UDN
| Acronym | Definition |
|---|---|
| UDN | União Democrática Nacional (Portuguese: National Democratic Union; Brazilian political group) |
| UDN | Ubiquity Developer Network |
| UDN | University Developers Network |
| UDN | Universal Domain Network |
| UDN | Unreal Developer Network |
| UDN | United Daily News (newspaper; China) |
| UDN | Uganda Debt Network |
| UDN | Unreal Developer Network (Epic Games) |
| UDN | Ubiquity Developer Network (software company community) |
| UDN | Unique Device Name |
| UDN | Unión Democrática Nacionalista |
| UDN | Unintelligent Design Network, Inc. |