| Abbreviation | Definition |
|---|---|
| NCLIS | National Commission on Libraries and Information Science |
| NCMEC | National Center for Missing and Exploited Children |
| NCND | Neither Confirming Nor Denying |
| NCOIC | Non Commissioned Officer In Charge |
| NCP | National Car Parks |
| NCP | National Competition Policy |
| NCP | Netware Core Protocol |
| NCPC | National Capital Planning Commission |
| NCPDCID | National Center for Preparedness, Detection, and Control of Infectious Disease |
| NCPS | National Cybersecurity Protection System |
| NCR | No Country Required |
| NCR | Non Conformance Reports |
| NCRC | National Capital Region Coordination |
| NCRP | National Committee on Radiation Protection |
| NCRPM | National Council of Radiation Protection and Measurement |
| NCSC | National Care Standards Commission |
| NCSC | National Customer Support Center |
| NCSD | National Cyber Security Division |
| NCSD | Nuclear Criticality Safety Division |
| NCSL | National Council of Standard Laboratories |