CDC
- California Department of Corrections
- Canadian Dairy Commission
- Career Development Course
- Centers for Disease Control and Prevention
- Child Development Center
- Citizens Development Corps
- Climate Diagnostics Center of the National Oceanic and Atmospheric Administration (NOAA) of the U.S. Department of Commerce
- Control Data Corporation
- Council for Disabled Children
- Connected Device Configuration
- Cul De Canard
- Cult of the Dead Cow
- Democratic Convergence of Catalonia