| Abbreviation | Definition |
|---|---|
| NHPP | National Historical Park and Preserve |
| NHPRC | National Historical Publications and Records Commission |
| NHQ | National Housing Quality |
| NHRC | National Health Research Center |
| NHS | National Health System |
| NHSC | National Health Service Corps |
| NI | National Income |
| NI | Native Indian |
| NI | New Issue |
| NI | Not Important |
| NIAC | National Initiatives And Collaboration |
| NIAC | Nuclear Industry Assessment Committee |
| NIACAP | National Information Assurance Certification and Accreditation Process |
| NIAID | National Institute for Allergy and Infectious Diseases |
| NIAMS | nal Institute of Arthritis and Musculoskeletal and Skin Diseases |
| NIBSC | National Institute for Biological Standards and Control |
| NIC | National Identity Card |
| NIC | National Influenza Center |
| NIC | National Institute of Corrections |
| NICD | National Institute Of Common Diseases |