FST may refer to:
Arts and entertainment Finlands Svenska Television, now Yle Fem, the Swedish-language department of the Finnish Broadcasting Company Florida Studio Theatre, in Sarasota, Florida, United States Free Southern Theater, in Mississippi, United States
Biology Fixation index (FST), in population genetics Follistatin, a mammalian glycoprotein (and gene) Forced swim test, in animal behavioral studies
Education Franciscan School of Theology, in California, United States French School of Thessaloniki, in Greece The interdisciplinary field of food science and technology
Government and politics Fermanagh and South Tyrone (Assembly constituency), in Northern Ireland Fermanagh and South Tyrone (UK Parliament constituency), in Northern Ireland Financial Secretary to the Treasury, of the United Kingdom Foreign Sports Talent Scheme, of Singapore
Military Fire Support Team of the Royal Artillery Fleet Survey Team of the United States Navy Forward surgical teams of the United States Army
Technology Feature Selection Toolbox, machine learning software File Streaming Technology, a digital audio format Finite-state transducer Full-Scale Tunnel, a demolished NASA wind tunnel
Transport Fenchurch Street railway station, in London First Stop Travel, a Scottish bus operator Fort Stockton–Pecos County Airport, in Texas, United States Sint-Truiden railway station, in Belgium
Other uses Family Survival Trust, in the United Kingdom Foundation for Science and Technology, in the United Kingdom Field sobriety testing Fiji Standard Time