NC
- nC – (s) Nanocoulomb
- NC
- (i) Network Computer
- (s) New Caledonia (ISO 3166 digram)
- (i) Node Centre
- Non-Consensual
- Normally Closed
- (s) North Carolina (postal symbol)
- NCA – (i) National Command Authority
- NC3A or NC3A – (i) NATO Consultation, Command and Control Agency
- NCAA – (i) National Collegiate Athletic Association ("NC double A")
- NCAR – (i) U.S. National Center for Atmospheric Research
- NCB – (i) National Codification Bureau
- NCCAM – (i) U.S. National Center for Complementary and Alternative Medicine
- NCCUSL – (i) National Conference of Commissioners on Uniform State Laws (U.S.)
- NCDDR – (i) U.S. National Center for the Dissemination of Disability Research
- NCES
- (i) U.S. National Center for Education Statistics
- Net-Centric Enterprise Services
- NCI – (i) U.S. National Cancer Institute
- NCIS
- (i) National Criminal Intelligence Service (British)
- Naval Criminal Investigative Service (U.S. Navy; see also NCIS, a U.S. TV series based on this unit)
- NCL – (s) New Caledonia (ISO 3166 trigram)
- NCLR – (i) National Council of La Raza
- NCMO – (i) No Commitment Make Out
- NCND
- (i) Non Circumvention & Non Disclosure
- (i) Neither Confirm Nor Deny
- (i) New Concept New Design
- NCO – (i) Non-Commissioned Officer
- NCP – (i) Net Contracted Purchases
- NCR – (i) National Cash Register Co.
- NCTR – (i) Non-Co-operative Target Recognition
- NCW – (i) Network Centric Warfare
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