| FIR | Fabbrica Italiana Ruote 
| Others |
| FIR | Facility Issue Reporting
| Others |
| FIR | Fact Information Report
| Others |
| FIR | Fahrner Image Replacement
| Others |
| FIR | Fairways in Regulation
| Others |
| FIR | Fairyland In Reality
| Others |
| FIR | Falling in Reverse
| Others |
| FIR | Far Infra Red
| Others |
| FIR | Far Infra-Red
| Others |
| FIR | Far InfraRed
| Others |
| FIR | Far Infrared Radiation
| Others |
| FIR | Far Infrared Ray
| Others |
| FIR | Far-InfraRed
| Others |
| FIR | Fast Incident Response
| Others |
| FIR | Fast Infra Red
| Others |
| FIR | Federation Internationale de Racketlon
| Others |
| FIR | Feline Interaction Robot
| Others |
| FIR | Field Interrogation Reports
| Others |
| FIR | Field Investigation Research
| Others |
| FIR | Field Issuance Remodel
| Others |
| FIR | File Intermediate Representation
| Others |
| FIR | Final Information Report
| Others |
| FIR | Final Inspection Report
| Others |
| FIR | Financial Information Return
| Others |
| FIR | Finite Impulse Response
| Others |
| FIR | Fire and Insect Resiliency
| Others |
| FIR | First Information Report
| Crime, Legal |
| FIR | First-Impressions Report
| Others |
| FIR | Fix It Right
| Others |
| FIR | Flats Industrial Railroad
| Others |
| FIR | Flats Industrial Railroad Company
| Others |
| FIR | Flexible Initiatives Resourcing
| Others |
| FIR | Flight Information Region
| Transport, Air Transport, Airport |
| FIR | For Immediate Release
| Others |
| FIR | Force Information Room
| Others |
| FIR | Ford Internal Reference Number
| Others |
| FIR | Formal Identification Report
| Others |
| FIR | Fortune International Realty
| Others |
| FIR | Forum Isiyo Rasmi
| Others |
| FIR | Forumul Inventatorilor Romani
| Others |
| FIR | Foundation for the Investigation of Reality
| Others |
| FIR | Friendly Interactive Ruby
| Others |
| FIR | Front Inside Right
| Others |
| FIR | Frontiers in Reproduction
| Others |
| FIR | Fuel Indicating Reading
| Others |
| FIR | Fuel Indicator Reading
| Others |
| FIR | Full Intra Request
| Others |