ACR

• 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