FST

FST may refer to:

• Fenchurch Street railway station (from the National Rail code)
• Fermanagh and South Tyrone (Assembly constituency)
• Fermanagh and South Tyrone (UK Parliament constituency)
• Field Sobriety Test
• File Streaming Technology, Alesis' proprietary file format for the HD24 digital multitrack
• Financial Secretary to the Treasury, a junior Ministerial position within HM Treasury
• Finite state transducer, also known as a Mealy machine, a type of Finite state machine
• Finlands Svenska Television (FST5), the Swedish language department of the Finnish Broadcasting Company
• Fire Support Team, a sub-unit of the Royal Artillery
• Fixation index (F_ST), a measure of population differentiation
• Follistatin, a protein, an antagonist of activin
• Forward Surgical Teams, US Army mobile medical units
• Franciscan School of Theology
• Fiber Splice Tray, a mechanical closure that fiber optic fusion and mechanical splices are placed in. FST are designed to provide a location to store and to protect the fiber cables and the splices.