FIRS
| Acronym | Definition |
|---|---|
| FIRS | Federal Information Relay Service |
| FIRS | Fédération Internationale de Roller Sports (French: International Roller Sports Federation) |
| FIRS | Federation Internationale de Roller Skating |
| FIRS | Federal Inland Revenue Services (Nigeria) |
| FIRS | Far-Infrared Sauna |
| FIRS | Fingerprint Identification Records System (US FBI) |
| FIRS | Fonds d'Intervention et de Régularisation des Marchés du Sucre (French: Intervention Fund and Regulation of Sugar Markets) |
| FIRS | Far Infrared Survey |