FIR refer to: Finite impulse response, a digital filter type Forschungsinstitut für Rationalisierung, the Research Institute for Operations Management in English French Indian rupee, defunct currency in French India far infrared, infrared radiation of long wave length (>15-30 µm), far from visible region In India and Pakistan, First Information Report, the first report of crime filed by police F.I.R. (First Information Report)'s a weekly comedy TV series that airs on SAB TV in In… (More on Fir)