| Acronym | Meaning |
| UDC | Cameroonian Democratic Union |
| UDC | Un-reimbursed Development Cost |
| UDC | Unclassified Document Control |
| UDC | Under-Developed Country |
| UDC | Uniao Democrata-Crista de Timor (Christian Democratic Union of Timor) |
| UDC | Unified Development Code |
| UDC | Uniform Definition of a Child (tax law) |
| UDC | Uniform Distribution Center (Us Coast Guard Unit) |
| UDC | Unió Democrática de Catalunya (Democratic Union of Catalonia, Spain) |
| UDC | Union Democratique du Centre (Swiss People's Party) |
| UDC | Union Des Comores (French: Union of the Comoros) |
| UDC | Unit Deployment Center |
| UDC | Unit Descriptor Code (US DoD) |
| UDC | Unit Disciplinary Committee (Federal Bureau of Prisons) |
| UDC | Uniun Democratica Dal Center (Swiss People's Party) |
| UDC | Unlawful Discrimination Claim (IRS code) |
| UDC | Urban Design Committee (various organizations) |
| UDC | Urban District Council (UK) |
| UDC | USACE (United States Army Corps of Engineers) Deployment Center |
| UDC | User Defined Collection |
| UDC | User Designation Code |
| UDC | User Determined Connection (gun slings) |
| UDC | Utah Department of Corrections |