The acronym SST may refer to:

In aircraft and naval vehicles
  • Scaled Composites SpaceShipTwo
  • SST class blimp
  • Supersonic transport (SST), civil aircraft for transporting passengers faster than the speed of sound
  • US Navy hull classification symbol for Training Submarines
In ballistics
  • Hornady SST (Super Shock Tip) bullet, with a streamlined, polymer tip
In government and military
  • Special Security Team, a counter-terrorist unit of the Japanese Coast Guard
  • Streamlined Sales Tax Project, an effort to standardize the way states in the United States tax goods
  • Swiss Solvency Test, a framework for the regulation of the insurance industry in Switzerland
  • Safe Secure Trailer, a modified 18-wheel cargo truck used by the United States Office of Secure Transportation to move specialized cargoes, such as nuclear weapons
In popular culture and media
  • Salo-Salo Together ("SST"), a defunct Philippine noontime variety show aired over GMA Network from 1993 to 1995
  • The Samoan Swat Team ("The Headshrinkers"), a professional wrestling tag team
  • Sega Superstars Tennis, a 2008 video game featuring Sega's mascots playing tennis
  • SST Band ("Sega Sound Team"), a Japanese music band
  • SST Records, an independent record label
  • Starship Traders, a multiplayer webgame
  • 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
In science and technology
  • Menter’s Shear Stress Transport, turbulence model in fluid dynamics
  • Mitsubishi SST, a concept car by Mitsubishi
  • School of Science and Technology, a magnet program within Merlo Station High School with emphasis on the sciences and technology
  • School of Science and Technology, Singapore, a Specialised Independent School in Singapore
  • 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
  • Shortest spanning tree, in graph theory
  • Silicon Storage Technology, Inc, a manufacturer of flash parts
  • Social skills training, in educational psychology training students with special needs (like autism) social skills to help with inclusion
  • Somatostatin, a peptide hormone
  • Space Surveillance Telescope, ground-based space surveillance technology developed by DARPA
  • Spitzer Space Telescope, a space observatory observing in the infrared launched in 2003
  • Steady state topography, a research methodology in cognitive neuroscience and neuromarketing
  • Structured Stream Transport, a data transport protocol still under development by MIT
  • Swedish Solar Telescope (Swedish 1-m Solar Telescope), a telescope dedicated to observing the Sun
  • Total sum of squares, SST or TSS
  • Twin Clutch SST, a twin-clutch transmission developed by Mitsubishi
In time
  • Samoa Standard Time (Samoa Time Zone)
  • Singapore Standard Time