CBU
- CBU (AM)
- CBU-FM
- California Baptist University
- Cape Breton University
- Caribbean Broadcasting Union
- Celal Bayar University
- Christian Brothers University
- Chungbuk National University
- Cluster bomb
- Cluster box unit
- Cognition and Brain Sciences Unit
- Community Bank System, Inc.
- Copperbelt University
- Cottbus-Drewitz Airport
- Knock-down kit