ACR may refer to: Medicine Albumin/creatinine ratio in urine ACR score for rheumatoid arthritis ACR gene, encoding the enzyme acrosin American College of Radiology American College of Rheumatology Places Accrington railway station, UK, National Rail code Araracuara Airport, Colombia, IATA code Science and technology Absolute Category Rating, a subjective quality test method Acumulador de Carga Rápida, a battery electric tram system Advanced CANDU reactor, a nuclear reactor Advanced Communications Riser, a PC slot format Advanced Contrast Ratio or Dynamic Contrast in an LCD display Copper tubing for air conditioning and refrigeration Antarctic Cold Reversal, climatic cooling about 14,500 years ago Attenuation-to-crosstalk ratio of communication links Automatic content recognition of video Adobe Camera Raw, a raw image file converter Military and weapons Adaptive Combat Rifle Advanced Combat Rifle, a US Army program Armored cavalry regiment of the US army or national guard AČR, Army of the Czech Republic (Armáda České republiky) Steyr ACR, an Austrian assault rifle Other uses A Certain Ratio, a British post-punk band 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 Dodge Viper ACR, a car