| Acronym | Definition |
|---|
| NISS➣NSG (Nuclear Suppliers Group) Information Sharing System |
| NISS➣National Intelligence and Security Service (Sudan) |
| NISS➣National Institute of Statistical Sciences |
| NISS➣National Institute for Strategic Studies (various locations) |
| NISS➣National Information Services and Systems (UK) |
| NISS➣New ICMI Study Series (International Commission on Mathematical Instruction) |
| NISS➣National Independent Statistical Service |
| NISS➣Numéro d'Identification Sécurité Sociale (Belgian Social Security Identification Number) |
| NISS➣National ITV Satellite Schedule |
| NISS➣Network and Information Security Services |
| NISS➣National Industrial Security System (Department of Defense) |
| NISS➣National Institute of Space Sciences |
| NISS➣Nuclear Information Suppliers System |
| NISS➣Node-Inclusive Span Survivability |
| NISS➣Nonimmigrant Information System |