OST

• Original soundtrack, recorded sound accompanying a production such as a film
• O.S.T., an alias of electronic musician Chris Douglas
• O.S.T. (album), by the People Under the Stairs
• OS/T (album) by S-type

• Object Storage Target in computing, used by the Lustre file system an others
• Oligosaccharyltransferase, an enzyme
• Open-space technology, for organising meetings
• Open Systems Theory, a form of sociotechnical systems pioneered by Fred Emery
• Orbit stabiliser theorem in mathematics
• Offline Storage Table, a Microsoft file format
• OST Family (organic solute transporter) of genes
• Origins Space Telescope, a space telescope mission
• Open Source Threat, any software demonstrating a device vulnerability that is open-source

• Office of Science and Technology, a British government agency
• Office of Secure Transportation, a US government agency
• Order of the Solar Temple, French esoteric cult
• Organisation Socialiste des Travailleurs, the Socialist Workers Organisation of Senegal
• Outer Space Treaty, a treaty regulating international law in outer space.

• Ostend–Bruges International Airport, Belgium, IATA code
• Old Spanish Trail (auto trail)

• Ost (surname)

{{disambiguation}}