Sas or SAS may refer to:

Military

• Special Air Service, the principal special forces unit of the British Army
• Australian Special Air Service Regiment, Australian regiment derived from the British Army regiment
• New Zealand Special Air Service (NZ SAS), New Zealand regiment derived from the British Army regiment
• French SAS: Predecessor units of the French Army's 1st Naval Infantry Parachute Regiment (1er RPIMa):
• The two regiments of the original Special Air Service formed from Free French soldiers
• 3e Regiment de chasseurs parachutistes (3e RCP), also known as 3 SAS.
• 2e Regiment de chasseurs parachutistes (2e RCP), also known as 4 SAS. (note the 'inconsistent' numbering).
• 1st Colonial Demi-Brigade of SAS Parachute Commandos (1ere Demi-Brigade Coloniale de commandos parachutistes SAS) Dec 1947 - Feb 1955
• Belgian SAS: unit formed from the Belgian Independent Parachute Coy., also known as the Belgian Sqn., or, later, 5 SAS.
• Canadian SAS: short-lived post-war Company (not Squadron), 1946-1948; never operational.
• Rhodesian Special Air Service (Disbanded)
• Su Altı Savunma, a special operations unit of the Turkish Navy

History

• Sas coat-of-arms, a Polish coat of arms
• Sas of Moldavia, a Voivode ruling over the lands of what was to become Moldavia between 1354-1358

Science and technology

Nuclear Technology

• SAS, Safety Analysis System, a computer code developed in Argonne National Laboratory

Astronomy and space exploration

• Small Astronomy Satellite, a series of NASA satellites
• Uhuru (satellite), also known as SAS-1
• SAS-2, or Second Small Astronomy Satellite
• SAS-3, or Third Small Astronomy Satellite
• Space activity suit, a spacesuit which provides mechanical pressure by means of elastic garments
• Space adaptation syndrome, an illness akin to motion sickness experienced by many first-time space travelers

Computer science

• SAS System, a software package used for statistical analysis, among other things
• Secure Attention Sequence or secure attention key, a method to invoke a computer operating system's attention, usually signaling it to show the log on screen
• Serial Attached SCSI, a computer bus technology primarily designed for the transfer of data to and from storage devices and drives, e.g. hard disks
• Spatially Aware Sublayer, an optional sublayer of the MAC that provides spatial reuse in Resilient Packet Ring

Other

• Sleep apnea syndrome
• Slot Accounting System (SAS) protocol, a slot machine communication method created by the International Game Technology (IGT) corporation
• Small-angle scattering (SAS), a scattering technique based on the deflection of a beam of particles away from the straight trajectory after it interacts with a sample
• Solvent-accessible surface or accessible surface area, the surface area of a biomolecule (protein, DNA, etc.) that is accessible to a solvent
• Subarachnoid space, the space between the arachnoid mater and pia mater in the brain
• Synthetic aperture sonar, a form of sonar in which sophisticated post-processing of sonar data are used in ways closely analogous to synthetic aperture radar

Academics

• School of Advanced Study, a listed organization of the University of London with ten member institutes
• School for Advanced Studies, a dual-enrollment high school program in Miami, Fl
• Semester at Sea, a shipboard academic program administered by the University of Virginia
• Sekolah Alam Shah, a premier boarding school in Malaysia
• Shanghai American School, an international school in Shanghai
• Singapore American School, an international school in Singapore
• Slovak Academy of Sciences, the main scientific and research institution in Slovakia fostering basic and strategic basic research
• Society for Amateur Scientists, an American organisation
• Space Access Society, an organization dedicated to increasing the viability and reducing the cost of commercial access to space travel
• Studia Academica Slovaca, a summer school teaching the Slovak language
• Society for Animation Studies, an international scholarly organisation
• St. Augustine's School, a school in Kalimpong, West Bengal, India
• Strong American Schools, the nonprofit running "ED in 08," an information and advocacy campaign aimed at brining education reform to the forefront of the 2008 presidential candidates' campaign policies
• Sussex Archaeological Society

Business

• SAS (TV station), a television station in Adelaide, South Australia
• SAS Institute Inc., a software company
• SAS Group, Scandinavian Airlines System Group, an airline and hotel company in Europe, based in Stockholm, Sweden
• Scandinavian Airlines System, an airline company in Denmark, Norway and Sweden
• Radisson Hotels, branded Radisson SAS in parts of Europe, Africa, and Asia
• SAS Cargo Group, a cargo company in North Europe
• SAS Shoemakers, a shoe company
• Société par actions simplifiée, a type of French limited company
• Statements on Auditing Standards, a series of internationally recognized auditing standards
• Statement on Auditing Standards No. 70: Service Organizations or SAS 70, defines the professional standards used by a service auditor
• Statement on Auditing Standards No. 99: Consideration of Fraud or SAS 99, defines the professional standards used by auditors in relation to fraud
• Surfers Against Sewage, UK-based environmental campaign group

Music

• S.A.S. (rap duo), members of The Diplomats
• Southern All Stars, a Japanese rock band
• Stubborn All-Stars, a ska band from New York
• Stretch Arm Strong, a band from South Carolina

Transport

• Second Avenue Subway, a new subway line in New York City
• The IATA airport code for Salton Sea Airport
• Scandinavian Airlines System, an airline serving the Nordic States

Other

• Scottish Ambulance Service
• SAS (Action Force), a fictional military unit in the Action Force universe
• Self-anchored suspension bridge, a suspension bridge in which the main cables do not attach to the ground via large anchorages
• Side-Angle-Side, a formula used to prove the congruence of triangles
• Surplus activated sludge, a process in sewage treatment in which air or oxygen is forced into sewage liquor to develop a biological floc
• SAS, a spy novel series by Gérard de Villiers