OST

OST may refer to:

Music

• Open Source Track, a licensing and distribution model for music initiative
• O.S.T., an alias of electronic musician Chris Douglas
• O.S.T. (album), the third album by the People Under the Stairs
• OST, an abbreviation for Original Soundtrack

Science and technology

• Object Storage Target, an interface to a single exported backend volume of an Object Storage Server (OSS); used by the Lustre file system, among others
• Oligosaccharyltransferase, an enzyme
• Open-space technology, an approach for meetings or other events
• Orbit stabiliser theorem, a theorem of group theory in mathematics
• Opiate substitution treatment, a treatment therapy for those addicted to opiates
• Offline Storage Table, a file format for Microsoft Outlook

Organizations

• Office of Science and Technology, a British government agency
• Office of Secure Transportation, a US government agency
• Office of the Secretary of Transportation, the lead office of the United States Department of Transportation
• Order of St. Thomas, a religious order in the Liberal Catholic Tradition
• Ordo Sanctissimae Trinitatis (Order of the Holy Trinity) or the Trinitarian Order, a Catholic religious order
• Organisation Socialiste des Travailleurs, the Socialist Workers Organisation of Senegal

Places

• Ostend-Bruges International Airport in Belgium
• Old Spanish Trail (disambiguation)

Other uses

• Ost (surname)
• Outer Space Treaty, an international treaty governing the activities of states in the exploration and use of outer space
• Original Star Trek