SAS
- 1st Marine Infantry Parachute Regiment
- 5th Special Air Service
- Andalusian Health Service
- Bouleț
- Canadian Special Air Service Company
- Ferenc Sas
- Freedom and Solidarity
- Hasan Şaş
- History of the SAS (disambiguation)
- Julian Sas
- New Zealand Special Air Service
- Resilient Packet Ring
- Rhodesian Special Air Service
- SA (disambiguation)
- SAS (TV station)
- SAS (novel series)
- SAS (shoemakers)
- SAS (software)
- SAS Championship
- SAS Group
- SAS Institute
- SAS language
- SASES
- Saas (disambiguation)
- Saint Andrew's School (Florida)
- Saint Andrew's School (Georgia)
- Salton Sea Airport
- Sam Shing stop
- San Antonio Spurs
- San Antonio station (Texas)
- Sankt-Ansgar-Schule
- Sas coat of arms
- Sas of Moldavia
- Sas van Gent
- Sas, Iran
- Sases
- Sass (disambiguation)
- Scandinavian Airlines
- School for Advanced Studies
- School of Advanced Study
- Scottish Ambulance Service
- Second Amendment Sisters
- Second Avenue Subway
- Secure attention key
- Self-anchored suspension bridge
- Semester at Sea
- Serial Attached SCSI
- Servants Anonymous Society
- Shanghai American School
- Short Authentication String
- Side-angle-side
- Singapore American School
- Slovak Academy of Sciences
- Small Astronomy Satellite (disambiguation)
- Small-angle scattering
- Society for Amateur Scientists
- Society for Animation Studies
- Société par actions simplifiée
- Sorcerer's Apprentice syndrome
- South African Navy
- Southern All Stars
- Space Access Society
- Space activity suit
- Space adaptation syndrome
- Special Air Service
- Special Air Service Regiment
- Special Forces of Zimbabwe
- Specialist, associate specialist and specialty doctors
- Specialized Administrative Sections
- St Annes-on-the-Sea railway station
- Stability augmentation system
- Stars Association for Sports
- Statements on auditing standards
- Strong American Schools
- Strong Arm Steady
- Studia Academica Slovaca
- Subvalvular aortic stenosis (canine)
- Sultan Alam Shah School
- Surfers Against Sewage
- Surrey Archaeological Society
- Sussex Archaeological Society
- Syndesmotic ankle sprain
- Synthetic aperture sonar
- Underwater Defence (Turkish Armed Forces)
- Éva Sas
- Šas