• (in taxonomy) a proposed supergroup containing the Chromalveolata and the Rhizaria, standing for the three largest groups within these: (Stramenopiles, Alveolata, Rhizaria)
• (in microbiology) A naming convention for uncultured bacteria first found in the Sargasso Sea (see SAR11)
• (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
• SAR Records, a record label
• IPCC Second Assessment Report
• Saudi riyal (ISO 4217 currency code SAR)
• Scholars At Risk
• Search and Replace, a feature of text editors
• Search and rescue
• Seasonal allergic rhinitis
• Segmentation and Reassembly of data packets in a computer network
• Singapore Assault Rifle 21
• Service Archive (.sar), a file format for the JBOSS Java application server computer program
• Sigma Alpha Rho( High School Fraternity)
• Sodium Adsorption Ratio
• Son of Ra, a title used by occult societies
• Sons of the American Revolution, a genealogically-based community service organization
• South African Republic
• South African Railways
• South Australian Railways
• Special Administrative Region, a type of political subdivision in China
• Specific absorption rate of RF energy by the body from a cellular phone
• Sulfuric Acid Recovery (or Regeneration), a common hydrocarbon processing application
• Suspicious activity report, filed with the US government by financial institutions
• Structure-activity relationship, used in medicinal chemistry.
• Stock Appreciation Right
• Student Aid Report, sent to applicants of US federal financial aid for college
• Synthetic Aperture Radar, an active microwave remote sensing technology
• Syrian Arab Republic

Sar can refer to:

Places

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

People

• Edwin van der Sar, a Dutch soccer goalkeeper currently playing for Manchester United.

See also

• Saar