AVR

Railroad

• Allegheny Valley Railroad, 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
• Automatic Volume Recognition in OS/360 and successors

Other uses

• Armed violence reduction
• Aortic valve replacement
• Automatic Voter Registration
• Avacyn Restored
• Aviator, a pilot of an airplane or other heavier-than-air aircraft
• AVR reactor (Arbeitsgemeinschaft Versuchsreaktor), a German prototype pebble bed reactor
• .avr (audio-visual research), video file format used by certain set-top boxes which use MPEG transport stream (TS) as video codec

aVR may refer to:

• Lead augmented vector right (aVR), a voltage difference in electrocardiography