UCN may stand for:
- National Civic Union (Bolivia), a political party
- Ultracold neutrons
- Genes in the human urocortin family
- UCN, the IATA Airport Code for Buchanan Airport
- Ultimate Custom Night, a survival horror video game
- Universal character name, a feature of C99 (and later versions).
Education
- Central University of Nicaragua, a private and nonprofit university, Nicaragua
- Universidad Católica del Norte, a university in Antofagasta, Chile
- University College of the North, a university college in Manitoba, Canada
- University College of Northern Denmark, a university in Denmark
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