SST

The acronym SST may refer to:

;in aircraft and naval vehicles
*Supersonic transport (SST), civil aircraft for transporting passengers faster than the speed of sound.
*US Navy hull classification symbol for Training Submarines
*Scaled Composites SpaceShipTwo

;in popular culture and media
*SST Records, an independent record label
*Sega Sound Team, a Japanese music band.
*Starship Troopers, a science fiction book by Robert A. Heinlein
*Starship Troopers (film), a film loosely based on the book by Robert A. Heinlein of the same name
*Starship Traders, a multiplayer webgame.
*The Samoan Swat Team, a professional wrestling tag team.
*Salo-Salo Together (SST), a defunct Philippine noontime variety show aired over GMA Network from 1993 to 1995.

;in science and technology
* School of Science and Technology, a magnet program within Merlo Station High School with emphasis on the sciences and technology
* Sea surface temperature
* Serum-separating tube, a particular type of evacuated tube used during venipuncture.
* Shiva Smart Tunneling, a simple VPN tunneling protocol in Eicon Shiva series VPN gateway products.
* Silicon Storage Technology, Inc, a manufacturer of flash parts
* Somatostatin, a peptide hormone
* Spitzer Space Telescope, a space observatory observing in the infrared launched in 2003.
* Statistical Software Tools, a program by Dubin/Rivers Research
* Swedish Solar Telescope, a telescope dedicated to observing the Sun.
* Mitsubishi SST, a concept car by Mitsubishi
* Twin Clutch SST, a twin-clutch transmission developed by Mitsubishi

;in other uses
*Sega Superstar Tennis a 2008 video game featuring Sega's mascots playing tennis
*The Streamlined Sales Tax Project, a national effort to standardize the way states tax goods.
*Singapore Standard Time
*SubSystem Test, a management message in SCCP layer in SS7
*Special Security Team, a group within the Japanese Coast Guard.
* Swiss Solvency Test, a system to determine capital needs of insurance companies.
* The Safe Secure Trailer is a modified 18-wheel cargo truck used by the United States Office of Secure Transportation to move specialized cargoes, such as nuclear weapons.
* In fluid transport, the Shear Stress Transport model