| NAIS | NASA Acquisition Internet Service 
| Others |
| NAIS | National Agricultural Insurance Scheme
| Others |
| NAIS | National Animal Identification System
| Others |
| NAIS | National Association of Independent Schools
| Others |
| NAIS | National Association of insurance Service
| Others |
| NAIS | National Association Of Investigative Specialists
| Others |
| NAIS | Nationwide Automatic Identification System
| Others |
| NAIS | Native American and Indigenous Studies
| Others |
| NAIS | Nazareth Area Intermediate School
| Others |
| NAIS | Needs Assessment And Implementation Study
| Others |
| NAIS | Next Generation Active Integrated Optic Subsystems
| Others |
| NAIS | Nord Anglia International School
| Others |
| NAIS | North American IPv6 Summit
| Others |