SAS or Sas may refer to:

• Special Air Service, a special forces unit of the British Army
• Special Air Service Regiment, a special forces unit of the Australian Army
• 5th Special Air Service, a Belgian Second World War formation
• Canadian Special Air Service Company, 1947–1949
• 1st Marine Infantry Parachute Regiment, sometimes referred to as the "French SAS"
• New Zealand Special Air Service, a special forces unit of the New Zealand Army
• Rhodesian Special Air Service, several special forces units from Rhodesia
• Special Air Service, a unit within the Special Forces of Zimbabwe
• South African Ship, the South African Navy warship prefix
• Specialized Administrative Sections, a French civil-military program during the Algerian War
• Underwater Defence (Turkish Armed Forces) (Su Altı Savunma), a unit of the Turkish Navy

• SAS (TV station), in Adelaide, South Australia
• SAS: Are You Tough Enough?, a British documentary series 2002–2004
• SAS: Red Notice, a 2021 action thriller film
• SAS: Rogue Heroes, a 2022 British historical drama TV series
• SAS: Who Dares Wins, a 2015 British reality TV series

• SAS (novel series), by Gérard de Villiers, 1965–2013
• Southern All Stars, a Japanese rock band
• Strong Arm Steady, an American hip hop group from California
• SAS: Secure Tomorrow, a 2008 video game

• SAS Group, Swedish airline holding company
  • Scandinavian Airlines, stylized as SAS
• SAS Institute, American developer of analytics and AI software
• SAS (shoemakers), American shoe manufacturer
• SAS (TV station), in Adelaide, South Australia
• Société par actions simplifiée, a French type of business entity
• Andalusian Health Service (Servicio Andaluz de Salud), in Spain
• Scottish Ambulance Service, part of NHS Scotland

• Sultan Alam Shah School, in Malaysia
• Shanghai American School, in Shanghai
• Singapore American School, in Singapore

• Sankt-Ansgar-Schule, in Hamburg, Germany
• School of Advanced Study, of the University of London, England
• Slovak Academy of Sciences, the main scientific and research institution in Slovakia
• Studia Academica Slovaca, in Bratislava, Slovakia

• Saint Andrew's School (Florida)
• Saint Andrew's School (Georgia)
• School for Advanced Studies, in Miami, Florida
• Semester at Sea, a shipboard academic program

• Second Amendment Sisters, United States women's gun rights advocacy group
• Servants Anonymous Society, a nonprofit women's organization
• Freedom and Solidarity (Sloboda a Solidarita), a political party in Slovakia
• Society for Amateur Scientists, an American non-profit organization
• Society for Animation Studies, an international scholarly organization
• Space Access Society, for increasing access to space travel
• Strong American Schools, an American non-profit organization that promotes sound education policies
• Surfers Against Sewage, a British marine conservation charity
• Sussex Archaeological Society, inn England

• Éva Sas (born 1970), French politician
• Ferenc Sas (1915–1988), Hungarian footballer
• Hasan Şaş (born 1976), Turkish footballer
• Julian Sas (born 1970), Dutch guitarist, singer and songwriter
• Sas of Moldavia (died 1358), voivode of Moldavia 1354–1358

• Šas, Montenegro
• Sas, Iran, or Eslamabad
• Sas van Gent, Netherlands
• Sas, a tributary of the river Bouleț in Romania

• Space adaptation syndrome, or space sickness
• Subvalvular aortic stenosis (canine), a heart murmur in dogs
• Syndesmotic ankle sprain, a type of ankle sprain

• SAS (software), a statistical software suite developed by SAS Institute
• SAS language, a computer programming language
• Secure attention key or secure attention sequence, a key combination pressed before a login screen
• Serial Attached SCSI, a point-to-point serial protocol
• Short Authentication String, a method used in the ZRTP cryptographic protocol
• Sorcerer's Apprentice syndrome, a network protocol flaw in TFTP
• Spatially aware sublayer, in Resilient Packet Ring

• Small Astronomy Satellite (disambiguation), one of three of NASA-operated space telescopes
• Space activity suit, or mechanical counterpressure suit
• Sistema Avariynogo Spaseniya, the Soyuz launch escape system

• Self-anchored suspension bridge
• Side-angle-side, a concept in geometry for determining congruence or similarity of triangles
• Small-angle scattering, a scattering technique based on the deflection of a beam of particles away from the straight trajectory
• Stability augmentation system, a type of automatic flight control system
• Synthetic aperture sonar
• Supercritical Anti-Solvent, a method used for micronization of substances

• San Antonio Spurs, a basketball team in San Antonio, Texas, United States
• SAS Championship, a golf tournament on the PGA Tour Champions
• Stars Association for Sports, a women's football club in Aley, Lebanon

• Salton Sea Airport, U.S., IATA airport code SAS
• Sam Shing stop, Hong Kong, MTR station code SAS
• San Antonio station (Texas), U.S., Amtrak code SAS
• Second Avenue Subway, New York City, U.S.
• St Annes-on-the-Sea railway station, England, station code SAS

• Sas coat of arms, a central European coat of arms
• Statements on auditing standards, a series of internationally recognized auditing standards

• All pages with titles beginning with SAS
• History of the SAS (disambiguation)
• Saas (disambiguation)
• Sass (disambiguation)