| Acronym | Definition |
|---|
| IRSN➣Institut de Radioprotection et de Sûreté Nucléaire (French: Institute for Radioprotection and Nuclear Safety) |
| IRSN➣Information Retrieval in Sensor Networks |
| IRSN➣International Road Safety News |
| IRSN➣International Republican Socialist Network (political group) |
| IRSN➣Internal Revenue Service Number (US IRS) |
| IRSN➣International Relations Student Network |