ASR may refer to: Military Hull classification symbol for submarine rescue ship in some navies U.S. Army Service Ribbon Organizations and publications ASR Nederland, a Dutch insurance company Academy at Swift River Erkilet International Airport, Turkey, IATA code Science Ancestral sequence reconstruction, to infer ancient DNA sequences Acute stress reaction to traumatic event Adult sex ratio of males to females Alkali–silica reaction, affecting sensitive aggregates and causing concrete expansion and failure Analyte-specific reagent, a class of biological molecules Asian soybean rust, a plant disease Age-Standardized Rates of a phenomenon in a series of populations. Technology Automatic speech recognition Automotive shredder residue, of shredded automobiles Aquifer storage and recovery, of potable water in an aquifer Airport surveillance radar Asr (radar), an Iranian radar system Arithmetic shift right, a computer instruction Answer-seizure ratio, the percentage of telephone calls that are answered Traction control system, from German Antriebsschlupfregelung (Acceleration Slip Regulation), system to prevent loss of traction on vehicles Automatic Send Receive on a teletype Teletype ASR 33, a specific model teletype, commonly used for early day minicomputers Architecturally Significant Requirements Software Apple Software Restore, a command line utility in Mac OS X Automated system recovery, a Microsoft Windows XP function Transport Air-sea rescue State Railway of Thailand ASR class Other uses Asr, the daily afternoon prayer in Islam Accelerated share repurchase, whereby companies buy back shares