SAR or Sar may refer to:
Places
- Sar (river), Galicia, Spain
- Sar, Bahrain, a residential district
- Sar, Iran (disambiguation), several places in Iran
- Sar, Tibet, Tibet Autonomous Region of China
- Šar Mountains, in southeastern Europe
- Syrian Arab Republic, sometimes abbreviated as SAR
- Special administrative regions of China
Business and finance
- Parabolic SAR (stop and reverse), a method of technical stock analysis
- Saudi riyal, currency code SAR
- Stock appreciation right, an employee reward
Computing
- Segmentation and reassembly, in data networks
- Service Archive or SAR, a file format related to JAR
- Shift Arithmetically Right (SAR), an x86 instruction
- Storage Aspect Ratio of a digital image
- sar (Unix), or system activity report, a Unix/Linux performance report utility
Law enforcement
- Search and rescue
- Nationwide Suspicious Activity Reporting Initiative, US
- Suspicious activity report, by a financial institution to an authority
Science
Medicine, psychology, and biology
- Scaffold/matrix attachment region or scaffold-attachment region, DNA sequences
- Sexual Attitude Reassessment
- Specific absorption rate, of RF energy by the human body
- SAR supergroup, a clade within eukaryotes
- Structure–activity relationship, of biological effect of a molecule
- Systemic acquired resistance, of a plant to a pathogen
Science and technology
- Sar (astronomy), 9 years 5 days, a period separating eclipses
- SAR 21, Singapore Assault Rifle – 21st century
- SAR-87 (Sterling SAR-87), 1980s military assault rifle
- Sodium adsorption ratio, an irrigation water quality parameter
- Spent Acid Regeneration of sulfuric acid
- Submarine Advanced Reactor program of USS Triton
- Successive Approximation Register of a successive-approximation ADC
- Synthetic-aperture radar, imaging radar
- IPCC Second Assessment Report
- Semi-automatic rifle
Organizations
- SAR Academy, yeshiva in Riverdale, New York, US
- SAR High School, the high school of SAR Academy
- SAR Records, an American record label
- Scholars at Risk, a network supporting academic freedom
- School for Advanced Research in anthropology and related fields, Santa Fe, New Mexico, US
- Sigma Alpha Rho, a high school fraternity, Philadelphia, Pennsylvania, US
- Society for Artistic Research
- Sons of the American Revolution, US organisation
Railways
- Saudi Arabia Railways, national railway company of Saudi Arabia
- Savage Alberta Railway, Alberta, Canada, reporting mark
- South Australian Railways, 1854–1978
- South African Railways, now part of Transnet Freight Rail
Military
- Sandfontein Artillery Regiment, an artillery regiment of the South African Army
- State Artillery Regiment, an artillery regiment of the South African Army
Other uses
- Sar (surname)
- Sar, an uthra (angel) in Mandaeism
- Sar language, a Bongo–Bagirmi language of southern Chad
- Sample of Anonymised Records, based on the UK population census
- Special administrative region, territorial entity designation
- Student Aid Report, sent to applicants of U.S. federal financial aid for college
- Subject access request, in data protection law
- Super Animal Royale, a 2021 video game developed by Pixile Studios