- Clement
- Cleromancy
- Clever feat
- Close with
- Close-knit
- Closeted
- Closing
- Closing the eyes
- Closure
- Clothes
- Clothesline
- Clothing
- Cloud nine
- Cmos
- Co-education
- Co-heir
- Co-opt
- Co-respondent
- Co-star
- Co-worker
- Coach
- Coach load
- Coagulate
- Coalgate
- Cockalarum
- Cockscomb
- Cocksure
- Cocktail
- Coco
- Coconut
- Cocopeat
- Coddle
- Code
- Cold storage
- Cold war
- Cold-blooded
- Cold-hearted
- Coleslaw
- Coliform
- Coliseum
- Colitis
- Collaboratively
- Collage
- Collapse
- Collapsible
- Collar beam
- Collectedly
- Colon
- Colonial
- Colonialism
- Colonization
- Colonize
- Colophon
- Colophony
- Colorectal
- Colour bar
- Colour printing
- Colouring
- Colt
- Come to the surface
- Come together
- Come under
- Comely
- Comemorated
- Comet
- Comfort station
- Comical
- Comilona
- Commissary
- Commission
- Commissioned officer
- Commit suicide
- Committal
- Commix
- Commodification
- Commodore
- Common ground
- Compiling
- Complacence
- Complete eradication
- Complete figure
- Completed
- Completeness
- Completion
- Complex
- Complexion
- Complexity
- Compliance
- Compliant
- Compressed air
- Comprising
- Compunction
- Compute
- Computer graphics
- Comrade
- Comsat
- Con man
- Concatenate
- Concatenation
- Concede