ACR may refer to:

Aviation

  • IATA airport code for Araracuara Airport in Caquetá Department, Colombia
  • Aircraft Classification Rating

Medicine

  • Albumin/creatinine ratio in urine
  • ACR gene, encoding the enzyme acrosin
  • ACR score for rheumatoid arthritis
  • American College of Radiology
  • American College of Rheumatology

Places

  • Accrington railway station, UK, National Rail code

Railways

  • Alaska Central Railroad, original name of the Alaska Railroad
  • Alberta Central Railway, an historical railroad in Alberta, Canada
  • Algoma Central Railway, a railroad in Northern Ontario, Canada
  • Anglesey Central Railway, a railroad in Wales, UK

Science and technology

  • Absolute Category Rating, a subjective quality test method
  • Acumulador de Carga Rápida, a battery electric tram system
  • Adobe Camera Raw, a raw image file converter
  • Advanced CANDU reactor, a nuclear reactor
  • Advanced Communications Riser, a PC slot format
  • Advanced Contrast Ratio or Dynamic Contrast in an LCD
  • Anomalous cosmic rays, a type of cosmic rays
  • Anonymous call rejection, a voice telephone network calling feature
  • Antarctic Cold Reversal, climatic cooling about 14,500 years ago
  • Anti Cam-Out Recess, an improved Philips screwdriver
  • Attenuation-to-crosstalk ratio of communication links
  • Automatic content recognition of video
  • Automatic Circuit Recloser, a high voltage switchgear
  • Copper tubing for air conditioning and refrigeration

Military and weapons

  • AČR, Army of the Czech Republic (Armáda České republiky)
  • Adaptive Combat Rifle
  • Advanced Combat Rifle, a US Army program
  • Steyr ACR, Austrian company Steyr's entry into the program
  • AAI ACR, US Company AAI Corporation's entry into the program
  • Colt ACR, US Company Colt's entry into the program
  • Armored cavalry regiment of the US army or national guard
  • A US Navy hull classification symbol: Armored cruiser (ACR)

Other uses

  • Accelerated chart ratio, affects streaming totals in the Official Charts Company's singles chart
  • Achi language, a Mayan language of Guatemala
  • Americas Cardroom, online poker site
  • A Certain Ratio, a British post-punk band
  • Dodge Viper ACR, a car