BST is a three letter acronym that may refer to:

Time zones

• Bangladesh Standard Time, the time zone for Bangladesh
• British Summer Time, known as British Standard Time between 1968 and 1971

Science, computing and mathematics

• Bibliographic style file (.bst), used with BibTeX
• Binary search tree, a data structure
• Browser-side templating, a templating strategy for web applications
• Biochemical Society Transactions, the transactions journal of the Biochemical Society
• Biochemical systems theory, a mathematical modelling framework for biochemical systems, based on ordinary differential equations
• Bovine somatotropin, a type of growth hormone

Other

• Basic Safety Training, training in basic firefighting, personal survival, personal safety and social responsibility, and elementary first aid
• Bituminous surface treatment, a sealing coat for pavements
• Bost Airport (IATA airport code), an airport along the Helmand River in Afghanistan

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