IAR

IAR may refer to:
 * IAR Systems, an embedded system technology company
 * The Institute of Audio Research
 * The Institute of Asian Research, an institute under the Faculty of Arts in the University of British Columbia, Vancouver, BC, Canada
 * "Ignore all rules", a policy on Wikipedia
 * Industria Aeronautică Română (IAR Braşov), an aerospace manufacturer
 * M27 Infantry Automatic Rifle, the primary service rifle/automatic rifle issued to U.S. Marine Corps infantry units
 * Institute of Advanced Research, a private university in Gujarat, India
 * Instruction address register, an alternative name for the program counter CPU register
 * International Authority for the Ruhr, an organization in control of the industry in the Ruhr area from 1949 to 1952
 * International Affairs Review, an academic journal in the field of international affairs
 * Informacyjna Agencja Radiowa, a Polish news agency


 * The IATA code for the Tunoshna Airport, Yaroslavl Oblast, Russia
 * .iar, Inventory ARchive file used for avatar inventory backup in OpenSimulator virtual environments
 * Investment Adviser Representative employed by a registered investment adviser, a firm that is an investment adviser in the United States
 * The Illinois Assessment of Readiness