| NISS | Nacel International School System 
| Others |
| NISS | National Information Services And Systems
| Others |
| NISS | National Information Sharing Standards
| Others |
| NISS | National Institute of Statistical Sciences
| Others |
| NISS | National Intelligence and Security Service
| Others |
| NISS | National Intelligence and Security Services
| Others |
| NISS | New Icmi Study Series
| Others |
| NISS | New Injury Severity Score
| Others |
| NISS | New Item Submission System
| Others |
| NISS | Nexus International School Singapore
| Others |
| NISS | Niseko International Snowsports School
| Others |
| NISS | Nissan Intelligent Safety Shield
| Others |
| NISS | Nordic Institute of Stage and Studio
| Others |
| NISS | North India Solar Summit
| Others |
| NISS | North Island Secondary School
| Others |
| NISS | Norwegian Institute For Scene And Scene
| Others |