IVR is a three-letter abbreviation that may refer to: Accelerated idioventricular rhythm Interactive voice response International Association for Philosophy of Law and Social Philosophy Interventional radiology Inter-VSAN Routing Immersive virtual reality Integrated voltage regulator International vehicle registration code Intramolecular Vibrational Energy Redistribution .ivr, a video file format ("Internet Video Recording") used by recent RealPlayer programs Inverell Airport, IATA airport code "IVR" Iver railway station, Buckinghamshire, England; National Rail station code "IVR"