FIR

A fir is a type of evergreen coniferous tree.

Fir, FIR or F.I.R. may also refer to:

Entertainment

 * F.I.R., a Taiwanese pop music group
 * F.I.R. (album)
 * F. I. R. (1999 film), an Indian Malayalam-language action film
 * FIR (2022 film), an Indian Tamil-language action thriller film
 * F.I.R. (TV series), an Indian sitcom
 * Falling in Reverse, an American rock band
 * FIR (2021 film), an Indian Bengali-language crime thriller film

Science and technology

 * Far infrared
 * Finite impulse response
 * Free ideal ring
 * Flight information region
 * FiR 1, the first nuclear reactor in Finland
 * Research Institute for Operations Management (Forschungsinstitut für Rationalisierung), in Germany

Other uses

 * Fir, an alternative spelling of Fier, a city in Albania
 * Firan language (ISO 639-3 language code: fir)
 * First information report, a police document in some countries
 * Flats Industrial Railroad, a former US company
 * International Federation of Resistance Fighters – Association of Anti-Fascists (FIR Fédération Internationale des Résistantes – Association des Antifascistes)
 * Italian Rugby Federation (Federazione Italiana Rugby)
 * USCGC Fir, 2 US Coast Guard ships