clinker
- Clobber
- Clod
- Clods
- Clout
- Coal box
- Coal heaver
- Cockpit
- Code
- Coffee cooler
- Coffin nail
- Coggage
- Coil up one's ropes
- Colco-Pari
- Cold feet
- Cold meat ticket
- Colonel
- Colonel (rank)
- Colour Sergeant (rank)
- Colours, Bayonets and Drums in the City of London
- Column of Route
- Combatant
- Come a gutzer
- Come it
- Come the double
- Comic business
- Comic cuts
- Coming the acid
- Commandant
- Commandeer
- Commander
- Commissariat
- Commissie Drift
- Commission
- Commo
- Commodore
- Commonwealth
- Commonwealth War Graves Commission
- Commonwealth of Nations
- Communes of France
- Community Portal
- Company
- Company (military unit)
- Company Quartermaster Sergeant (rank)
- Company Sergeant Major (rank)
- Compiègne
- Compree
- Comrades of the mist
- Conchy
- Conk out
- Consolidate
- Conspicuous Gallantry Cross
- Consul
- Contour chasing
- Contraband of War
- Convalesce
- Cook's tour
- Cook of the grot
- Cooker
- Cookhouse official
- Coop
- Coopetty coop
- Cooshy
- Cooter Goosht
- Coots, cooty
- Copenhagen
- Coppa dah
- Corned dog
- Corporal
- Corporal (rank)
- Corps (Army)
- Corpse ticket
- Cosh
- Coughing Clara
- Coulommiers
- Council of War
- Count Bernstorff
- Couple o' doorsteps
- Courrier de L'air
- Cow climbed up a hill
- Cow feed
- Crab
- Crab grenade
- Cracow
- Cramp one's style
- Craonne
- Crappo
- Crash
- Crash dive
- Crawl
- Crawling on one's eyebrows