| CDU | Cab Drivers United 
| Others |
| CDU | Cabinet Distribution Unit
| Others |
| CDU | Cardiac diagnostic unit
| Others |
| CDU | Catholic Distance University
| Others |
| CDU | Central Delivery Unit
| Others |
| CDU | Central Detention Unit
| Others |
| CDU | Central Display Unit
| Others |
| CDU | Charge Down Up
| Others |
| CDU | Charles Darwin University
| Others |
| CDU | Chart Display Unit
| Others |
| CDU | Chemical Dispensing Unit
| Others |
| CDU | Child Development Unit
| Others |
| CDU | Christian Democrat Union
| Others |
| CDU | Christian Democratic Union
| Others |
| CDU | Christian Democratic Unions
| Others |
| CDU | Christlich Demokratische Union
| Others |
| CDU | Christlich-Demokratische Union
| Others |
| CDU | Christlich-Demokratische Union (Christian Democratic Union)
| Others |
| CDU | Clinical decision unit
| Others |
| CDU | Club deutscher Unternehmer
| Others |
| CDU | colour Doppler ultrasonography
| Others |
| CDU | Colourflow Duplex Ultrasound
| Others |
| CDU | Commander's Display Unit
| Others |
| CDU | Communicable Diseases Unit
| Others |
| CDU | Compact Disc Unit
| Others |
| CDU | Complete Dependence Unit
| Others |
| CDU | Computer Display Unit
| Others |
| CDU | Condition Desirability Utilities
| Others |
| CDU | Conduct and Discipline Unit
| Others |
| CDU | Connectix Desktop Utilities
| Others |
| CDU | Content, Design, and Usability
| Others |
| CDU | Continuing Development Unit
| Others |
| CDU | Control Display Unit
| Others |
| CDU | Coolant Distribution Unit
| Others |
| CDU | Coolant Distribution Units
| Others |
| CDU | Corporate Development Unit
| Others |
| CDU | Cos Delivery Unit
| Others |
| CDU | Counter-Drug Update
| Others |
| CDU | Coupling Data Unit
| Others |
| CDU | Coupling Display Unit
| Others |
| CDU | CRT (Cathode Ray Tube) Display Unit
| Others |
| CDU | Crude Distillation Unit
| Others |
| CDU | Crushing Duke University
| Others |
| CDU | Customer Data Unit
| Others |
| CDU | Cyber Defense Unit
| Others |