AVR may refer to:
Railroad Allegheny Valley Railroad (1995), shortline railroad in Pennsylvania, U.S. Aroostook Valley Railroad, a defunct railroad in Maine, U.S. Assiniboine Valley Railway, a minimum gauge railway in Winnipeg, Canada Avon Valley Railway, a heritage railway in the United Kingdom
Radio Aboriginal Voices Radio, an Aboriginal Canadian national radio network Annapolis Valley Radio, a country station located in Kentville, Nova Scotia
Electronics AVR microcontrollers, a family of microcontrollers originally developed by Atmel, now part of Microchip Technology Audio/video receiver, a home theater electronic component Acronym for augmented reality and virtual reality interactive experiences Automatic voltage regulator
Other uses Armed violence reduction Aortic valve replacement Automatic voter registration Avacyn Restored AVR reactor (), a German prototype pebble bed reactor Avirulence gene, "Avr" Auxiliary Vessel, Rescue or Aircraft Vessel, Rescue Lead augmented vector right (aVR), a voltage difference in electrocardiography