CU, Cu, or cu may refer to:

  • Copper, a chemical element
  • The ISO 639-1 code for Old Church Slavonic
  • The cu (=call unix) remote login command used on unix-like computing systems
  • "See you" in e-mail shorthand
  • The Latin abbreviation for colitis ulcerosa, an inflammatory bowel disease (IBD).

In mathematics, science and medicine:

  • Control unit (disambiguation)
  • CU (Powerline), an HVDC-powerline in the USA
  • Cube/cubic in a variety of English Imperial units and United States customary units (cubic inch, cubic foot, etc.).
  • Cumulus clouds
  • Cellulase Unit
  • Callous and unemotional traits

Referencing a place:

  • .cu, Cuba's top-level domain country code
  • Old Church Slavonic: ISO 639 alpha-2 language code
  • Cuba, ISO 3166, FIPS Pub 10-4 and obsolete NATO digram

In film making:

  • Close-up

As a company or organization:

  • ChristianUnion, a political party in the Netherlands
  • Consumers Union
  • Credit union
  • Cubana, an IATA airline designator
  • Christian Union (students), a university or college student Christian group

As a university:

  • Chittagong University
  • Carleton University, Ottawa
  • Concordia University (Montreal)
Czech Republic
  • Charles University, Prague
  • Cairo University
  • Catholic University of Eichstätt-Ingolstadt
Hong Kong
  • Chinese University of Hong Kong
  • University of Calcutta
  • Covenant University
  • Chulalongkorn University
United Kingdom
  • Cardiff University
  • Cranfield University
  • Coventry University
  • University of Cambridge
United States
  • Cameron University (US)
  • Cedarville University (US)
  • Chapman University (US)
  • Clarkson University (US)
  • Clemson University (US)
  • Colgate University (US)
  • Columbia University (US)
  • Cornell University (US)
  • Cornerstone University (US)
  • Creighton University (US)
  • University of Colorado at Boulder (US)
  • University of Colorado system (US)