UDB
- Belgian Democratic Union
- Bolivian Democratic Union
- Breton Democratic Union
- DEC Multia
- Dakar Bourguiba University
- Doom (1993 video game)
- IBM Db2
- List of universities in El Salvador
- T9 (predictive text)
- Time travel debugging
- UDBA
- Uganda Development Bank Limited
- Undo (company)
- Unión del Barrio
- Urban Bank