| Acronym | Definition |
|---|
| NISA | Nuclear and Industrial Safety Agency (Japan) |
| NISA | Net Income Stabilization Account (Canadian farm aid program) |
| NISA | Nippon Individual Savings Account (Japan) |
| NISA | National Invasive Species Act of 1996 |
| NISA | Network Integrated Systems Architecture (HBD) |
| NISA | National Information Society Agency (South Korea) |
| NISA | National Industrial Sand Association |
| NISA | Network Infrastructure Services Agency (US DoD; formerly Single Agency Manager) |
| NISA | Negocios Informáticos SA (Buenos Aires, Argentina) |
| NISA | Northern Independent Supermarket Association (UK) |
| NISA | National Independent Supermarket Association (UK) |
| NISA | National Intelligence & Security Agency (Philippines) |