| Acronym | Definition |
|---|
| UCN | Ultimate Custom Night (game) |
| UCN | Universidad Católica del Norte (Chile) |
| UCN | University College of the North (The Pas, Manitoba, Candad) |
| UCN | University College Northampton (UK) |
| UCN | United Colonial Nations (Killzone) |
| UCN | Unión del Centro Nacional (Union of the National Center; political party, Guatemala) |
| UCN | University College of Northern Denmark (Aalborg, Denmark) |
| UCN | Ultra Cold Neutron |
| UCN | Unión del Cambio Nacional (Spanish; Guatemala) |
| UCN | Unidad del Cambio Nacionalista (Spanish) |
| UCN | Unique Control Number |
| UCN | User Circuit Number |
| UCN | Universal Control Number |
| UCN | United Carrier Network, Inc. |
| UCN | Unidentified Cover Name (espionage) |
| UCN | Únase Con Nosotros (Guatemala, political party) |
| UCN | Uniform Calendar for any New Calendar Era Date (ICAS) |
| UCN | Unique Candidate Number (UK) |