| 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 |