- Citizen
- Citroen
- City
- Citybag
- Civic
- Claas
- Clarion
- Clarion collection
- Class
- Clean
- Clear
- Climate change
- Clothing
- Cls
- Club
- Clutch
- Cms
- Cnc
- Co2
- Coach
- Coaching
- Coates
- Cobra
- Coe
- Coffee
- Cognac
- Coil
- Collagen
- Collections
- Color line
- Com
- Combo
- Comelit
- Comfort
- Commercial
- Commercial banking
- Communication
- Community
- Company
- Company portrait
- Competition
- Compliance
- Condis
- Condis stovner
- Condis økern
- Conditori
- Conecto
- Connectors
- Consulting
- Consulting firm
- Contact
- Container
- Containere
- Containers
- Containerutleie
- Contemporary art
- Content management system
- Contract
- Control
- Controlsystem
- Converter
- Coolpix
- Coop
- Cooper
- Cop
- Copenhagen