| 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 |