| Acronym | Definition |
|---|
| INSA | Institut National des Sciences Appliquées (French: National Institute of Applied Sciences) |
| INSA | Indian National Science Academy |
| INSA | Intelligence and National Security Alliance (Arlington, VA) |
| INSA | Intersex Society of North America (est. 1993) |
| INSA | Indian National Shipowners' Association |
| INSA | Instituto Nacional de Saúde Ricardo Jorge (Portugal) |
| INSA | International Shipowners' Association (Malaysia) |
| INSA | Inland Northwest Ski Association (Spokane, WA) |
| INSA | Indonesian National Shipowner's Association (Jakarta, Indonesia) |
| INSA | Inland Navigation Systems Analysis (USACE) |