- card sorting
- card stacker
- card storage
- card tray
- card wreck
- cardinal equivalence
- cardinal sum
- careless
- cargo tractor
- carry back
- carry digit
- carry signal
- carry storage
- carry-around
- cartesian
- cartesian coordinates
- Cartesian space
- cartesian square
- cartography
- cartridge
- cartridge drive
- cascade
- cascade control
- cascade entry
- cascade menu
- cascading menu
- case change
- CASE label
- case rack
- case shift
- case statement
- cash receipt
- cashier mode
- cassette
- cassette tape
- cast
- cast operator
- casting
- casting iron
- carriage bolt
- carriage control
- carriage release
- carriage return
- carrier
- carrier amplifier
- carrier band
- carrier beads
- carrier channel
- carrier current
- carrier detect
- carrier frequency
- carrier function
- carrier line
- carrier repeater
- carrier scanner
- carrier sense
- carrier shift
- carrier signal
- carrier signaling
- carrier suppression
- carrier system
- carrier transmission
- carrier wave
- carrier-side
- carry
- carry bit
- carry circuit
- carry flag
- carry indicator
- carrying rail
- Cartesian geometry
- Cartesian product
- cartridge cell
- cartridge font
- carved tape
- cascade amplifier
- cascade carry
- cascade connection
- cascade limiter
- cascade process
- cascaded carry
- cascading choice
- cascading windows
- case independent
- case insensitive
- case sensitivity
- cash register
- casing clutch
- casual analysis
- casual connection
- catalog directory
- catalog record
- catalogue
- catastrophic failure
- category defaults
- catenary
- catenate
- cathode emission
- cathode fall
- cathode resistor