| Acronym | Definition |
|---|
| NAIS | National Association of Independent Schools |
| NAIS | National Animal Identification System (United States) |
| NAIS | Next Generation Active Integrated Optic Subsystems |
| NAIS | National Association of Investigative Specialists |
| NAIS | NASA Acquisition Internet Service |
| NAIS | National Agricultural Insurance Scheme (India) |
| NAIS | National Atlas Information Service |
| NAIS | Nothing As It Seems (Pearl Jam song) |
| NAIS | Norwegian Aeronautical Information System |
| NAIS | Norwegian Artificial Intelligence Society |
| NAIS | National Automated Identification System (US Coast Guard) |
| NAIS | National Association for Information Services (Washington, DC) |
| NAIS | Navy Attitudinal Information System |
| NAIS | News Analysts in International Security |