| Acronym | Definition |
|---|
| UDU➣Uma Data Unit |
| UDU➣Unione Degli Universitari (Italian: Union of Universities; various locations) |
| UDU➣Unionist Democratic Union (Tunisia) |
| UDU➣Underwater Demolition Unit |
| UDU➣Union Deutscher Unternehmensberater (German: Union of German Management Consultants) |
| UDU➣Uniformity of Dosage Units |
| UDU➣Upper Deck Uniforms (sports cards) |