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CU or cu may refer to:
- CheckUser, a security feature of the wiki
- Close-up, in film making
- Cuba (ISO 3166, FIPS Pub 10-4 and obsolete NATO digram)
- .cu, Cuba's top-level domain country code
- Old Church Slavonic (ISO 639 alpha-2 language code)
- "See you", in e-mail shorthand
- Civil union, type of legal partnership
- Cubit, ancient unit of length