ACR

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
 * 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 display
 * Copper tubing for air conditioning and refrigeration
 * 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

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
 * A US Navy hull classification symbol: Armored cruiser (ACR)

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