SAS is a Three-Letter Acronym which may refer to:
- Scandinavian Airlines System: Scandinavian airline, with the Danish, Norwegian and Swedish governments as the largest shareholders
- Slovak Academy of Sciences
- Semester at Sea, a shipboard academic program administered by the University of Pittsburgh
- Special Air Service, a British special forces unit well-known for its counter-terrorist role
- Special Air Service (Australia), an Australian special forces unit more often employed in unconventional warfare
- Special Air Service of New Zealand (SAS NZ), a New Zealand special forces unit
- Serial Attached SCSI, a protocol and physical interface for transporting SCSI over serial links which is compatible with the SATA physical interconnect
- SAS Institute, software company
- SAS programming language
- SAS strategic methodology
- Southern All Stars, a Japanese rock band
- Society for Amateur Scientists
- Special Activities Staff, the CIA's paramilitary division.
- Space activity suit
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