NSIA
| Acronym | Definition |
|---|---|
| NSIA | National Security Industrial Association |
| NSIA | Northwest Sportfishing Industry Association |
| NSIA | Nebraska Society of Independent Accountants (est. 1980) |
| NSIA | National Snow Industries Association |
| NSIA | Network Security and Information Assurance |
| NSIA | National Security and Intelligence Agency (Namibia) |
| NSIA | Nevada Self Insurers Association |