| Abbreviation | Definition |
|---|---|
| NI | Noted Item |
| NIAF | National Iraqi Armed Forces |
| NIAG | NATO Industrial Advisory Group |
| NIB | Newly Inducted Brother |
| NIBRS | National Incident-Based Reporting System |
| NIC | National Intelligence Community |
| NIC | Naval Intelligence Center |
| NI-CAD | Nickel Cadmium |
| NICCP | National Interdiction Command and Control Plan |
| NICI | National Intellectual Capital Index |
| NICI | National Interagency Counternarcotics Institute |
| NICOP | Naval International Cooperative Opportunities in Science and Technology Program |
| NICP | National Inventory Control Point |
| NICS | NATO Integrated Communications System |
| NICS | Neurological Impulse Combat System |
| NID | Naval Intelligence Database |
| NIDMS | National Military Command System (NMCS) Information For Decision Makers System |
| NIDS | NMCC (National Military Command Center) Information Display System |
| NIES | Non -material Individual Enhancement of SOF operations |
| NIES | Non-material Individual Enhancement of SOF (Special Operations Forces) operations |