FIR

• F. I. R. (1999 film)
• F.I.R No. 339/07/06
• F.I.R.
• F.I.R. (TV series)
• F.I.R. (album)
• FIR (2022 film)
• FIRS (disambiguation)
• Falling in Reverse
• Far infrared
• FiR 1
• Fier
• Finite impulse response
• Firan language
• First information report
• Flats Industrial Railroad
• Flight information region
• Free ideal ring
• International Federation of Resistance Fighters – Association of Anti-Fascists
• Italian Rugby Federation
• Research Institute for Operations Management
• The Firs (disambiguation)
• USCGC Fir