- compressor stall
- compressor stator
- compass error
- compass heading
- complete diversion
- composite aircraft
- concrete scrap
- condensation trail
- confused sea
- concourse
- concrete scraper
- conductor rail
- confluence
- confusion cone
- conical buoy
- commuter traffic
- connecting shaft
- connecting train
- conning tower
- conflict point
- console
- construction yard
- contact rail
- container berth
- container station
- container terminal
- container truck
- containerize
- contact detector
- contact point
- container capsule
- container wharf
- continuous curve
- continuous tuning
- continuous yarn
- continuum
- control console
- control size
- control system
- control unit
- controlled dumping
- contour effect
- contour follower
- control diaphragm
- control task
- conveyor
- continuous tuner
- control potentiometer
- control routine
- control sequence
- control signal
- control surface
- control technology
- conventional cut
- convoy
- cooling flap
- control tape
- conversion machinery
- conveying plant
- cordy
- corridor control
- counter stern
- counterflooding
- counting station
- coupleable
- coupling buffer
- coupling hook
- course
- course selector
- course tracer
- courtesy flag
- covered container
- cowling
- counter
- course angle
- courtesy ensign
- covered car
- covered wagon
- covering board
- crab angle
- cradle
- crank
- crank handle
- cracked web
- crash
- crate pallet
- crater
- credit note
- creditor
- creek
- creep
- creosote
- crew list
- critical altitude
- cropped end
- cropping
- cruise ship
- crushed head
- cross level
- cross tie