| Acronym | Sense | Language | Topics |
|---|---|---|---|
| UDC | Universal Decimal Classification = UDK | Universala Dekuma Klasifiko | In Esperanto = CDU | Classification Décimale Universelle | In French = UDC | Universele Decimale Classificatie | In Dutch = CDU | Clasificación Decimal Universal | In Spanish = UDC | Universel Decimal Classifikation | In Danish |
In English | → Libraries |
| UDC | Universele Decimale Classificatie = UDK, CDU (look above) |
In Dutch | → Libraries |
| UDC | Universel Decimal Classifikation = UDK, CDU (look above) |
In Danish | → Libraries |
| UDC | Utility Distribution Center | In English | |
| UDC | Unione dei Democratici Cristiani e di Centro | In Italian | → Christian-democratic parties |