UDC may stand for:
- Unió Democràtica de Catalunya, the Democratic Union of Catalonia (see also: Politics of Spain)
- Union Démocratique du Centre, the Swiss People's Party (see also: Politics of Switzerland)
- Union du Centre, French for Union of the Center (see also: Politics of France)
- Universal Decimal Classification
- Universidade da Coruña, the University of A Coruña