| 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) |