CLF
- CenturyLink Field
- Chain link fence
- Chlorine monofluoride
- Church of the Larger Fellowship
- Clear Sky Lodge Airport
- Cleveland-Cliffs Inc.
- Clifton Forge (Amtrak station)
- Common Log Format
- Common Look and Feel
- Commonwealth Literary Fund
- Congressional Leadership Fund
- Conservation Law Foundation
- Johns Hopkins Center for a Livable Future
- RAF Coltishall
- Unidad de Fomento