SAR may stand for:

• (in pharmacology and computational chemistry) structure-activity relationship
• In plant disease resistance Systemic acquired resistance
• SAR Academy, a modern Orthodox yeshiva in Riverdale, New York
• SAR High School, the high school of SAR Academy.
• Satellite Access Request
• Saudi riyal (ISO 4217 currency code SAR)
• Search and rescue
• IPCC Second Assessment Report
• Segmentation and Reassembly of data packets in a computer network
• Singapore Assault Rifle 21
• Singapore Armour Regiment
• Son of Ra, a title used by occult societies
• Sons of the American Revolution, a genealogical organization
• South African Republic
• South African Railways
• Special Administrative Region, a type of political subdivision in China
• Specific absorption rate of RF energy by the body from a cellular phone
• Successive Approximation Register, a chief component of a Successive Approximation ADC
• Suspicious activity report, filed with the US government by financial institutions
• Service Archive (.sar), a file format for the JBOSS Java application server computer program
• Synthetic Aperture Radar, an active microwave remote sensing technology
• Special Access Required for the U.S. Government Special Access Program
• Simultaneous Autoregression, used in spatial statistics and geostatistics to model discrete, correlated spatial data.
• Stock Appreciation Right
• Student Aid Report, sent to applicants of US federal financial aid for college
• the sar (System Activity Report(er)) command for UNIX and Linux which reports computer operating system activity. See "sar(1) manual page"
• Syrian Arab Republic
• Samples of Anonymised Records (SARs), output from the UK Census

Sar can refer to:

• Sar (river) in Galicia (Spain)
• Šar mountain in southeastern Europe

There is also a Saar River, which is located in the Franco-German borderlands.

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