CDU
- Acute medical unit
- Cam and Dursley railway station
- Camden Airport (New South Wales)
- Cameroon Democratic Union
- Caribbean Democrat Union
- Catholic Distance University
- Cebu Doctors' University
- CentrumDemokraternes Ungdom
- Charles Darwin University
- Charles R. Drew University of Medicine and Science
- Chengdu University
- Christian Democratic Union (East Germany)
- Christian Democratic Union (Netherlands)
- Christian Democratic Union (Ukraine)
- Christian Democratic Union of Germany
- Control display unit
- Counter display unit
- Country Development Unit
- Croatian Democratic Union
- Oil refinery
- Unitary Democratic Coalition
- United Christian Democrats
- United Democratic Centre (El Salvador)