AVR

AVR may refer to:

• Avon Valley Railway, a heritage railway in the United Kingdom
• Atmel AVR, a family of microcontrollers
• Assiniboine Valley Railway, a minimum gauge railway in Winnipeg, Canada
• Allegheny Valley Railroad, shortline railroad in Pennsylvania, U.S.
• Audio/video receiver
• Aortic valve replacement
• Automatic voltage regulator
• Video file used by certain set-top boxes which use MPEG transport stream (TS) as video codec
• AVR reactor, a German prototype pebble bed reactor
• Annapolis Valley Radio, a country station located in Kentville, Nova Scotia
• Aboriginal Voices Radio, an Aboriginal Canadian national radio network
• Armed violence reduction

aVR may refer to:

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