NISI
| Acronym | Definition |
|---|---|
| NISI | Ninety Six National Historic Site (US National Park Service) |
| NISI | National Industry Skills Initiative (Australia) |
| NISI | Northwest Information Systems, Inc. (Kirkland, WA) |
| NISI | National Investment Services, Inc. (Chicago, IL) |
| NISI | Native Inspection Services Initiative (Canada Mortgage and Housing Corp.) |
| NISI | Network and Information System Integration |